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 int opt_textdump;
  55
  56 int quit = 0;
  57
  58 struct lttngtop *copy;
  59 pthread_t display_thread;
  60 pthread_t timer_thread;
  61
  62 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  63 unsigned long last_display_update = 0;
  64
  65 /* list of FDs available for being read with snapshots */
  66 struct mmap_stream_list mmap_list;
  67 GPtrArray *lttng_consumer_stream_array;
  68 int sessiond_metadata, consumerd_metadata;
  69 struct lttng_consumer_local_data *ctx = NULL;
  70 /* list of snapshots currently not consumed */
  71 GPtrArray *available_snapshots;
  72 sem_t metadata_available;
  73 FILE *metadata_fp;
  74 int trace_opened = 0;
  75 int metadata_ready = 0;
  76
  77 enum {
  78         OPT_NONE = 0,
  79         OPT_HELP,
  80         OPT_TEXTDUMP,
  81 };
  82
  83 static struct poptOption long_options[] = {
  84         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  85         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  86         { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
  87         { NULL, 0, 0, NULL, 0, NULL, NULL },
  88 };
  89
  90 void *refresh_thread(void *p)
  91 {
  92         struct mmap_stream *mmap_info;
  93
  94         while (1) {
  95                 if (quit) {
  96                         sem_post(&pause_sem);
  97                         sem_post(&timer);
  98                         sem_post(&goodtodisplay);
  99                         pthread_exit(0);
 100                 }
 101                 bt_list_for_each_entry(mmap_info, &mmap_list.head, list)
 102                         helper_kernctl_buffer_flush(mmap_info->fd);
 103                 sem_wait(&pause_sem);
 104                 sem_post(&pause_sem);
 105                 sem_post(&timer);
 106                 sleep(refresh_display/NSEC_PER_SEC);
 107         }
 108 }
 109
 110 void *ncurses_display(void *p)
 111 {
 112         unsigned int current_display_index = 0;
 113
 114         sem_wait(&bootstrap);
 115         /*
 116          * Prevent the 1 second delay when we hit ESC
 117          */
 118         ESCDELAY = 0;
 119         init_ncurses();
 120
 121         while (1) {
 122                 sem_wait(&timer);
 123                 sem_wait(&goodtodisplay);
 124                 sem_wait(&pause_sem);
 125
 126                 if (quit) {
 127                         reset_ncurses();
 128                         pthread_exit(0);
 129                 }
 130
 131
 132                 copy = g_ptr_array_index(copies, current_display_index);
 133                 assert(copy);
 134                 display(current_display_index++);
 135
 136                 sem_post(&goodtoupdate);
 137                 sem_post(&pause_sem);
 138         }
 139 }
 140
 141 /*
 142  * hook on each event to check the timestamp and refresh the display if
 143  * necessary
 144  */
 145 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
 146 {
 147         unsigned long timestamp;
 148         struct tm start;
 149         uint64_t ts_nsec_start;
 150
 151         timestamp = bt_ctf_get_timestamp(call_data);
 152
 153         start = format_timestamp(timestamp);
 154         ts_nsec_start = timestamp % NSEC_PER_SEC;
 155
 156         printf("%02d:%02d:%02d.%09" PRIu64 " %s\n", start.tm_hour,
 157                         start.tm_min, start.tm_sec, ts_nsec_start,
 158                         bt_ctf_event_name(call_data));
 159
 160         return BT_CB_OK;
 161 }
 162
 163 /*
 164  * hook on each event to check the timestamp and refresh the display if
 165  * necessary
 166  */
 167 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 168 {
 169         unsigned long timestamp;
 170
 171         timestamp = bt_ctf_get_timestamp(call_data);
 172         if (timestamp == -1ULL)
 173                 goto error;
 174
 175         if (last_display_update == 0)
 176                 last_display_update = timestamp;
 177
 178         if (timestamp - last_display_update >= refresh_display) {
 179                 sem_wait(&goodtoupdate);
 180                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 181                                         timestamp));
 182                 sem_post(&goodtodisplay);
 183                 sem_post(&bootstrap);
 184                 last_display_update = timestamp;
 185         }
 186         return BT_CB_OK;
 187
 188 error:
 189         fprintf(stderr, "check_timestamp callback error\n");
 190         return BT_CB_ERROR_STOP;
 191 }
 192
 193 /*
 194  * get_perf_counter : get or create and return a perf_counter struct for
 195  * either a process or a cpu (only one of the 2 parameters mandatory)
 196  */
 197 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 198                 struct cputime *cpu)
 199 {
 200         struct perfcounter *ret;
 201         GHashTable *table;
 202
 203         if (proc)
 204                 table = proc->perf;
 205         else if (cpu)
 206                 table = cpu->perf;
 207         else
 208                 goto error;
 209
 210         ret = g_hash_table_lookup(table, (gpointer) name);
 211         if (ret)
 212                 goto end;
 213
