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 struct lttngtop *copy;
  57 pthread_t display_thread;
  58 pthread_t timer_thread;
  59
  60 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  61 unsigned long last_display_update = 0;
  62 int quit = 0;
  63
  64 /* list of FDs available for being read with snapshots */
  65 struct mmap_stream_list mmap_list;
  66 GPtrArray *lttng_consumer_stream_array;
  67 int sessiond_metadata, consumerd_metadata;
  68 struct lttng_consumer_local_data *ctx = NULL;
  69 /* list of snapshots currently not consumed */
  70 GPtrArray *available_snapshots;
  71 sem_t metadata_available;
  72 FILE *metadata_fp;
  73 int trace_opened = 0;
  74 int metadata_ready = 0;
  75
  76 enum {
  77         OPT_NONE = 0,
  78         OPT_HELP,
  79         OPT_TEXTDUMP,
  80 };
  81
  82 static struct poptOption long_options[] = {
  83         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  84         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  85         { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
  86         { NULL, 0, 0, NULL, 0, NULL, NULL },
  87 };
  88
  89 void *refresh_thread(void *p)
  90 {
  91         while (1) {
  92                 if (quit)
  93                         return NULL;
  94                 sem_wait(&pause_sem);
  95                 sem_post(&pause_sem);
  96                 sem_post(&timer);
  97                 sleep(refresh_display/NSEC_PER_SEC);
  98         }
  99 }
 100
 101 void *ncurses_display(void *p)
 102 {
 103         unsigned int current_display_index = 0;
 104
 105         sem_wait(&bootstrap);
 106         /*
 107          * Prevent the 1 second delay when we hit ESC
 108          */
 109         ESCDELAY = 0;
 110         init_ncurses();
 111
 112         while (1) {
 113                 sem_wait(&timer);
 114                 sem_wait(&goodtodisplay);
 115                 sem_wait(&pause_sem);
 116
 117                 copy = g_ptr_array_index(copies, current_display_index);
 118                 assert(copy);
 119                 display(current_display_index++);
 120
 121                 sem_post(&goodtoupdate);
 122                 sem_post(&pause_sem);
 123
 124                 if (quit) {
 125                         reset_ncurses();
 126                         pthread_exit(0);
 127                 }
 128         }
 129 }
 130
 131 /*
 132  * hook on each event to check the timestamp and refresh the display if
 133  * necessary
 134  */
 135 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
 136 {
 137         unsigned long timestamp;
 138         struct tm start;
 139         uint64_t ts_nsec_start;
 140
 141
 142         timestamp = bt_ctf_get_timestamp(call_data);
 143
 144         start = format_timestamp(timestamp);
 145         ts_nsec_start = timestamp % NSEC_PER_SEC;
 146
 147         printf("%02d:%02d:%02d.%09" PRIu64 " %s\n", start.tm_hour,
 148                         start.tm_min, start.tm_sec, ts_nsec_start,
 149                         bt_ctf_event_name(call_data));
 150
 151         return BT_CB_OK;
 152 }
 153
 154 /*
 155  * hook on each event to check the timestamp and refresh the display if
 156  * necessary
 157  */
 158 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 159 {
 160         unsigned long timestamp;
 161
 162         timestamp = bt_ctf_get_timestamp(call_data);
 163         if (timestamp == -1ULL)
 164                 goto error;
 165
 166         if (last_display_update == 0)
 167                 last_display_update = timestamp;
 168
 169         if (timestamp - last_display_update >= refresh_display) {
 170                 sem_wait(&goodtoupdate);
 171                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 172                                         timestamp));
 173                 sem_post(&goodtodisplay);
 174                 sem_post(&bootstrap);
 175                 last_display_update = timestamp;
 176         }
 177         return BT_CB_OK;
 178
 179 error:
 180         fprintf(stderr, "check_timestamp callback error\n");
 181         return BT_CB_ERROR_STOP;
 182 }
 183
 184 /*
 185  * get_perf_counter : get or create and return a perf_counter struct for
 186  * either a process or a cpu (only one of the 2 parameters mandatory)
 187  */
 188 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 189                 struct cputime *cpu)
 190 {
 191         struct perfcounter *ret;
 192         GHashTable *table;
 193
 194         if (proc)
 195                 table = proc->perf;
 196         else if (cpu)
 197                 table = cpu->perf;
 198         else
 199                 goto error;
 200
 201         ret = g_hash_table_lookup(table, (gpointer) name);
 202         if (ret)
 203                 goto end;
 204
 205         ret = g_new0(struct perfcounter, 1);
 206         /* by default, make it visible in the UI */
 207         ret->visible = 1;
 208         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 209
 210 end:
 211         return ret;
 212
 213 error:
 214         return NULL;
 215 }
 216
 217 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 218                 const char *name, int value)
 219 {
