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
  44 #include "lttngtoptypes.h"
  45 #include "cputop.h"
  46 #include "iostreamtop.h"
  47 #include "cursesdisplay.h"
  48 #include "common.h"
  49
  50 #define DEFAULT_FILE_ARRAY_SIZE 1
  51
  52 const char *opt_input_path;
  53
  54 struct lttngtop *copy;
  55 pthread_t display_thread;
  56 pthread_t timer_thread;
  57
  58 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  59 unsigned long last_display_update = 0;
  60 int quit = 0;
  61
  62 /* LIVE */
  63 /* list of FDs available for being read with snapshots */
  64 struct mmap_stream_list mmap_list;
  65 GPtrArray *lttng_consumer_stream_array;
  66 int sessiond_metadata, consumerd_metadata;
  67 struct lttng_consumer_local_data *ctx = NULL;
  68 /* list of snapshots currently not consumed */
  69 GPtrArray *available_snapshots;
  70 sem_t metadata_available;
  71 FILE *metadata_fp;
  72 int trace_opened = 0;
  73 int metadata_ready = 0;
  74
  75 enum {
  76         OPT_NONE = 0,
  77         OPT_HELP,
  78         OPT_LIST,
  79         OPT_VERBOSE,
  80         OPT_DEBUG,
  81         OPT_NAMES,
  82 };
  83
  84 static struct poptOption long_options[] = {
  85         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  86         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  87         { NULL, 0, 0, NULL, 0, NULL, NULL },
  88 };
  89
  90 void *refresh_thread(void *p)
  91 {
  92         while (1) {
  93                 if (quit)
  94                         return NULL;
  95                 sem_wait(&pause_sem);
  96                 sem_post(&pause_sem);
  97                 sem_post(&timer);
  98                 sleep(refresh_display/NSEC_PER_SEC);
  99         }
 100 }
 101
 102 void *ncurses_display(void *p)
 103 {
 104         unsigned int current_display_index = 0;
 105
 106         sem_wait(&bootstrap);
 107         /*
 108          * Prevent the 1 second delay when we hit ESC
 109          */
 110         ESCDELAY = 0;
 111         init_ncurses();
 112
 113         while (1) {
 114                 sem_wait(&timer);
 115                 sem_wait(&goodtodisplay);
 116                 sem_wait(&pause_sem);
 117
 118                 copy = g_ptr_array_index(copies, current_display_index);
 119                 assert(copy);
 120                 display(current_display_index++);
 121
 122                 sem_post(&goodtoupdate);
 123                 sem_post(&pause_sem);
 124
 125                 if (quit) {
 126                         reset_ncurses();
 127                         pthread_exit(0);
 128                 }
 129         }
 130 }
 131
 132 /*
 133  * hook on each event to check the timestamp and refresh the display if
 134  * necessary
 135  */
 136 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 137 {
 138         unsigned long timestamp;
 139
 140         timestamp = bt_ctf_get_real_timestamp(call_data);
 141         if (timestamp == -1ULL)
 142                 goto error;
 143
 144         if (last_display_update == 0)
 145                 last_display_update = timestamp;
 146
 147         if (timestamp - last_display_update >= refresh_display) {
 148                 sem_wait(&goodtoupdate);
 149                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 150                                         timestamp));
 151                 sem_post(&goodtodisplay);
 152                 sem_post(&bootstrap);
 153                 last_display_update = timestamp;
 154         }
 155         return BT_CB_OK;
 156
 157 error:
 158         fprintf(stderr, "check_timestamp callback error\n");
 159         return BT_CB_ERROR_STOP;
 160 }
 161
 162 /*
 163  * get_perf_counter : get or create and return a perf_counter struct for
 164  * either a process or a cpu (only one of the 2 parameters mandatory)
 165  */
 166 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 167                 struct cputime *cpu)
 168 {
 169         struct perfcounter *ret;
 170         GHashTable *table;
 171
 172         if (proc)
 173                 table = proc->perf;
 174         else if (cpu)
 175                 table = cpu->perf;
 176         else
 177                 goto error;
 178
 179         ret = g_hash_table_lookup(table, (gpointer) name);
 180         if (ret)
 181                 goto end;
 182
 183         ret = g_new0(struct perfcounter, 1);
 184         /* by default, make it visible in the UI */
 185         ret->visible = 1;
 186         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 187
 188 end:
 189         return ret;
 190
 191 error:
 192         return NULL;
 193 }
 194
 195 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 196                 const char *name, int value)
 197 {
 198         struct perfcounter *cpu_perf, *process_perf;
 199
 200         cpu_perf = get_perf_counter(name, NULL, cpu);
