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
  55 struct lttngtop *copy;
  56 pthread_t display_thread;
  57 pthread_t timer_thread;
  58 pthread_t live_trace_thread;
  59
  60 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  61 unsigned long last_display_update = 0;
  62 int quit = 0;
  63
  64 /* LIVE */
  65 pthread_t thread_live_consume;
  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 FILE *metadata_fp;
  75 int trace_opened = 0;
  76 int metadata_ready = 0;
  77
  78 enum {
  79         OPT_NONE = 0,
  80         OPT_HELP,
  81         OPT_LIST,
  82         OPT_VERBOSE,
  83         OPT_DEBUG,
  84         OPT_NAMES,
  85 };
  86
  87 static struct poptOption long_options[] = {
  88         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  89         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  90         { NULL, 0, 0, NULL, 0, NULL, NULL },
  91 };
  92
  93 void *refresh_thread(void *p)
  94 {
  95         while (1) {
  96                 if (quit)
  97                         return NULL;
  98                 sem_wait(&pause_sem);
  99                 sem_post(&pause_sem);
 100                 sem_post(&timer);
 101                 sleep(refresh_display/NSEC_PER_SEC);
 102         }
 103 }
 104
 105 void *ncurses_display(void *p)
 106 {
 107         unsigned int current_display_index = 0;
 108
 109         sem_wait(&bootstrap);
 110         /*
 111          * Prevent the 1 second delay when we hit ESC
 112          */
 113         ESCDELAY = 0;
 114         init_ncurses();
 115
 116         while (1) {
 117                 sem_wait(&timer);
 118                 sem_wait(&goodtodisplay);
 119                 sem_wait(&pause_sem);
 120
 121                 copy = g_ptr_array_index(copies, current_display_index);
 122                 assert(copy);
 123                 display(current_display_index++);
 124
 125                 sem_post(&goodtoupdate);
 126                 sem_post(&pause_sem);
 127
 128                 if (quit) {
 129                         reset_ncurses();
 130                         pthread_exit(0);
 131                 }
 132         }
 133 }
 134
 135 /*
 136  * hook on each event to check the timestamp and refresh the display if
 137  * necessary
 138  */
 139 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 140 {
 141         unsigned long timestamp;
 142
 143         timestamp = bt_ctf_get_timestamp(call_data);
 144         if (timestamp == -1ULL)
 145                 goto error;
 146
 147         if (last_display_update == 0)
 148                 last_display_update = timestamp;
 149
 150         if (timestamp - last_display_update >= refresh_display) {
 151                 sem_wait(&goodtoupdate);
 152                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 153                                         timestamp));
 154                 sem_post(&goodtodisplay);
 155                 sem_post(&bootstrap);
 156                 last_display_update = timestamp;
 157         }
 158         return BT_CB_OK;
 159
 160 error:
 161         fprintf(stderr, "check_timestamp callback error\n");
 162         return BT_CB_ERROR_STOP;
 163 }
 164
 165 /*
 166  * get_perf_counter : get or create and return a perf_counter struct for
 167  * either a process or a cpu (only one of the 2 parameters mandatory)
 168  */
 169 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 170                 struct cputime *cpu)
 171 {
 172         struct perfcounter *ret;
 173         GHashTable *table;
 174
 175         if (proc)
 176                 table = proc->perf;
 177         else if (cpu)
 178                 table = cpu->perf;
 179         else
 180                 goto error;
 181
 182         ret = g_hash_table_lookup(table, (gpointer) name);
 183         if (ret)
 184                 goto end;
 185
 186         ret = g_new0(struct perfcounter, 1);
 187         /* by default, make it visible in the UI */
 188         ret->visible = 1;
 189         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 190
 191 end:
 192         return ret;
 193
 194 error:
 195         return NULL;
 196 }
 197
 198 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 199                 const char *name, int value)
 200 {
 201         struct perfcounter *cpu_perf, *process_perf;
 202
 203         cpu_perf = get_perf_counter(name, NULL, cpu);
 204         if (cpu_perf->count < value) {
 205                 process_perf = get_perf_counter(name, proc, NULL);
 206                 process_perf->count += value - cpu_perf->count;
 207                 cpu_perf->count = value;
 208         }
 209 }
 210
 211 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 212                 const struct bt_definition *scope,