 220         struct perfcounter *cpu_perf, *process_perf;
 221
 222         cpu_perf = get_perf_counter(name, NULL, cpu);
 223         if (cpu_perf->count < value) {
 224                 process_perf = get_perf_counter(name, proc, NULL);
 225                 process_perf->count += value - cpu_perf->count;
 226                 cpu_perf->count = value;
 227         }
 228 }
 229
 230 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 231                 const struct bt_definition *scope,
 232                 struct processtop *proc,
 233                 struct cputime *cpu)
 234 {
 235         struct bt_definition const * const *list = NULL;
 236         const struct bt_definition *field;
 237         unsigned int count;
 238         struct perfcounter *perfcounter;
 239         GHashTableIter iter;
 240         gpointer key;
 241         int ret;
 242
 243         if (!scope)
 244                 goto end;
 245
 246         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 247         if (ret < 0)
 248                 goto end;
 249
 250         if (count == 0)
 251                 goto end;
 252
 253         g_hash_table_iter_init(&iter, global_perf_liszt);
 254         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 255                 field = bt_ctf_get_field(event, scope, (char *) key);
 256                 if (field) {
 257                         int value = bt_ctf_get_uint64(field);
 258                         if (bt_ctf_field_get_error())
 259                                 continue;
 260                         update_perf_value(proc, cpu, (char *) key, value);
 261                 }
 262         }
 263
 264 end:
 265         return;
 266 }
 267
 268 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 269 {
 270         struct cputime *cpu;
 271         const struct bt_definition *scope;
 272
 273         cpu = get_cpu(get_cpu_id(event));
 274
 275         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 276         extract_perf_counter_scope(event, scope, proc, cpu);
 277
 278         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 279         extract_perf_counter_scope(event, scope, proc, cpu);
 280
 281         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 282         extract_perf_counter_scope(event, scope, proc, cpu);
 283 }
 284
 285 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 286                 void *private_data)
 287 {
 288         int pid, tid, ppid;
 289         char *comm;
 290         struct processtop *parent, *child;
 291         unsigned long timestamp;
 292
 293         timestamp = bt_ctf_get_timestamp(call_data);
 294         if (timestamp == -1ULL)
 295                 goto error;
 296
 297         pid = get_context_pid(call_data);
 298         if (pid == -1ULL) {
 299                 goto error;
 300         }
 301         tid = get_context_tid(call_data);
 302         if (tid == -1ULL) {
 303                 goto error;
 304         }
 305         ppid = get_context_ppid(call_data);
 306         if (ppid == -1ULL) {
 307                 goto error;
 308         }
 309         comm = get_context_comm(call_data);
 310         if (!comm) {
 311                 goto error;
 312         }
 313
 314         /* find or create the current process */
 315         child = find_process_tid(&lttngtop, tid, comm);
 316         if (!child)
 317                 child = add_proc(&lttngtop, tid, comm, timestamp);
 318         update_proc(child, pid, tid, ppid, comm);
 319
 320         if (pid != tid) {
 321                 /* find or create the parent */
 322                 parent = find_process_tid(&lttngtop, pid, comm);
 323                 if (!parent) {
 324                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 325                         parent->pid = pid;
 326                 }
 327
 328                 /* attach the parent to the current process */
 329                 child->threadparent = parent;
 330                 add_thread(parent, child);
 331         }
 332
 333         update_perf_counter(child, call_data);
 334
 335         return BT_CB_OK;
 336
 337 error:
 338         return BT_CB_ERROR_STOP;
 339 }
 340
 341 void init_lttngtop()
 342 {
 343         copies = g_ptr_array_new();
 344         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 345
 346         sem_init(&goodtodisplay, 0, 0);
 347         sem_init(&goodtoupdate, 0, 1);
 348         sem_init(&timer, 0, 1);
 349         sem_init(&bootstrap, 0, 0);
 350         sem_init(&pause_sem, 0, 1);
 351         sem_init(&end_trace_sem, 0, 0);
 352
 353         reset_global_counters();
 354         lttngtop.nbproc = 0;
 355         lttngtop.nbthreads = 0;
 356         lttngtop.nbfiles = 0;
 357
 358         lttngtop.process_table = g_ptr_array_new();
 359         lttngtop.files_table = g_ptr_array_new();
 360         lttngtop.cpu_table = g_ptr_array_new();
 361 }
 362
 363 void usage(FILE *fp)
 364 {
 365         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 366         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 367 }
 368
 369 /*
 370  * Return 0 if caller should continue, < 0 if caller should return
 371  * error, > 0 if caller should exit without reporting error.