 201         if (cpu_perf->count < value) {
 202                 process_perf = get_perf_counter(name, proc, NULL);
 203                 process_perf->count += value - cpu_perf->count;
 204                 cpu_perf->count = value;
 205         }
 206 }
 207
 208 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 209                 const struct bt_definition *scope,
 210                 struct processtop *proc,
 211                 struct cputime *cpu)
 212 {
 213         struct bt_definition const * const *list = NULL;
 214         const struct bt_definition *field;
 215         unsigned int count;
 216         struct perfcounter *perfcounter;
 217         GHashTableIter iter;
 218         gpointer key;
 219         int ret;
 220
 221         if (!scope)
 222                 goto end;
 223
 224         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 225         if (ret < 0)
 226                 goto end;
 227
 228         if (count == 0)
 229                 goto end;
 230
 231         g_hash_table_iter_init(&iter, global_perf_liszt);
 232         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 233                 field = bt_ctf_get_field(event, scope, (char *) key);
 234                 if (field) {
 235                         int value = bt_ctf_get_uint64(field);
 236                         if (bt_ctf_field_get_error())
 237                                 continue;
 238                         update_perf_value(proc, cpu, (char *) key, value);
 239                 }
 240         }
 241
 242 end:
 243         return;
 244 }
 245
 246 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 247 {
 248         struct cputime *cpu;
 249         const struct bt_definition *scope;
 250
 251         cpu = get_cpu(get_cpu_id(event));
 252
 253         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 254         extract_perf_counter_scope(event, scope, proc, cpu);
 255
 256         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 257         extract_perf_counter_scope(event, scope, proc, cpu);
 258
 259         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 260         extract_perf_counter_scope(event, scope, proc, cpu);
 261 }
 262
 263 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 264                 void *private_data)
 265 {
 266         int pid, tid, ppid;
 267         char *comm;
 268         struct processtop *parent, *child;
 269         unsigned long timestamp;
 270
 271         timestamp = bt_ctf_get_real_timestamp(call_data);
 272         if (timestamp == -1ULL)
 273                 goto error;
 274
 275         pid = get_context_pid(call_data);
 276         if (pid == -1ULL) {
 277                 goto error;
 278         }
 279         tid = get_context_tid(call_data);
 280         if (tid == -1ULL) {
 281                 goto error;
 282         }
 283         ppid = get_context_ppid(call_data);
 284         if (ppid == -1ULL) {
 285                 goto error;
 286         }
 287         comm = get_context_comm(call_data);
 288         if (!comm) {
 289                 goto error;
 290         }
 291
 292         /* find or create the current process */
 293         child = find_process_tid(&lttngtop, tid, comm);
 294         if (!child)
 295                 child = add_proc(&lttngtop, tid, comm, timestamp);
 296         update_proc(child, pid, tid, ppid, comm);
 297
 298         if (pid != tid) {
 299                 /* find or create the parent */
 300                 parent = find_process_tid(&lttngtop, pid, comm);
 301                 if (!parent) {
 302                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 303                         parent->pid = pid;
 304                 }
 305
 306                 /* attach the parent to the current process */
 307                 child->threadparent = parent;
 308                 add_thread(parent, child);
 309         }
 310
 311         update_perf_counter(child, call_data);
 312
 313         return BT_CB_OK;
 314
 315 error:
 316         return BT_CB_ERROR_STOP;
 317 }
 318
 319 void init_lttngtop()
 320 {
 321         copies = g_ptr_array_new();
 322         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 323
 324         sem_init(&goodtodisplay, 0, 0);
 325         sem_init(&goodtoupdate, 0, 1);
 326         sem_init(&timer, 0, 1);
 327         sem_init(&bootstrap, 0, 0);
 328         sem_init(&pause_sem, 0, 1);
 329         sem_init(&end_trace_sem, 0, 0);
 330
 331         reset_global_counters();
 332         lttngtop.nbproc = 0;
 333         lttngtop.nbthreads = 0;
 334         lttngtop.nbfiles = 0;
 335
 336         lttngtop.process_table = g_ptr_array_new();
 337         lttngtop.files_table = g_ptr_array_new();
 338         lttngtop.cpu_table = g_ptr_array_new();
 339 }
 340
 341 void usage(FILE *fp)
 342 {