 213                 struct processtop *proc,
 214                 struct cputime *cpu)
 215 {
 216         struct bt_definition const * const *list = NULL;
 217         const struct bt_definition *field;
 218         unsigned int count;
 219         struct perfcounter *perfcounter;
 220         GHashTableIter iter;
 221         gpointer key;
 222         int ret;
 223
 224         if (!scope)
 225                 goto end;
 226
 227         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 228         if (ret < 0)
 229                 goto end;
 230
 231         if (count == 0)
 232                 goto end;
 233
 234         g_hash_table_iter_init(&iter, global_perf_liszt);
 235         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 236                 field = bt_ctf_get_field(event, scope, (char *) key);
 237                 if (field) {
 238                         int value = bt_ctf_get_uint64(field);
 239                         if (bt_ctf_field_get_error())
 240                                 continue;
 241                         update_perf_value(proc, cpu, (char *) key, value);
 242                 }
 243         }
 244
 245 end:
 246         return;
 247 }
 248
 249 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 250 {
 251         struct cputime *cpu;
 252         const struct bt_definition *scope;
 253
 254         cpu = get_cpu(get_cpu_id(event));
 255
 256         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 257         extract_perf_counter_scope(event, scope, proc, cpu);
 258
 259         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 260         extract_perf_counter_scope(event, scope, proc, cpu);
 261
 262         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 263         extract_perf_counter_scope(event, scope, proc, cpu);
 264 }
 265
 266 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 267                 void *private_data)
 268 {
 269         int pid, tid, ppid;
 270         char *comm;
 271         struct processtop *parent, *child;
 272         unsigned long timestamp;
 273
 274         timestamp = bt_ctf_get_timestamp(call_data);
 275         if (timestamp == -1ULL)
 276                 goto error;
 277
 278         pid = get_context_pid(call_data);
 279         if (pid == -1ULL) {
 280                 goto error;
 281         }
 282         tid = get_context_tid(call_data);
 283         if (tid == -1ULL) {
 284                 goto error;
 285         }
 286         ppid = get_context_ppid(call_data);
 287         if (ppid == -1ULL) {
 288                 goto error;
 289         }
 290         comm = get_context_comm(call_data);
 291         if (!comm) {
 292                 goto error;
 293         }
 294
 295         /* find or create the current process */
 296         child = find_process_tid(&lttngtop, tid, comm);
 297         if (!child)
 298                 child = add_proc(&lttngtop, tid, comm, timestamp);
 299         update_proc(child, pid, tid, ppid, comm);
 300
 301         if (pid != tid) {
 302                 /* find or create the parent */
 303                 parent = find_process_tid(&lttngtop, pid, comm);
 304                 if (!parent) {
 305                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 306                         parent->pid = pid;
 307                 }
 308
 309                 /* attach the parent to the current process */
 310                 child->threadparent = parent;
 311                 add_thread(parent, child);
 312         }
 313
 314         update_perf_counter(child, call_data);
 315
 316         return BT_CB_OK;
 317
 318 error:
 319         return BT_CB_ERROR_STOP;
 320 }
 321
 322 void init_lttngtop()
 323 {
 324         copies = g_ptr_array_new();
 325         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 326
 327         sem_init(&goodtodisplay, 0, 0);
 328         sem_init(&goodtoupdate, 0, 1);
 329         sem_init(&timer, 0, 1);
 330         sem_init(&bootstrap, 0, 0);
 331         sem_init(&pause_sem, 0, 1);
 332         sem_init(&end_trace_sem, 0, 0);
 333
 334         reset_global_counters();
 335         lttngtop.nbproc = 0;
 336         lttngtop.nbthreads = 0;
 337         lttngtop.nbfiles = 0;
 338
 339         lttngtop.process_table = g_ptr_array_new();
 340         lttngtop.files_table = g_ptr_array_new();
 341         lttngtop.cpu_table = g_ptr_array_new();
 342 }
 343
 344 void usage(FILE *fp)
 345 {
 346         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 347         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 348 }
 349
 350 /*
 351  * Return 0 if caller should continue, < 0 if caller should return
 352  * error, > 0 if caller should exit without reporting error.