 372  */
 373 static int parse_options(int argc, char **argv)
 374 {
 375         poptContext pc;
 376         int opt, ret = 0;
 377
 378         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 379         poptReadDefaultConfig(pc, 0);
 380
 381         while ((opt = poptGetNextOpt(pc)) != -1) {
 382                 switch (opt) {
 383                         case OPT_HELP:
 384                                 usage(stdout);
 385                                 ret = 1;    /* exit cleanly */
 386                                 goto end;
 387                         case OPT_TEXTDUMP:
 388                                 opt_textdump = 1;
 389                                 goto end;
 390                         default:
 391                                 ret = -EINVAL;
 392                                 goto end;
 393                 }
 394         }
 395
 396         opt_input_path = poptGetArg(pc);
 397
 398 end:
 399         if (pc) {
 400                 poptFreeContext(pc);
 401         }
 402         return ret;
 403 }
 404
 405 void iter_trace(struct bt_context *bt_ctx)
 406 {
 407         struct bt_ctf_iter *iter;
 408         struct bt_iter_pos begin_pos;
 409         const struct bt_ctf_event *event;
 410         int ret = 0;
 411
 412         begin_pos.type = BT_SEEK_BEGIN;
 413         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 414
 415         if (opt_textdump) {
 416                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 417                                 print_timestamp,
 418                                 NULL, NULL, NULL);
 419         } else {
 420                 /* at each event check if we need to refresh */
 421                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 422                                 check_timestamp,
 423                                 NULL, NULL, NULL);
 424                 /* at each event, verify the status of the process table */
 425                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 426                                 fix_process_table,
 427                                 NULL, NULL, NULL);
 428                 /* to handle the scheduling events */
 429                 bt_ctf_iter_add_callback(iter,
 430                                 g_quark_from_static_string("sched_switch"),
 431                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 432                 /* to clean up the process table */
 433                 bt_ctf_iter_add_callback(iter,
 434                                 g_quark_from_static_string("sched_process_free"),
 435                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 436                 /* to get all the process from the statedumps */
 437                 bt_ctf_iter_add_callback(iter,
 438                                 g_quark_from_static_string(
 439                                         "lttng_statedump_process_state"),
 440                                 NULL, 0, handle_statedump_process_state,
 441                                 NULL, NULL, NULL);
 442
 443                 /* for IO top */
 444                 bt_ctf_iter_add_callback(iter,
 445                                 g_quark_from_static_string("exit_syscall"),
 446                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 447                 bt_ctf_iter_add_callback(iter,
 448                                 g_quark_from_static_string("sys_write"),
 449                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 450                 bt_ctf_iter_add_callback(iter,
 451                                 g_quark_from_static_string("sys_read"),
 452                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 453                 bt_ctf_iter_add_callback(iter,
 454                                 g_quark_from_static_string("sys_open"),
 455                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 456                 bt_ctf_iter_add_callback(iter,
 457                                 g_quark_from_static_string("sys_close"),
 458                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 459                 bt_ctf_iter_add_callback(iter,
 460                                 g_quark_from_static_string(
 461                                         "lttng_statedump_file_descriptor"),
 462                                 NULL, 0, handle_statedump_file_descriptor,
 463                                 NULL, NULL, NULL);
 464         }
 465
 466         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 467                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 468                 if (ret < 0)
 469                         goto end_iter;
 470         }
 471
 472         /* block until quit, we reached the end of the trace */
 473         sem_wait(&end_trace_sem);
 474
 475 end_iter:
 476         bt_ctf_iter_destroy(iter);
 477 }
 478
 479 /*
 480  * bt_context_add_traces_recursive: Open a trace recursively
 481  * (copied from BSD code in converter/babeltrace.c)
 482  *
 483  * Find each trace present in the subdirectory starting from the given
 484  * path, and add them to the context. The packet_seek parameter can be
 485  * NULL: this specify to use the default format packet_seek.