 214         ret = g_new0(struct perfcounter, 1);
 215         /* by default, make it visible in the UI */
 216         ret->visible = 1;
 217         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 218
 219 end:
 220         return ret;
 221
 222 error:
 223         return NULL;
 224 }
 225
 226 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 227                 const char *name, int value)
 228 {
 229         struct perfcounter *cpu_perf, *process_perf;
 230
 231         cpu_perf = get_perf_counter(name, NULL, cpu);
 232         if (cpu_perf->count < value) {
 233                 process_perf = get_perf_counter(name, proc, NULL);
 234                 process_perf->count += value - cpu_perf->count;
 235                 cpu_perf->count = value;
 236         }
 237 }
 238
 239 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 240                 const struct bt_definition *scope,
 241                 struct processtop *proc,
 242                 struct cputime *cpu)
 243 {
 244         struct bt_definition const * const *list = NULL;
 245         const struct bt_definition *field;
 246         unsigned int count;
 247         struct perfcounter *perfcounter;
 248         GHashTableIter iter;
 249         gpointer key;
 250         int ret;
 251
 252         if (!scope)
 253                 goto end;
 254
 255         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 256         if (ret < 0)
 257                 goto end;
 258
 259         if (count == 0)
 260                 goto end;
 261
 262         g_hash_table_iter_init(&iter, global_perf_liszt);
 263         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 264                 field = bt_ctf_get_field(event, scope, (char *) key);
 265                 if (field) {
 266                         int value = bt_ctf_get_uint64(field);
 267                         if (bt_ctf_field_get_error())
 268                                 continue;
 269                         update_perf_value(proc, cpu, (char *) key, value);
 270                 }
 271         }
 272
 273 end:
 274         return;
 275 }
 276
 277 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 278 {
 279         struct cputime *cpu;
 280         const struct bt_definition *scope;
 281
 282         cpu = get_cpu(get_cpu_id(event));
 283
 284         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 285         extract_perf_counter_scope(event, scope, proc, cpu);
 286
 287         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 288         extract_perf_counter_scope(event, scope, proc, cpu);
 289
 290         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 291         extract_perf_counter_scope(event, scope, proc, cpu);
 292 }
 293
 294 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 295                 void *private_data)
 296 {
 297         int pid, tid, ppid;
 298         char *comm;
 299         struct processtop *parent, *child;
 300         unsigned long timestamp;
 301
 302         timestamp = bt_ctf_get_timestamp(call_data);
 303         if (timestamp == -1ULL)
 304                 goto error;
 305
 306         pid = get_context_pid(call_data);
 307         if (pid == -1ULL) {
 308                 goto error;
 309         }
 310         tid = get_context_tid(call_data);
 311         if (tid == -1ULL) {
 312                 goto error;
 313         }
 314         ppid = get_context_ppid(call_data);
 315         if (ppid == -1ULL) {
 316                 goto error;
 317         }
 318         comm = get_context_comm(call_data);
 319         if (!comm) {
 320                 goto error;
 321         }
 322
 323         /* find or create the current process */
 324         child = find_process_tid(&lttngtop, tid, comm);
 325         if (!child)
 326                 child = add_proc(&lttngtop, tid, comm, timestamp);
 327         update_proc(child, pid, tid, ppid, comm);
 328
 329         if (pid != tid) {
 330                 /* find or create the parent */
 331                 parent = find_process_tid(&lttngtop, pid, comm);
 332                 if (!parent) {
 333                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 334                         parent->pid = pid;
 335                 }
 336
 337                 /* attach the parent to the current process */
 338                 child->threadparent = parent;
 339                 add_thread(parent, child);
 340         }
 341
 342         update_perf_counter(child, call_data);
 343
 344         return BT_CB_OK;
 345
 346 error:
 347         return BT_CB_ERROR_STOP;
 348 }
 349
 350 void init_lttngtop()
 351 {
 352         copies = g_ptr_array_new();
 353         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 354
 355         sem_init(&goodtodisplay, 0, 0);
 356         sem_init(&goodtoupdate, 0, 1);
 357         sem_init(&timer, 0, 1);
 358         sem_init(&bootstrap, 0, 0);
 359         sem_init(&pause_sem, 0, 1);
 360         sem_init(&end_trace_sem, 0, 0);
 361
 362         reset_global_counters();
 363         lttngtop.nbproc = 0;
 364         lttngtop.nbthreads = 0;
 365         lttngtop.nbfiles = 0;
 366
 367         lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