 353  */
 354 static int parse_options(int argc, char **argv)
 355 {
 356         poptContext pc;
 357         int opt, ret = 0;
 358
 359         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 360         poptReadDefaultConfig(pc, 0);
 361
 362         while ((opt = poptGetNextOpt(pc)) != -1) {
 363                 switch (opt) {
 364                         case OPT_HELP:
 365                                 usage(stdout);
 366                                 ret = 1;    /* exit cleanly */
 367                                 goto end;
 368                         default:
 369                                 ret = -EINVAL;
 370                                 goto end;
 371                 }
 372         }
 373
 374         opt_input_path = poptGetArg(pc);
 375
 376 end:
 377         if (pc) {
 378                 poptFreeContext(pc);
 379         }
 380         return ret;
 381 }
 382
 383 void iter_trace(struct bt_context *bt_ctx)
 384 {
 385         struct bt_ctf_iter *iter;
 386         struct bt_iter_pos begin_pos;
 387         const struct bt_ctf_event *event;
 388         int ret = 0;
 389
 390         begin_pos.type = BT_SEEK_BEGIN;
 391         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 392
 393         /* at each event check if we need to refresh */
 394         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 395                         check_timestamp,
 396                         NULL, NULL, NULL);
 397         /* at each event, verify the status of the process table */
 398         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 399                         fix_process_table,
 400                         NULL, NULL, NULL);
 401         /* to handle the scheduling events */
 402         bt_ctf_iter_add_callback(iter,
 403                         g_quark_from_static_string("sched_switch"),
 404                         NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 405         /* to clean up the process table */
 406         bt_ctf_iter_add_callback(iter,
 407                         g_quark_from_static_string("sched_process_free"),
 408                         NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 409         /* to get all the process from the statedumps */
 410         bt_ctf_iter_add_callback(iter,
 411                         g_quark_from_static_string(
 412                                 "lttng_statedump_process_state"),
 413                         NULL, 0, handle_statedump_process_state,
 414                         NULL, NULL, NULL);
 415
 416         /* for IO top */
 417         bt_ctf_iter_add_callback(iter,
 418                         g_quark_from_static_string("exit_syscall"),
 419                         NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 420         bt_ctf_iter_add_callback(iter,
 421                         g_quark_from_static_string("sys_write"),
 422                         NULL, 0, handle_sys_write, NULL, NULL, NULL);
 423         bt_ctf_iter_add_callback(iter,
 424                         g_quark_from_static_string("sys_read"),
 425                         NULL, 0, handle_sys_read, NULL, NULL, NULL);
 426         bt_ctf_iter_add_callback(iter,
 427                         g_quark_from_static_string("sys_open"),
 428                         NULL, 0, handle_sys_open, NULL, NULL, NULL);
 429         bt_ctf_iter_add_callback(iter,
 430                         g_quark_from_static_string("sys_close"),
 431                         NULL, 0, handle_sys_close, NULL, NULL, NULL);
 432         bt_ctf_iter_add_callback(iter,
 433                         g_quark_from_static_string(
 434                                         "lttng_statedump_file_descriptor"),
 435                         NULL, 0, handle_statedump_file_descriptor,
 436                         NULL, NULL, NULL);
 437
 438         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 439                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 440                 if (ret < 0)
 441                         goto end_iter;
 442         }
 443
 444         /* block until quit, we reached the end of the trace */
 445         sem_wait(&end_trace_sem);
 446
 447 end_iter:
 448         bt_ctf_iter_destroy(iter);
 449 }
 450
 451 /*
 452  * bt_context_add_traces_recursive: Open a trace recursively
 453  * (copied from BSD code in converter/babeltrace.c)
 454  *
 455  * Find each trace present in the subdirectory starting from the given
 456  * path, and add them to the context. The packet_seek parameter can be
 457  * NULL: this specify to use the default format packet_seek.
 458  *
 459  * Return: 0 on success, nonzero on failure.