 343         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 344         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 345 }
 346
 347 /*
 348  * Return 0 if caller should continue, < 0 if caller should return
 349  * error, > 0 if caller should exit without reporting error.
 350  */
 351 static int parse_options(int argc, char **argv)
 352 {
 353         poptContext pc;
 354         int opt, ret = 0;
 355
 356         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 357         poptReadDefaultConfig(pc, 0);
 358
 359         while ((opt = poptGetNextOpt(pc)) != -1) {
 360                 switch (opt) {
 361                         case OPT_HELP:
 362                                 usage(stdout);
 363                                 ret = 1;    /* exit cleanly */
 364                                 goto end;
 365                         default:
 366                                 ret = -EINVAL;
 367                                 goto end;
 368                 }
 369         }
 370
 371         opt_input_path = poptGetArg(pc);
 372
 373 end:
 374         if (pc) {
 375                 poptFreeContext(pc);
 376         }
 377         return ret;
 378 }
 379
 380 void iter_trace(struct bt_context *bt_ctx)
 381 {
 382         struct bt_ctf_iter *iter;
 383         struct bt_iter_pos begin_pos;
 384         const struct bt_ctf_event *event;
 385         int ret = 0;
 386
 387         begin_pos.type = BT_SEEK_BEGIN;
 388         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 389
 390         /* at each event check if we need to refresh */
 391         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 392                         check_timestamp,
 393                         NULL, NULL, NULL);
 394         /* at each event, verify the status of the process table */
 395         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 396                         fix_process_table,
 397                         NULL, NULL, NULL);
 398         /* to handle the scheduling events */
 399         bt_ctf_iter_add_callback(iter,
 400                         g_quark_from_static_string("sched_switch"),
 401                         NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 402         /* to clean up the process table */
 403         bt_ctf_iter_add_callback(iter,
 404                         g_quark_from_static_string("sched_process_free"),
 405                         NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 406         /* to get all the process from the statedumps */
 407         bt_ctf_iter_add_callback(iter,
 408                         g_quark_from_static_string(
 409                                 "lttng_statedump_process_state"),
 410                         NULL, 0, handle_statedump_process_state,
 411                         NULL, NULL, NULL);
 412
 413         /* for IO top */
 414         bt_ctf_iter_add_callback(iter,
 415                         g_quark_from_static_string("exit_syscall"),
 416                         NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 417         bt_ctf_iter_add_callback(iter,
 418                         g_quark_from_static_string("sys_write"),
 419                         NULL, 0, handle_sys_write, NULL, NULL, NULL);
 420         bt_ctf_iter_add_callback(iter,
 421                         g_quark_from_static_string("sys_read"),
 422                         NULL, 0, handle_sys_read, NULL, NULL, NULL);
 423         bt_ctf_iter_add_callback(iter,
 424                         g_quark_from_static_string("sys_open"),
 425                         NULL, 0, handle_sys_open, NULL, NULL, NULL);
 426         bt_ctf_iter_add_callback(iter,
 427                         g_quark_from_static_string("sys_close"),
 428                         NULL, 0, handle_sys_close, NULL, NULL, NULL);
 429         bt_ctf_iter_add_callback(iter,
 430                         g_quark_from_static_string(
 431                                         "lttng_statedump_file_descriptor"),
 432                         NULL, 0, handle_statedump_file_descriptor,
 433                         NULL, NULL, NULL);
 434
 435         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 436                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 437                 if (ret < 0)
 438                         goto end_iter;
 439         }
 440
 441         /* block until quit, we reached the end of the trace */
 442         sem_wait(&end_trace_sem);
 443
 444 end_iter:
 445         bt_ctf_iter_destroy(iter);
 446 }
 447
 448 /*
 449  * bt_context_add_traces_recursive: Open a trace recursively
 450  * (copied from BSD code in converter/babeltrace.c)
 451  *
 452  * Find each trace present in the subdirectory starting from the given
 453  * path, and add them to the context. The packet_seek parameter can be
 454  * NULL: this specify to use the default format packet_seek.