 368                         g_direct_equal);
 369         lttngtop.process_table = g_ptr_array_new();
 370         lttngtop.files_table = g_ptr_array_new();
 371         lttngtop.cpu_table = g_ptr_array_new();
 372 }
 373
 374 void usage(FILE *fp)
 375 {
 376         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 377         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 378 }
 379
 380 /*
 381  * Return 0 if caller should continue, < 0 if caller should return
 382  * error, > 0 if caller should exit without reporting error.
 383  */
 384 static int parse_options(int argc, char **argv)
 385 {
 386         poptContext pc;
 387         int opt, ret = 0;
 388
 389         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 390         poptReadDefaultConfig(pc, 0);
 391
 392         while ((opt = poptGetNextOpt(pc)) != -1) {
 393                 switch (opt) {
 394                         case OPT_HELP:
 395                                 usage(stdout);
 396                                 ret = 1;    /* exit cleanly */
 397                                 goto end;
 398                         case OPT_TEXTDUMP:
 399                                 opt_textdump = 1;
 400                                 goto end;
 401                         default:
 402                                 ret = -EINVAL;
 403                                 goto end;
 404                 }
 405         }
 406
 407         opt_input_path = poptGetArg(pc);
 408
 409 end:
 410         if (pc) {
 411                 poptFreeContext(pc);
 412         }
 413         return ret;
 414 }
 415
 416 void iter_trace(struct bt_context *bt_ctx)
 417 {
 418         struct bt_ctf_iter *iter;
 419         struct bt_iter_pos begin_pos;
 420         const struct bt_ctf_event *event;
 421         int ret = 0;
 422
 423         begin_pos.type = BT_SEEK_BEGIN;
 424         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 425
 426         if (opt_textdump) {
 427                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 428                                 print_timestamp,
 429                                 NULL, NULL, NULL);
 430         } else {
 431                 /* at each event check if we need to refresh */
 432                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 433                                 check_timestamp,
 434                                 NULL, NULL, NULL);
 435                 /* at each event, verify the status of the process table */
 436                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 437                                 fix_process_table,
 438                                 NULL, NULL, NULL);
 439                 /* to handle the scheduling events */
 440                 bt_ctf_iter_add_callback(iter,
 441                                 g_quark_from_static_string("sched_switch"),
 442                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 443                 /* to clean up the process table */
 444                 bt_ctf_iter_add_callback(iter,
 445                                 g_quark_from_static_string("sched_process_free"),
 446                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 447                 /* to get all the process from the statedumps */
 448                 bt_ctf_iter_add_callback(iter,
 449                                 g_quark_from_static_string(
 450                                         "lttng_statedump_process_state"),
 451                                 NULL, 0, handle_statedump_process_state,
 452                                 NULL, NULL, NULL);
 453
 454                 /* for IO top */
 455                 bt_ctf_iter_add_callback(iter,
 456                                 g_quark_from_static_string("exit_syscall"),
 457                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 458                 bt_ctf_iter_add_callback(iter,
 459                                 g_quark_from_static_string("sys_write"),
 460                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 461                 bt_ctf_iter_add_callback(iter,
 462                                 g_quark_from_static_string("sys_read"),
 463                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 464                 bt_ctf_iter_add_callback(iter,
 465                                 g_quark_from_static_string("sys_open"),
 466                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 467                 bt_ctf_iter_add_callback(iter,
 468                                 g_quark_from_static_string("sys_close"),
 469                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 470                 bt_ctf_iter_add_callback(iter,
 471                                 g_quark_from_static_string(
 472                                         "lttng_statedump_file_descriptor"),
 473                                 NULL, 0, handle_statedump_file_descriptor,
 474                                 NULL, NULL, NULL);
 475         }
 476
 477         while (((event = bt_ctf_iter_read_event(iter)) != NULL)) {
 478                 if (quit)
 479                         goto end_iter;