 460  * Unable to open toplevel: failure.
 461  * Unable to open some subdirectory or file: warn and continue;
 462  */
 463 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 464                 const char *format_str,
 465                 void (*packet_seek)(struct bt_stream_pos *pos,
 466                         size_t offset, int whence))
 467 {
 468         FTS *tree;
 469         FTSENT *node;
 470         GArray *trace_ids;
 471         char lpath[PATH_MAX];
 472         char * const paths[2] = { lpath, NULL };
 473         int ret = -1;
 474
 475         /*
 476          * Need to copy path, because fts_open can change it.
 477          * It is the pointer array, not the strings, that are constant.
 478          */
 479         strncpy(lpath, path, PATH_MAX);
 480         lpath[PATH_MAX - 1] = '\0';
 481
 482         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 483         if (tree == NULL) {
 484                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 485                                 path);
 486                 return -EINVAL;
 487         }
 488
 489         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 490
 491         while ((node = fts_read(tree))) {
 492                 int dirfd, metafd;
 493
 494                 if (!(node->fts_info & FTS_D))
 495                         continue;
 496
 497                 dirfd = open(node->fts_accpath, 0);
 498                 if (dirfd < 0) {
 499                         fprintf(stderr, "[error] [Context] Unable to open trace "
 500                                 "directory file descriptor.\n");
 501                         ret = dirfd;
 502                         goto error;
 503                 }
 504                 metafd = openat(dirfd, "metadata", O_RDONLY);
 505                 if (metafd < 0) {
 506                         close(dirfd);
 507                         ret = -1;
 508                         continue;
 509                 } else {
 510                         int trace_id;
 511
 512                         ret = close(metafd);
 513                         if (ret < 0) {
 514                                 perror("close");
 515                                 goto error;
 516                         }
 517                         ret = close(dirfd);
 518                         if (ret < 0) {
 519                                 perror("close");
 520                                 goto error;
 521                         }
 522
 523                         trace_id = bt_context_add_trace(ctx,
 524                                 node->fts_accpath, format_str,
 525                                 packet_seek, NULL, NULL);
 526                         if (trace_id < 0) {
 527                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 528                                         "for reading.\n", node->fts_accpath, path);
 529                                 /* Allow to skip erroneous traces. */
 530                                 continue;
 531                         }
 532                         g_array_append_val(trace_ids, trace_id);
 533                 }
 534         }
 535
 536         g_array_free(trace_ids, TRUE);
 537         return ret;
 538
 539 error:
 540         return ret;
 541 }
 542
 543 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 544                 int field_cnt, int *tid_check, int *pid_check,
 545                 int *procname_check, int *ppid_check)
 546 {
 547         int j;
 548         struct perfcounter *global;
 549         const char *name;
 550
 551         for (j = 0; j < field_cnt; j++) {
 552                 name = bt_ctf_get_decl_field_name(field_list[j]);
 553                 if (*tid_check == 0) {
 554                         if (strncmp(name, "tid", 3) == 0)
 555                                 (*tid_check)++;
 556                 }
 557                 if (*pid_check == 0) {
 558                         if (strncmp(name, "pid", 3) == 0)
 559                                 (*pid_check)++;
 560                 }
 561                 if (*ppid_check == 0) {
 562                         if (strncmp(name, "ppid", 4) == 0)
 563                                 (*ppid_check)++;
 564                 }
 565                 if (*procname_check == 0) {
 566                         if (strncmp(name, "procname", 8) == 0)
 567                                 (*procname_check)++;
 568                 }
 569                 if (strncmp(name, "perf_", 5) == 0) {
 570                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 571                         if (!global) {
 572                                 global = g_new0(struct perfcounter, 1);
 573                                 /* by default, sort on the first perf context */
 574                                 if (g_hash_table_size(global_perf_liszt) == 0)
 575                                         global->sort = 1;
 576                                 global->visible = 1;
 577                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 578                         }
 579                 }
 580         }
 581
 582         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 583                         *procname_check == 1)
 584                 return 0;
 585
 586         return -1;
 587 }
 588
 589 /*
 590  * check_requirements: check if the required context informations are available
 591  *
 592  * If each mandatory context information is available for at least in one
 593  * event, return 0 otherwise return -1.