 455  *
 456  * Return: 0 on success, nonzero on failure.
 457  * Unable to open toplevel: failure.
 458  * Unable to open some subdirectory or file: warn and continue;
 459  */
 460 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 461                 const char *format_str,
 462                 void (*packet_seek)(struct bt_stream_pos *pos,
 463                         size_t offset, int whence))
 464 {
 465         FTS *tree;
 466         FTSENT *node;
 467         GArray *trace_ids;
 468         char lpath[PATH_MAX];
 469         char * const paths[2] = { lpath, NULL };
 470         int ret = -1;
 471
 472         /*
 473          * Need to copy path, because fts_open can change it.
 474          * It is the pointer array, not the strings, that are constant.
 475          */
 476         strncpy(lpath, path, PATH_MAX);
 477         lpath[PATH_MAX - 1] = '\0';
 478
 479         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 480         if (tree == NULL) {
 481                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 482                                 path);
 483                 return -EINVAL;
 484         }
 485
 486         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 487
 488         while ((node = fts_read(tree))) {
 489                 int dirfd, metafd;
 490
 491                 if (!(node->fts_info & FTS_D))
 492                         continue;
 493
 494                 dirfd = open(node->fts_accpath, 0);
 495                 if (dirfd < 0) {
 496                         fprintf(stderr, "[error] [Context] Unable to open trace "
 497                                 "directory file descriptor.\n");
 498                         ret = dirfd;
 499                         goto error;
 500                 }
 501                 metafd = openat(dirfd, "metadata", O_RDONLY);
 502                 if (metafd < 0) {
 503                         close(dirfd);
 504                         ret = -1;
 505                         continue;
 506                 } else {
 507                         int trace_id;
 508
 509                         ret = close(metafd);
 510                         if (ret < 0) {
 511                                 perror("close");
 512                                 goto error;
 513                         }
 514                         ret = close(dirfd);
 515                         if (ret < 0) {
 516                                 perror("close");
 517                                 goto error;
 518                         }
 519
 520                         trace_id = bt_context_add_trace(ctx,
 521                                 node->fts_accpath, format_str,
 522                                 packet_seek, NULL, NULL);
 523                         if (trace_id < 0) {
 524                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 525                                         "for reading.\n", node->fts_accpath, path);
 526                                 /* Allow to skip erroneous traces. */
 527                                 continue;
 528                         }
 529                         g_array_append_val(trace_ids, trace_id);
 530                 }
 531         }
 532
 533         g_array_free(trace_ids, TRUE);
 534         return ret;
 535
 536 error:
 537         return ret;
 538 }
 539
 540 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 541                 int field_cnt, int *tid_check, int *pid_check,
 542                 int *procname_check, int *ppid_check)
 543 {
 544         int j;
 545         struct perfcounter *global;
 546         const char *name;
 547
 548         for (j = 0; j < field_cnt; j++) {
 549                 name = bt_ctf_get_decl_field_name(field_list[j]);
 550                 if (*tid_check == 0) {
 551                         if (strncmp(name, "tid", 3) == 0)
 552                                 (*tid_check)++;
 553                 }
 554                 if (*pid_check == 0) {
 555                         if (strncmp(name, "pid", 3) == 0)
 556                                 (*pid_check)++;
 557                 }
 558                 if (*ppid_check == 0) {
 559                         if (strncmp(name, "ppid", 4) == 0)
 560                                 (*ppid_check)++;
 561                 }
 562                 if (*procname_check == 0) {
 563                         if (strncmp(name, "procname", 8) == 0)
 564                                 (*procname_check)++;
 565                 }
 566                 if (strncmp(name, "perf_", 5) == 0) {
 567                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 568                         if (!global) {