 480                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 481                 if (ret < 0)
 482                         goto end_iter;
 483         }
 484
 485         /* block until quit, we reached the end of the trace */
 486         sem_wait(&end_trace_sem);
 487
 488 end_iter:
 489         bt_ctf_iter_destroy(iter);
 490 }
 491
 492 /*
 493  * bt_context_add_traces_recursive: Open a trace recursively
 494  * (copied from BSD code in converter/babeltrace.c)
 495  *
 496  * Find each trace present in the subdirectory starting from the given
 497  * path, and add them to the context. The packet_seek parameter can be
 498  * NULL: this specify to use the default format packet_seek.
 499  *
 500  * Return: 0 on success, nonzero on failure.
 501  * Unable to open toplevel: failure.
 502  * Unable to open some subdirectory or file: warn and continue;
 503  */
 504 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 505                 const char *format_str,
 506                 void (*packet_seek)(struct bt_stream_pos *pos,
 507                         size_t offset, int whence))
 508 {
 509         FTS *tree;
 510         FTSENT *node;
 511         GArray *trace_ids;
 512         char lpath[PATH_MAX];
 513         char * const paths[2] = { lpath, NULL };
 514         int ret = -1;
 515
 516         /*
 517          * Need to copy path, because fts_open can change it.
 518          * It is the pointer array, not the strings, that are constant.
 519          */
 520         strncpy(lpath, path, PATH_MAX);
 521         lpath[PATH_MAX - 1] = '\0';
 522
 523         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 524         if (tree == NULL) {
 525                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 526                                 path);
 527                 return -EINVAL;
 528         }
 529
 530         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 531
 532         while ((node = fts_read(tree))) {
 533                 int dirfd, metafd;
 534
 535                 if (!(node->fts_info & FTS_D))
 536                         continue;
 537
 538                 dirfd = open(node->fts_accpath, 0);
 539                 if (dirfd < 0) {
 540                         fprintf(stderr, "[error] [Context] Unable to open trace "
 541                                 "directory file descriptor.\n");
 542                         ret = dirfd;
 543                         goto error;
 544                 }
 545                 metafd = openat(dirfd, "metadata", O_RDONLY);
 546                 if (metafd < 0) {
 547                         close(dirfd);
 548                         ret = -1;
 549                         continue;
 550                 } else {
 551                         int trace_id;
 552
 553                         ret = close(metafd);
 554                         if (ret < 0) {
 555                                 perror("close");
 556                                 goto error;
 557                         }
 558                         ret = close(dirfd);
 559                         if (ret < 0) {
 560                                 perror("close");
 561                                 goto error;
 562                         }
 563
 564                         trace_id = bt_context_add_trace(ctx,
 565                                 node->fts_accpath, format_str,
 566                                 packet_seek, NULL, NULL);
 567                         if (trace_id < 0) {
 568                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 569                                         "for reading.\n", node->fts_accpath, path);
 570                                 /* Allow to skip erroneous traces. */
 571                                 continue;
 572                         }
 573                         g_array_append_val(trace_ids, trace_id);
 574                 }
 575         }
 576
 577         g_array_free(trace_ids, TRUE);
 578         return ret;
 579
 580 error:
 581         return ret;
 582 }
 583
 584 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 585                 int field_cnt, int *tid_check, int *pid_check,
 586                 int *procname_check, int *ppid_check)
 587 {
 588         int j;
 589         struct perfcounter *global;
 590         const char *name;
 591
 592         for (j = 0; j < field_cnt; j++) {
 593                 name = bt_ctf_get_decl_field_name(field_list[j]);
 594                 if (*tid_check == 0) {
 595                         if (strncmp(name, "tid", 3) == 0)
 596                                 (*tid_check)++;
 597                 }
 598                 if (*pid_check == 0) {
 599                         if (strncmp(name, "pid", 3) == 0)
 600                                 (*pid_check)++;
 601                 }
 602                 if (*ppid_check == 0) {
 603                         if (strncmp(name, "ppid", 4) == 0)
 604                                 (*ppid_check)++;
 605                 }
 606                 if (*procname_check == 0) {
 607                         if (strncmp(name, "procname", 8) == 0)
 608                                 (*procname_check)++;
 609                 }