 594  */
 595 int check_requirements(struct bt_context *ctx)
 596 {
 597         unsigned int i, evt_cnt, field_cnt;
 598         struct bt_ctf_event_decl *const * evt_list;
 599         const struct bt_ctf_field_decl *const * field_list;
 600         int tid_check = 0;
 601         int pid_check = 0;
 602         int procname_check = 0;
 603         int ppid_check = 0;
 604         int ret = 0;
 605
 606         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 607         for (i = 0; i < evt_cnt; i++) {
 608                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 609                                 &field_list, &field_cnt);
 610                 ret = check_field_requirements(field_list, field_cnt,
 611                                 &tid_check, &pid_check, &procname_check,
 612                                 &ppid_check);
 613
 614                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 615                                 &field_list, &field_cnt);
 616                 ret = check_field_requirements(field_list, field_cnt,
 617                                 &tid_check, &pid_check, &procname_check,
 618                                 &ppid_check);
 619
 620                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 621                                 &field_list, &field_cnt);
 622                 ret = check_field_requirements(field_list, field_cnt,
 623                                 &tid_check, &pid_check, &procname_check,
 624                                 &ppid_check);
 625         }
 626
 627         if (tid_check == 0) {
 628                 ret = -1;
 629                 fprintf(stderr, "[error] missing tid context information\n");
 630         }
 631         if (pid_check == 0) {
 632                 ret = -1;
 633                 fprintf(stderr, "[error] missing pid context information\n");
 634         }
 635         if (ppid_check == 0) {
 636                 ret = -1;
 637                 fprintf(stderr, "[error] missing ppid context information\n");
 638         }
 639         if (procname_check == 0) {
 640                 ret = -1;
 641                 fprintf(stderr, "[error] missing procname context information\n");
 642         }
 643
 644         return ret;
 645 }
 646
 647 void dump_snapshot()
 648 {
 649 #if 0
 650         struct lttng_consumer_stream *iter;
 651         unsigned long spos;
 652         struct mmap_stream *new_snapshot;
 653
 654         int ret = 0;
 655         int i;
 656         /*
 657          * try lock mutex ressource courante (overrun)
 658          * if fail : overrun
 659          * stop trace (flush implicite avant stop)
 660          * lttng_consumer_take_snapshot
 661          * read timestamp packet end (use time as end pos)
 662          *      - stream_packet_context
 663          *      - reculer de 1 subbuf : pos - max_subbuff_size
 664          *
 665          *      - position de fin (take_snapshot)
 666          *      - mov_pos_slow ( fin - max_subbuff_size) lire timestamp packet end
 667          *      - prend min(end) (activité sur tous les streams)
 668          *
 669          * start trace
 670          * unlock mutex
 671          */
 672
 673         helper_kernctl_buffer_flush(consumerd_metadata);
 674         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 675                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 676                 helper_kernctl_buffer_flush(helper_get_lttng_consumer_stream_wait_fd(iter));
 677                 printf("Taking snapshot of fd : %d\n", helper_get_lttng_consumer_stream_wait_fd(iter));
 678                 ret = helper_lttng_consumer_take_snapshot(ctx, iter);
 679                 if (ret != 0) {
 680                         ret = errno;
 681                         perror("lttng_consumer_take_snapshots");
 682                         goto end;
 683                 }
 684         }
 685         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 686                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 687                 ret = helper_lttng_consumer_get_produced_snapshot(ctx, iter, &spos);
 688                 if (ret != 0) {
 689                         ret = errno;
 690                         perror("helper_lttng_consumer_get_produced_snapshot");
 691                         goto end;
 692                 }
 693                 while (helper_get_lttng_consumer_stream_wait_last_pos(iter) < spos) {
 694                         new_snapshot = g_new0(struct mmap_stream, 1);
 695                         new_snapshot->fd = helper_get_lttng_consumer_stream_wait_fd(iter);
 696                         new_snapshot->last_pos = helper_get_lttng_consumer_stream_wait_last_pos(iter);
 697                         fprintf(stderr,"ADDING AVAILABLE SNAPSHOT ON FD %d AT POSITION %lu\n",
 698                                         new_snapshot->fd,