 486  *
 487  * Return: 0 on success, nonzero on failure.
 488  * Unable to open toplevel: failure.
 489  * Unable to open some subdirectory or file: warn and continue;
 490  */
 491 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 492                 const char *format_str,
 493                 void (*packet_seek)(struct bt_stream_pos *pos,
 494                         size_t offset, int whence))
 495 {
 496         FTS *tree;
 497         FTSENT *node;
 498         GArray *trace_ids;
 499         char lpath[PATH_MAX];
 500         char * const paths[2] = { lpath, NULL };
 501         int ret = -1;
 502
 503         /*
 504          * Need to copy path, because fts_open can change it.
 505          * It is the pointer array, not the strings, that are constant.
 506          */
 507         strncpy(lpath, path, PATH_MAX);
 508         lpath[PATH_MAX - 1] = '\0';
 509
 510         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 511         if (tree == NULL) {
 512                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 513                                 path);
 514                 return -EINVAL;
 515         }
 516
 517         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 518
 519         while ((node = fts_read(tree))) {
 520                 int dirfd, metafd;
 521
 522                 if (!(node->fts_info & FTS_D))
 523                         continue;
 524
 525                 dirfd = open(node->fts_accpath, 0);
 526                 if (dirfd < 0) {
 527                         fprintf(stderr, "[error] [Context] Unable to open trace "
 528                                 "directory file descriptor.\n");
 529                         ret = dirfd;
 530                         goto error;
 531                 }
 532                 metafd = openat(dirfd, "metadata", O_RDONLY);
 533                 if (metafd < 0) {
 534                         close(dirfd);
 535                         ret = -1;
 536                         continue;
 537                 } else {
 538                         int trace_id;
 539
 540                         ret = close(metafd);
 541                         if (ret < 0) {
 542                                 perror("close");
 543                                 goto error;
 544                         }
 545                         ret = close(dirfd);
 546                         if (ret < 0) {
 547                                 perror("close");
 548                                 goto error;
 549                         }
 550
 551                         trace_id = bt_context_add_trace(ctx,
 552                                 node->fts_accpath, format_str,
 553                                 packet_seek, NULL, NULL);
 554                         if (trace_id < 0) {
 555                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 556                                         "for reading.\n", node->fts_accpath, path);
 557                                 /* Allow to skip erroneous traces. */
 558                                 continue;
 559                         }
 560                         g_array_append_val(trace_ids, trace_id);
 561                 }
 562         }
 563
 564         g_array_free(trace_ids, TRUE);
 565         return ret;
 566
 567 error:
 568         return ret;
 569 }
 570
 571 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 572                 int field_cnt, int *tid_check, int *pid_check,
 573                 int *procname_check, int *ppid_check)
 574 {
 575         int j;
 576         struct perfcounter *global;
 577         const char *name;
 578
 579         for (j = 0; j < field_cnt; j++) {
 580                 name = bt_ctf_get_decl_field_name(field_list[j]);
 581                 if (*tid_check == 0) {
 582                         if (strncmp(name, "tid", 3) == 0)
 583                                 (*tid_check)++;
 584                 }
 585                 if (*pid_check == 0) {
 586                         if (strncmp(name, "pid", 3) == 0)
 587                                 (*pid_check)++;
 588                 }
 589                 if (*ppid_check == 0) {
 590                         if (strncmp(name, "ppid", 4) == 0)
 591                                 (*ppid_check)++;
 592                 }
 593                 if (*procname_check == 0) {
 594                         if (strncmp(name, "procname", 8) == 0)
 595                                 (*procname_check)++;
 596                 }
 597                 if (strncmp(name, "perf_", 5) == 0) {
 598                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 599                         if (!global) {
 600                                 global = g_new0(struct perfcounter, 1);
 601                                 /* by default, sort on the first perf context */
 602                                 if (g_hash_table_size(global_perf_liszt) == 0)
 603                                         global->sort = 1;
 604                                 global->visible = 1;
 605                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 606                         }
 607                 }
 608         }
 609
 610         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 611                         *procname_check == 1)
 612                 return 0;
 613
 614         return -1;
 615 }
 616
 617 /*
 618  * check_requirements: check if the required context informations are available
 619  *
 620  * If each mandatory context information is available for at least in one
 621  * event, return 0 otherwise return -1.