 610                 if (strncmp(name, "perf_", 5) == 0) {
 611                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 612                         if (!global) {
 613                                 global = g_new0(struct perfcounter, 1);
 614                                 /* by default, sort on the first perf context */
 615                                 if (g_hash_table_size(global_perf_liszt) == 0)
 616                                         global->sort = 1;
 617                                 global->visible = 1;
 618                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 619                         }
 620                 }
 621         }
 622
 623         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 624                         *procname_check == 1)
 625                 return 0;
 626
 627         return -1;
 628 }
 629
 630 /*
 631  * check_requirements: check if the required context informations are available
 632  *
 633  * If each mandatory context information is available for at least in one
 634  * event, return 0 otherwise return -1.
 635  */
 636 int check_requirements(struct bt_context *ctx)
 637 {
 638         unsigned int i, evt_cnt, field_cnt;
 639         struct bt_ctf_event_decl *const * evt_list;
 640         const struct bt_ctf_field_decl *const * field_list;
 641         int tid_check = 0;
 642         int pid_check = 0;
 643         int procname_check = 0;
 644         int ppid_check = 0;
 645         int ret = 0;
 646
 647         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 648         for (i = 0; i < evt_cnt; i++) {
 649                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 650                                 &field_list, &field_cnt);
 651                 ret = check_field_requirements(field_list, field_cnt,
 652                                 &tid_check, &pid_check, &procname_check,
 653                                 &ppid_check);
 654
 655                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 656                                 &field_list, &field_cnt);
 657                 ret = check_field_requirements(field_list, field_cnt,
 658                                 &tid_check, &pid_check, &procname_check,
 659                                 &ppid_check);
 660
 661                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 662                                 &field_list, &field_cnt);
 663                 ret = check_field_requirements(field_list, field_cnt,
 664                                 &tid_check, &pid_check, &procname_check,
 665                                 &ppid_check);
 666         }
 667
 668         if (tid_check == 0) {
 669                 ret = -1;
 670                 fprintf(stderr, "[error] missing tid context information\n");
 671         }
 672         if (pid_check == 0) {
 673                 ret = -1;
 674                 fprintf(stderr, "[error] missing pid context information\n");
 675         }
 676         if (ppid_check == 0) {
 677                 ret = -1;
 678                 fprintf(stderr, "[error] missing ppid context information\n");
 679         }
 680         if (procname_check == 0) {
 681                 ret = -1;
 682                 fprintf(stderr, "[error] missing procname context information\n");
 683         }
 684
 685         return ret;
 686 }
 687
 688 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 689                 struct lttng_consumer_local_data *ctx)
 690 {
 691         unsigned long len;
 692         int err;
 693         long ret = 0;
 694         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 695
 696         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 697                 /* Get the next subbuffer */
 698                 err = helper_kernctl_get_next_subbuf(infd);
 699                 if (err != 0) {
 700                         ret = errno;
 701                         perror("Reserving sub buffer failed (everything is normal, "
 702                                         "it is due to concurrency)");
 703                         goto end;
 704                 }
 705                 /* read the whole subbuffer */
 706                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 707                 if (err != 0) {
 708                         ret = errno;
 709                         perror("Getting sub-buffer len failed.");
 710                         goto end;
 711                 }
 712
 713                 /* splice the subbuffer to the tracefile */
 714                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 715                 if (ret < 0) {
 716                         /*
 717                          * display the error but continue processing to try
 718                          * to release the subbuffer
 719                          */
 720                         fprintf(stderr,"Error splicing to tracefile\n");
 721                 }
 722                 err = helper_kernctl_put_next_subbuf(infd);
 723                 if (err != 0) {
 724                         ret = errno;
 725                         perror("Reserving sub buffer failed (everything is normal, "