 699                                         new_snapshot->last_pos);
 700                         g_ptr_array_add(available_snapshots, new_snapshot);
 701                         helper_set_lttng_consumer_stream_wait_last_pos(iter,
 702                                 helper_get_lttng_consumer_stream_wait_last_pos(iter) +
 703                                 helper_get_lttng_consumer_stream_chan_max_sb_size(iter));
 704                 }
 705         }
 706
 707         if (!metadata_ready) {
 708                 fprintf(stderr, "BLOCKING BEFORE METADATA\n");
 709                 sem_wait(&metadata_available);
 710                 fprintf(stderr,"OPENING TRACE\n");
 711                 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 712                         fprintf(stderr,"NO METADATA FILE, SKIPPING\n");
 713                         return;
 714                 }
 715                 metadata_ready = 1;
 716                 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 717         }
 718
 719
 720 end:
 721         return;
 722 #endif
 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 = 0;
 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 void *live_consume()
 839 {
 840         struct bt_context *bt_ctx = NULL;
 841         int ret;
 842
 843         while (1) {
 844 //              dump_snapshot();
 845
 846                 if (!metadata_ready) {
 847                         fprintf(stderr, "BLOCKING BEFORE METADATA\n");
 848                         sem_wait(&metadata_available);
 849                         fprintf(stderr,"OPENING TRACE\n");
 850                         if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 851                                 fprintf(stderr,"NO METADATA FILE, SKIPPING\n");
 852                                 return;
 853                         }
 854                         metadata_ready = 1;
 855                         metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 856                 }
 857
 858                 if (!trace_opened) {
 859                         bt_ctx = bt_context_create();
 860                         ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
 861                                         lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
 862                         trace_opened = 1;
 863                 }
 864                 iter_trace(bt_ctx);
 865                 sleep(1);
 866         }
 867 }
 868
 869 int setup_consumer(char *command_sock_path, pthread_t *threads,
 870                 struct lttng_consumer_local_data *ctx)
 871 {
 872         int ret = 0;
 873
 874         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 875                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 876         if (!ctx)
 877                 goto end;
 878
 879         unlink(command_sock_path);
 880         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 881         helper_lttng_consumer_init();
 882
 883         /* Create the thread to manage the receive of fd */
 884         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 885                         (void *) ctx);
 886         if (ret != 0) {
 887                 perror("pthread_create receive fd");
 888                 goto end;
 889         }
 890         /* Create thread to manage the polling/writing of traces */
 891         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 892                         (void *) ctx);
 893         if (ret != 0) {
 894                 perror("pthread_create poll fd");
 895                 goto end;
 896         }
 897
 898 end:
 899         return ret;
 900 }
 901
 902 void *setup_live_tracing()
 903 {
 904         struct lttng_domain dom;
 905         struct lttng_channel chan;
 906         char *channel_name = "mmapchan";
 907         struct lttng_event ev;
 908         int ret = 0;
 909         char *command_sock_path = "/tmp/consumerd_sock";
 910         static pthread_t threads[2]; /* recv_fd, poll */
 911         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 912
 913         struct lttng_handle *handle;
 914
 915         BT_INIT_LIST_HEAD(&mmap_list.head);
 916
 917         lttng_consumer_stream_array = g_ptr_array_new();
 918
 919         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 920                 fprintf(stderr,"error setting up consumer\n");
 921                 goto end;
 922         }
 923
 924         available_snapshots = g_ptr_array_new();
 925
 926         /* setup the session */
 927         dom.type = LTTNG_DOMAIN_KERNEL;
 928
 929         ret = system("rm -rf /tmp/livesession");
 930
 931         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 932                 fprintf(stderr,"error creating the session : %s\n",
 933                                 helper_lttcomm_get_readable_code(ret));