 622  */
 623 int check_requirements(struct bt_context *ctx)
 624 {
 625         unsigned int i, evt_cnt, field_cnt;
 626         struct bt_ctf_event_decl *const * evt_list;
 627         const struct bt_ctf_field_decl *const * field_list;
 628         int tid_check = 0;
 629         int pid_check = 0;
 630         int procname_check = 0;
 631         int ppid_check = 0;
 632         int ret = 0;
 633
 634         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 635         for (i = 0; i < evt_cnt; i++) {
 636                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 637                                 &field_list, &field_cnt);
 638                 ret = check_field_requirements(field_list, field_cnt,
 639                                 &tid_check, &pid_check, &procname_check,
 640                                 &ppid_check);
 641
 642                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 643                                 &field_list, &field_cnt);
 644                 ret = check_field_requirements(field_list, field_cnt,
 645                                 &tid_check, &pid_check, &procname_check,
 646                                 &ppid_check);
 647
 648                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 649                                 &field_list, &field_cnt);
 650                 ret = check_field_requirements(field_list, field_cnt,
 651                                 &tid_check, &pid_check, &procname_check,
 652                                 &ppid_check);
 653         }
 654
 655         if (tid_check == 0) {
 656                 ret = -1;
 657                 fprintf(stderr, "[error] missing tid context information\n");
 658         }
 659         if (pid_check == 0) {
 660                 ret = -1;
 661                 fprintf(stderr, "[error] missing pid context information\n");
 662         }
 663         if (ppid_check == 0) {
 664                 ret = -1;
 665                 fprintf(stderr, "[error] missing ppid context information\n");
 666         }
 667         if (procname_check == 0) {
 668                 ret = -1;
 669                 fprintf(stderr, "[error] missing procname context information\n");
 670         }
 671
 672         return ret;
 673 }
 674
 675 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 676                 struct lttng_consumer_local_data *ctx)
 677 {
 678         unsigned long len;
 679         int err;
 680         long ret = 0;
 681         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 682
 683         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 684                 /* Get the next subbuffer */
 685                 err = helper_kernctl_get_next_subbuf(infd);
 686                 if (err != 0) {
 687                         ret = errno;
 688                         perror("Reserving sub buffer failed (everything is normal, "
 689                                         "it is due to concurrency)");
 690                         goto end;
 691                 }
 692                 /* read the whole subbuffer */
 693                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 694                 if (err != 0) {
 695                         ret = errno;
 696                         perror("Getting sub-buffer len failed.");
 697                         goto end;
 698                 }
 699
 700                 /* splice the subbuffer to the tracefile */
 701                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 702                 if (ret < 0) {
 703                         /*
 704                          * display the error but continue processing to try
 705                          * to release the subbuffer
 706                          */
 707                         fprintf(stderr,"Error splicing to tracefile\n");
 708                 }
 709                 err = helper_kernctl_put_next_subbuf(infd);
 710                 if (err != 0) {
 711                         ret = errno;
 712                         perror("Reserving sub buffer failed (everything is normal, "
 713                                         "it is due to concurrency)");
 714                         goto end;
 715                 }
 716                 sem_post(&metadata_available);
 717         }
 718
 719 end:
 720         return 0;
 721 }
 722
 723 int on_update_fd(int key, uint32_t state)
 724 {
 725         /* let the lib handle the metadata FD */
 726         if (key == sessiond_metadata)
 727                 return 0;
 728         return 1;
 729 }
 730
 731 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
 732 {
 733         int ret;
 734         struct mmap_stream *new_mmap_stream;
 735
 736         /* Opening the tracefile in write mode */
 737         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
 738                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
 739                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