 726                                         "it is due to concurrency)");
 727                         goto end;
 728                 }
 729                 sem_post(&metadata_available);
 730         }
 731
 732 end:
 733         return 0;
 734 }
 735
 736 int on_update_fd(int key, uint32_t state)
 737 {
 738         /* let the lib handle the metadata FD */
 739         if (key == sessiond_metadata)
 740                 return 0;
 741         return 1;
 742 }
 743
 744 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
 745 {
 746         int ret;
 747         struct mmap_stream *new_mmap_stream;
 748
 749         /* Opening the tracefile in write mode */
 750         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
 751                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
 752                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
 753                 if (ret < 0) {
 754                         perror("open");
 755                         goto end;
 756                 }
 757                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
 758         }
 759
 760         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
 761                 new_mmap_stream = malloc(sizeof(struct mmap_stream));
 762                 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
 763                                 kconsumerd_fd);
 764                 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
 765
 766                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
 767                 /* keep mmap FDs internally */
 768                 ret = 1;
 769         } else {
 770                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 771                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
 772                 ret = 0;
 773         }
 774
 775 end:
 776         return ret;
 777 }
 778
 779 void live_consume(struct bt_context **bt_ctx)
 780 {
 781         int ret;
 782
 783         if (!metadata_ready) {
 784                 sem_wait(&metadata_available);
 785                 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 786                         fprintf(stderr,"no metadata\n");
 787                         goto end;
 788                 }
 789                 metadata_ready = 1;
 790                 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 791         }
 792
 793         if (!trace_opened) {
 794                 *bt_ctx = bt_context_create();
 795                 ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
 796                                 lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
 797                 if (ret < 0) {
 798                         printf("Error adding trace\n");
 799                         goto end;
 800                 }
 801                 trace_opened = 1;
 802         }
 803
 804 end:
 805         return;
 806 }
 807
 808 int setup_consumer(char *command_sock_path, pthread_t *threads,
 809                 struct lttng_consumer_local_data *ctx)
 810 {
 811         int ret = 0;
 812
 813         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 814                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 815         if (!ctx)
 816                 goto end;
 817
 818         unlink(command_sock_path);
 819         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 820         helper_lttng_consumer_init();
 821
 822         /* Create the thread to manage the receive of fd */
 823         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 824                         (void *) ctx);
 825         if (ret != 0) {
 826                 perror("pthread_create receive fd");
 827                 goto end;
 828         }
 829         /* Create thread to manage the polling/writing of traces */
 830         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 831                         (void *) ctx);
 832         if (ret != 0) {
 833                 perror("pthread_create poll fd");
 834                 goto end;
 835         }
 836
 837 end:
 838         return ret;
 839 }
 840
 841 void *setup_live_tracing()
 842 {
 843         struct lttng_domain dom;
 844         struct lttng_channel chan;
 845         char *channel_name = "mmapchan";
 846         struct lttng_event ev;
 847         int ret = 0;
 848         char *command_sock_path = "/tmp/consumerd_sock";
 849         static pthread_t threads[2]; /* recv_fd, poll */
 850         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 851
 852         struct lttng_handle *handle;
 853
 854         BT_INIT_LIST_HEAD(&mmap_list.head);
 855
 856         lttng_consumer_stream_array = g_ptr_array_new();
 857
 858         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 859                 fprintf(stderr,"error setting up consumer\n");
 860                 goto end;
 861         }
 862
 863         available_snapshots = g_ptr_array_new();
 864
 865         /* setup the session */
 866         dom.type = LTTNG_DOMAIN_KERNEL;
 867
 868         ret = unlink("/tmp/livesession");
 869
 870         lttng_destroy_session("test");
 871         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 872                 fprintf(stderr,"error creating the session : %s\n",