 569                                 global = g_new0(struct perfcounter, 1);
 570                                 /* by default, sort on the first perf context */
 571                                 if (g_hash_table_size(global_perf_liszt) == 0)
 572                                         global->sort = 1;
 573                                 global->visible = 1;
 574                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 575                         }
 576                 }
 577         }
 578
 579         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 580                         *procname_check == 1)
 581                 return 0;
 582
 583         return -1;
 584 }
 585
 586 /*
 587  * check_requirements: check if the required context informations are available
 588  *
 589  * If each mandatory context information is available for at least in one
 590  * event, return 0 otherwise return -1.
 591  */
 592 int check_requirements(struct bt_context *ctx)
 593 {
 594         unsigned int i, evt_cnt, field_cnt;
 595         struct bt_ctf_event_decl *const * evt_list;
 596         const struct bt_ctf_field_decl *const * field_list;
 597         int tid_check = 0;
 598         int pid_check = 0;
 599         int procname_check = 0;
 600         int ppid_check = 0;
 601         int ret = 0;
 602
 603         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 604         for (i = 0; i < evt_cnt; i++) {
 605                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 606                                 &field_list, &field_cnt);
 607                 ret = check_field_requirements(field_list, field_cnt,
 608                                 &tid_check, &pid_check, &procname_check,
 609                                 &ppid_check);
 610
 611                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 612                                 &field_list, &field_cnt);
 613                 ret = check_field_requirements(field_list, field_cnt,
 614                                 &tid_check, &pid_check, &procname_check,
 615                                 &ppid_check);
 616
 617                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 618                                 &field_list, &field_cnt);
 619                 ret = check_field_requirements(field_list, field_cnt,
 620                                 &tid_check, &pid_check, &procname_check,
 621                                 &ppid_check);
 622         }
 623
 624         if (tid_check == 0) {
 625                 ret = -1;
 626                 fprintf(stderr, "[error] missing tid context information\n");
 627         }
 628         if (pid_check == 0) {
 629                 ret = -1;
 630                 fprintf(stderr, "[error] missing pid context information\n");
 631         }
 632         if (ppid_check == 0) {
 633                 ret = -1;
 634                 fprintf(stderr, "[error] missing ppid context information\n");
 635         }
 636         if (procname_check == 0) {
 637                 ret = -1;
 638                 fprintf(stderr, "[error] missing procname context information\n");
 639         }
 640
 641         return ret;
 642 }
 643
 644 void dump_snapshot()
 645 {
 646         struct lttng_consumer_stream *iter;
 647         unsigned long spos;
 648         struct mmap_stream *new_snapshot;
 649
 650         int ret = 0;
 651         int i;
 652         /*
 653          * try lock mutex ressource courante (overrun)
 654          * if fail : overrun
 655          * stop trace (flush implicite avant stop)
 656          * lttng_consumer_take_snapshot
 657          * read timestamp packet end (use time as end pos)
 658          *      - stream_packet_context
 659          *      - reculer de 1 subbuf : pos - max_subbuff_size
 660          *
 661          *      - position de fin (take_snapshot)
 662          *      - mov_pos_slow ( fin - max_subbuff_size) lire timestamp packet end
 663          *      - prend min(end) (activité sur tous les streams)
 664          *
 665          * start trace
 666          * unlock mutex
 667          */
 668
 669         helper_kernctl_buffer_flush(consumerd_metadata);
 670         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 671                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 672                 helper_kernctl_buffer_flush(helper_get_lttng_consumer_stream_wait_fd(iter));
 673                 ret = helper_lttng_consumer_take_snapshot(ctx, iter);
 674                 if (ret != 0) {
 675                         ret = errno;
 676                         perror("lttng_consumer_take_snapshots");