 934                 goto end;
 935         }
 936
 937         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 938                 fprintf(stderr,"error creating handle\n");
 939                 goto end;
 940         }
 941
 942         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 943                 fprintf(stderr,"error registering consumer : %s\n",
 944                                 helper_lttcomm_get_readable_code(ret));
 945                 goto end;
 946         }
 947
 948         strcpy(chan.name, channel_name);
 949         chan.attr.overwrite = 0;
 950         chan.attr.subbuf_size = 32768;
 951 //      chan.attr.subbuf_size = 1048576; /* 1MB */
 952         chan.attr.num_subbuf = 4;
 953         chan.attr.switch_timer_interval = 0;
 954         chan.attr.read_timer_interval = 200;
 955         chan.attr.output = LTTNG_EVENT_MMAP;
 956
 957         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
 958                 fprintf(stderr,"error creating channel : %s\n", helper_lttcomm_get_readable_code(ret));
 959                 goto end;
 960         }
 961
 962         sprintf(ev.name, "sched_switch");
 963         ev.type = LTTNG_EVENT_TRACEPOINT;
 964
 965         //if ((ret = lttng_enable_event(handle, NULL, channel_name)) < 0) {
 966         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 967                 fprintf(stderr,"error enabling event : %s\n", helper_lttcomm_get_readable_code(ret));
 968                 goto end;
 969         }
 970
 971         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
 972         lttng_add_context(handle, &kctxpid, NULL, NULL);
 973         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
 974         lttng_add_context(handle, &kctxppid, NULL, NULL);
 975         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
 976         lttng_add_context(handle, &kctxcomm, NULL, NULL);
 977         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
 978         lttng_add_context(handle, &kctxtid, NULL, NULL);
 979
 980         if ((ret = lttng_start_tracing("test")) < 0) {
 981                 fprintf(stderr,"error starting tracing : %s\n", helper_lttcomm_get_readable_code(ret));
 982                 goto end;
 983         }
 984
 985         helper_kernctl_buffer_flush(consumerd_metadata);
 986
 987         /* Create thread to manage the polling/writing of traces */
 988         ret = pthread_create(&thread_live_consume, NULL, live_consume, NULL);
 989         if (ret != 0) {
 990                 perror("pthread_create");
 991                 goto end;
 992         }
 993
 994 //      pthread_cancel(live_trace_thread);
 995
 996         /* block until metadata is ready */
 997         sem_init(&metadata_available, 0, 0);
 998
 999         //init_lttngtop();
1000
1001 end:
1002         return ret;
1003 }
1004
1005 int main(int argc, char **argv)
1006 {
1007         int ret;
1008         struct bt_context *bt_ctx = NULL;
1009
1010         ret = parse_options(argc, argv);
1011         if (ret < 0) {
1012                 fprintf(stdout, "Error parsing options.\n\n");
1013                 usage(stdout);
1014                 exit(EXIT_FAILURE);
1015         } else if (ret > 0) {
1016                 exit(EXIT_SUCCESS);
1017         }
1018
1019         if (!opt_input_path) {
1020                 printf("live tracing enabled\n");
1021                 pthread_create(&live_trace_thread, NULL, setup_live_tracing, (void *) NULL);
1022                 sleep(20);
1023                 printf("STOPPING\n");
1024                 lttng_stop_tracing("test");
1025                 printf("DESTROYING\n");
1026                 lttng_destroy_session("test");
1027
1028                 printf("CANCELLING\n");
1029                 pthread_cancel(live_trace_thread);
1030                 goto end;
1031         } else {
1032                 init_lttngtop();
1033
1034                 bt_ctx = bt_context_create();
1035                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1036                 if (ret < 0) {
1037                         fprintf(stderr, "[error] Opening the trace\n");
1038                         goto end;
1039                 }
1040
1041                 ret = check_requirements(bt_ctx);
1042                 if (ret < 0) {
1043                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1044                         goto end;
1045                 }
1046                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1047                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1048
1049                 iter_trace(bt_ctx);
1050
1051                 quit = 1;
1052                 pthread_join(display_thread, NULL);
1053                 pthread_join(timer_thread, NULL);
1054         }
1055
1056 end:
1057         if (bt_ctx)
1058                 bt_context_put(bt_ctx);
1059
1060         return 0;
1061 }