 873                                 helper_lttcomm_get_readable_code(ret));
 874                 goto end;
 875         }
 876
 877         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 878                 fprintf(stderr,"error creating handle\n");
 879                 goto end;
 880         }
 881
 882         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 883                 fprintf(stderr,"error registering consumer : %s\n",
 884                                 helper_lttcomm_get_readable_code(ret));
 885                 goto end;
 886         }
 887
 888         strcpy(chan.name, channel_name);
 889         chan.attr.overwrite = 0;
 890 //      chan.attr.subbuf_size = 32768;
 891         chan.attr.subbuf_size = 1048576; /* 1MB */
 892         chan.attr.num_subbuf = 4;
 893         chan.attr.switch_timer_interval = 0;
 894         chan.attr.read_timer_interval = 200;
 895         chan.attr.output = LTTNG_EVENT_MMAP;
 896
 897         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
 898                 fprintf(stderr,"error creating channel : %s\n",
 899                                 helper_lttcomm_get_readable_code(ret));
 900                 goto end;
 901         }
 902
 903         memset(&ev, '\0', sizeof(struct lttng_event));
 904         //sprintf(ev.name, "sched_switch");
 905         ev.type = LTTNG_EVENT_TRACEPOINT;
 906         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 907                 fprintf(stderr,"error enabling event : %s\n",
 908                                 helper_lttcomm_get_readable_code(ret));
 909                 goto end;
 910         }
 911
 912         ev.type = LTTNG_EVENT_SYSCALL;
 913         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 914                 fprintf(stderr,"error enabling syscalls : %s\n",
 915                                 helper_lttcomm_get_readable_code(ret));
 916                 goto end;
 917         }
 918
 919         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
 920         lttng_add_context(handle, &kctxpid, NULL, NULL);
 921         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
 922         lttng_add_context(handle, &kctxppid, NULL, NULL);
 923         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
 924         lttng_add_context(handle, &kctxcomm, NULL, NULL);
 925         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
 926         lttng_add_context(handle, &kctxtid, NULL, NULL);
 927
 928         if ((ret = lttng_start_tracing("test")) < 0) {
 929                 fprintf(stderr,"error starting tracing : %s\n",
 930                                 helper_lttcomm_get_readable_code(ret));
 931                 goto end;
 932         }
 933
 934         helper_kernctl_buffer_flush(consumerd_metadata);
 935
 936         /* block until metadata is ready */
 937         sem_init(&metadata_available, 0, 0);
 938
 939 end:
 940         return NULL;
 941 }
 942
 943 int main(int argc, char **argv)
 944 {
 945         int ret;
 946         struct bt_context *bt_ctx = NULL;
 947
 948         ret = parse_options(argc, argv);
 949         if (ret < 0) {
 950                 fprintf(stdout, "Error parsing options.\n\n");
 951                 usage(stdout);
 952                 exit(EXIT_FAILURE);
 953         } else if (ret > 0) {
 954                 exit(EXIT_SUCCESS);
 955         }
 956
 957         if (!opt_input_path) {
 958                 setup_live_tracing();
 959                 init_lttngtop();
 960                 if (!opt_textdump) {
 961                         pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
 962                         pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
 963                 }
 964                 live_consume(&bt_ctx);
 965                 iter_trace(bt_ctx);
 966
 967                 pthread_join(timer_thread, NULL);
 968                 quit = 1;
 969                 pthread_join(display_thread, NULL);
 970
 971                 lttng_stop_tracing("test");
 972                 lttng_destroy_session("test");
 973
 974                 goto end;
 975         } else {
 976                 init_lttngtop();
 977
 978                 bt_ctx = bt_context_create();
 979                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
 980                 if (ret < 0) {
 981                         fprintf(stderr, "[error] Opening the trace\n");
 982                         goto end;
 983                 }
 984
 985                 ret = check_requirements(bt_ctx);
 986                 if (ret < 0) {
 987                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
 988                         goto end;
 989                 }
 990                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
 991                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
 992
 993                 iter_trace(bt_ctx);
 994
 995                 pthread_join(display_thread, NULL);
 996                 quit = 1;
 997                 pthread_join(timer_thread, NULL);
 998         }
 999
1000 end:
1001         if (bt_ctx)
1002                 bt_context_put(bt_ctx);
1003
1004         return 0;
1005 }