 677                         goto end;
 678                 }
 679         }
 680         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 681                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 682         //cds_list_for_each_entry(iter2, &mmap_stream_list.head, list) {
 683
 684                 ret = helper_lttng_consumer_get_produced_snapshot(ctx, iter, &spos);
 685                 if (ret != 0) {
 686                         ret = errno;
 687                         perror("helper_lttng_consumer_get_produced_snapshot");
 688                         goto end;
 689                 }
 690                 //while (iter->last_pos < spos) { FIXME : last_pos does not exists
 691                         new_snapshot = g_new0(struct mmap_stream, 1);
 692                         new_snapshot->fd = helper_get_lttng_consumer_stream_wait_fd(iter);
 693                         //FIXME new_snapshot->last_pos = iter->last_pos; /* not last_pos, pos for the snapshot */
 694 //                      fprintf(stderr,"ADDING AVAILABLE SNAPSHOT ON FD %d AT POSITION %lu\n",
 695 //                                      new_snapshot->kconsumerd_fd->wait_fd,
 696 //                                      new_snapshot->last_pos);
 697                         g_ptr_array_add(available_snapshots, new_snapshot);
 698                         //FIXME iter->last_pos += iter->chan->max_sb_size;
 699                 //}
 700         }
 701
 702         if (!metadata_ready) {
 703 //              fprintf(stderr, "BLOCKING BEFORE METADATA\n");
 704                 sem_wait(&metadata_available);
 705 //              fprintf(stderr,"OPENING TRACE\n");
 706                 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 707                         fprintf(stderr,"NO METADATA FILE, SKIPPING\n");
 708                         return;
 709                 }
 710                 metadata_ready = 1;
 711                 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 712         }
 713
 714         if (!trace_opened) {
 715                 //bt_ctx = bt_context_create();
 716 //              ret = bt_context_add_trace(ctx, NULL, "ctf", ctf_move_mmap_pos_slow, mmap_list, metadata_fp);
 717                 trace_opened = 1;
 718         }
 719         //iter_trace(bt_ctx);
 720
 721 end:
 722         return;
 723 }
 724
 725 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 726                 struct lttng_consumer_local_data *ctx)
 727 {
 728         unsigned long len;
 729         int err;
 730         long ret = 0;
 731         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 732
 733         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 734                 /* Get the next subbuffer */
 735                 printf("get_next : %d\n", infd);
 736                 err = helper_kernctl_get_next_subbuf(infd);
 737                 if (err != 0) {
 738                         ret = errno;
 739                         perror("Reserving sub buffer failed (everything is normal, "
 740                                         "it is due to concurrency)");
 741                         goto end;
 742                 }
 743                 /* read the whole subbuffer */
 744                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 745                 if (err != 0) {
 746                         ret = errno;
 747                         perror("Getting sub-buffer len failed.");
 748                         goto end;
 749                 }
 750                 printf("len : %ld\n", len);
 751
 752                 /* splice the subbuffer to the tracefile */
 753                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 754                 if (ret < 0) {
 755                         /*
 756                          * display the error but continue processing to try
 757                          * to release the subbuffer
 758                          */
 759                         fprintf(stderr,"Error splicing to tracefile\n");
 760                 }
 761                 printf("ret : %ld\n", ret);
 762                 printf("put_next : %d\n", infd);
 763                 err = helper_kernctl_put_next_subbuf(infd);
 764                 if (err != 0) {
 765                         ret = errno;
 766                         perror("Reserving sub buffer failed (everything is normal, "
 767                                         "it is due to concurrency)");
 768                         goto end;
 769                 }
 770                 sem_post(&metadata_available);
 771         }
 772
 773 end:
 774         return 0;
 775 }
 776
 777 int on_update_fd(int key, uint32_t state)
 778 {
 779         /* let the lib handle the metadata FD */
 780         if (key == sessiond_metadata)
 781                 return 0;
 782         return 1;
 783 }
 784
 785 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
 786 {
 787         int ret;
 788         struct mmap_stream *new_info;
 789         size_t tmp_mmap_len;
 790
 791         /* Opening the tracefile in write mode */
 792         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
 793                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
 794                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
 795                 if (ret < 0) {
 796                         perror("open");
 797                         goto end;
 798                 }
 799                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
 800         }
 801
 802         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
 803                 new_info = malloc(sizeof(struct mmap_stream));
 804                 new_info->fd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 805                 bt_list_add(&new_info->list, &mmap_list.head);
 806
 807                 /* get the len of the mmap region */
 808                 ret = helper_kernctl_get_mmap_len(helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd),
 809                                 &tmp_mmap_len);
 810                 if (ret != 0) {
 811                         ret = errno;
 812                         perror("helper_kernctl_get_mmap_len");
 813                         goto end;
 814                 }
 815                 helper_set_lttng_consumer_stream_mmap_len(kconsumerd_fd, tmp_mmap_len);
 816
 817                 helper_set_lttng_consumer_stream_mmap_base(kconsumerd_fd,
 818                                 mmap(NULL, helper_get_lttng_consumer_stream_mmap_len(kconsumerd_fd),
 819                                 PROT_READ, MAP_PRIVATE, helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd), 0));
 820                 if (helper_get_lttng_consumer_stream_mmap_base(kconsumerd_fd) == MAP_FAILED) {
 821                         perror("Error mmaping");
 822                         ret = -1;
 823                         goto end;
 824                 }
 825
 826                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
 827                 ret = 1;
 828         } else {
 829                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 830                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
 831                 ret = 0;
 832         }
 833
 834 end:
 835         return ret;
 836 }
 837
 838
 839 int setup_consumer(char *command_sock_path, pthread_t *threads,
 840                 struct lttng_consumer_local_data *ctx)
 841 {
 842         int ret = 0;
 843
 844         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 845                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 846         if (!ctx)
 847                 goto end;
 848
 849         unlink(command_sock_path);
 850         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 851         helper_lttng_consumer_init();
 852
 853         /* Create the thread to manage the receive of fd */
 854         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 855                         (void *) ctx);
 856         if (ret != 0) {
 857                 perror("pthread_create");
 858                 goto end;
 859         }
 860         /* Create thread to manage the polling/writing of traces */
 861         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 862                         (void *) ctx);
 863         if (ret != 0) {
 864                 perror("pthread_create");
 865                 goto end;
 866         }
 867
 868 end:
 869         return ret;
 870 }
 871
 872 int setup_live_tracing()
 873 {
 874         struct lttng_domain dom;
 875         struct lttng_channel chan;
 876         char *channel_name = "mmapchan";
 877         struct lttng_event ev;
 878         int ret = 0;
 879         char *command_sock_path = "/tmp/consumerd_sock";
 880         static pthread_t threads[2]; /* recv_fd, poll */
 881         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 882
 883         struct lttng_handle *handle;
 884
 885         BT_INIT_LIST_HEAD(&mmap_list.head);
 886
 887         lttng_consumer_stream_array = g_ptr_array_new();
 888
 889         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 890                 fprintf(stderr,"error setting up consumer\n");
 891                 goto end;
 892         }
 893
 894         available_snapshots = g_ptr_array_new();
 895
 896         /* setup the session */
 897         dom.type = LTTNG_DOMAIN_KERNEL;
 898
 899         ret = system("rm -rf /tmp/livesession");
 900
 901         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 902                 fprintf(stderr,"error creating the session : %s\n",
 903                                 helper_lttcomm_get_readable_code(ret));
 904                 goto end;
 905         }
 906
 907         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 908                 fprintf(stderr,"error creating handle\n");
 909                 goto end;
 910         }
 911
 912         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 913                 fprintf(stderr,"error registering consumer : %s\n",
 914                                 helper_lttcomm_get_readable_code(ret));
 915                 goto end;
 916         }
 917
 918         strcpy(chan.name, channel_name);
 919         chan.attr.overwrite = 1;
 920 //      chan.attr.subbuf_size = 32768;
 921         chan.attr.subbuf_size = 1048576; /* 1MB */
 922         chan.attr.num_subbuf = 4;
 923         chan.attr.switch_timer_interval = 0;
 924         chan.attr.read_timer_interval = 200;
 925         chan.attr.output = LTTNG_EVENT_MMAP;
 926
 927         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
 928                 fprintf(stderr,"error creating channel : %s\n", helper_lttcomm_get_readable_code(ret));
 929                 goto end;
 930         }
 931
 932         sprintf(ev.name, "sched_switch");
 933         ev.type = LTTNG_EVENT_TRACEPOINT;
 934
 935         //if ((ret = lttng_enable_event(handle, NULL, channel_name)) < 0) {
 936         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 937                 fprintf(stderr,"error enabling event : %s\n", helper_lttcomm_get_readable_code(ret));
 938                 goto end;
 939         }
 940
 941         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
 942         lttng_add_context(handle, &kctxpid, NULL, NULL);
 943         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
 944         lttng_add_context(handle, &kctxppid, NULL, NULL);
 945         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
 946         lttng_add_context(handle, &kctxcomm, NULL, NULL);
 947         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
 948         lttng_add_context(handle, &kctxtid, NULL, NULL);
 949
 950         if ((ret = lttng_start_tracing("test")) < 0) {
 951                 fprintf(stderr,"error starting tracing : %s\n", helper_lttcomm_get_readable_code(ret));
 952                 goto end;
 953         }
 954
 955         helper_kernctl_buffer_flush(consumerd_metadata);
 956         sleep(10);
 957
 958         lttng_stop_tracing("test");
 959         lttng_destroy_session("test");
 960
 961         /* block until metadata is ready */
 962         sem_init(&metadata_available, 0, 0);
 963
 964         //init_lttngtop();
 965
 966 end:
 967         return ret;
 968 }
 969
 970 int main(int argc, char **argv)
 971 {
 972         int ret;
 973         struct bt_context *bt_ctx = NULL;
 974
 975         ret = parse_options(argc, argv);
 976         if (ret < 0) {
 977                 fprintf(stdout, "Error parsing options.\n\n");
 978                 usage(stdout);
 979                 exit(EXIT_FAILURE);
 980         } else if (ret > 0) {
 981                 exit(EXIT_SUCCESS);
 982         }
 983
 984         if (!opt_input_path) {
 985                 printf("live tracing enabled\n");
 986                 setup_live_tracing();
 987                 goto end;
 988         } else {
 989                 init_lttngtop();
 990
 991                 bt_ctx = bt_context_create();
 992                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
 993                 if (ret < 0) {
 994                         fprintf(stderr, "[error] Opening the trace\n");
 995                         goto end;
 996                 }
 997
 998                 ret = check_requirements(bt_ctx);
 999                 if (ret < 0) {
1000                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1001                         goto end;
1002                 }
1003                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1004                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1005
1006                 iter_trace(bt_ctx);
1007
1008                 quit = 1;
1009                 pthread_join(display_thread, NULL);
1010                 pthread_join(timer_thread, NULL);
1011         }
1012
1013 end:
1014         if (bt_ctx)
1015                 bt_context_put(bt_ctx);
1016
1017         return 0;
1018 }