 740                 if (ret < 0) {
 741                         perror("open");
 742                         goto end;
 743                 }
 744                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
 745         }
 746
 747         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
 748                 new_mmap_stream = malloc(sizeof(struct mmap_stream));
 749                 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
 750                                 kconsumerd_fd);
 751                 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
 752
 753                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
 754                 /* keep mmap FDs internally */
 755                 ret = 1;
 756         } else {
 757                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 758                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
 759                 ret = 0;
 760         }
 761
 762 end:
 763         return ret;
 764 }
 765
 766 void *live_consume()
 767 {
 768         struct bt_context *bt_ctx = NULL;
 769         int ret;
 770
 771         if (!metadata_ready) {
 772                 sem_wait(&metadata_available);
 773                 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 774                         fprintf(stderr,"no metadata\n");
 775                         return NULL;
 776                 }
 777                 metadata_ready = 1;
 778                 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 779         }
 780
 781         if (!trace_opened) {
 782                 bt_ctx = bt_context_create();
 783                 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
 784                                 lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
 785                 if (ret < 0) {
 786                         printf("Error adding trace\n");
 787                         return NULL;
 788                 }
 789                 trace_opened = 1;
 790         }
 791         iter_trace(bt_ctx);
 792
 793         return NULL;
 794 }
 795
 796 int setup_consumer(char *command_sock_path, pthread_t *threads,
 797                 struct lttng_consumer_local_data *ctx)
 798 {
 799         int ret = 0;
 800
 801         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 802                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 803         if (!ctx)
 804                 goto end;
 805
 806         unlink(command_sock_path);
 807         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 808         helper_lttng_consumer_init();
 809
 810         /* Create the thread to manage the receive of fd */
 811         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 812                         (void *) ctx);
 813         if (ret != 0) {
 814                 perror("pthread_create receive fd");
 815                 goto end;
 816         }
 817         /* Create thread to manage the polling/writing of traces */
 818         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 819                         (void *) ctx);
 820         if (ret != 0) {
 821                 perror("pthread_create poll fd");
 822                 goto end;
 823         }
 824
 825 end:
 826         return ret;
 827 }
 828
 829 void *setup_live_tracing()
 830 {
 831         struct lttng_domain dom;
 832         struct lttng_channel chan;
 833         char *channel_name = "mmapchan";
 834         struct lttng_event ev;
 835         int ret = 0;
 836         char *command_sock_path = "/tmp/consumerd_sock";
 837         static pthread_t threads[2]; /* recv_fd, poll */
 838         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 839
 840         struct lttng_handle *handle;
 841
 842         BT_INIT_LIST_HEAD(&mmap_list.head);
 843
 844         lttng_consumer_stream_array = g_ptr_array_new();
 845
 846         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 847                 fprintf(stderr,"error setting up consumer\n");
 848                 goto end;
 849         }
 850
 851         available_snapshots = g_ptr_array_new();
 852
 853         /* setup the session */
 854         dom.type = LTTNG_DOMAIN_KERNEL;
 855
 856         ret = system("rm -rf /tmp/livesession");
 857
 858         lttng_destroy_session("test");
 859         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 860                 fprintf(stderr,"error creating the session : %s\n",
 861                                 helper_lttcomm_get_readable_code(ret));
 862                 goto end;
 863         }
 864
 865         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 866                 fprintf(stderr,"error creating handle\n");
 867                 goto end;
 868         }
 869
 870         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 871                 fprintf(stderr,"error registering consumer : %s\n",
 872                                 helper_lttcomm_get_readable_code(ret));
 873                 goto end;
 874         }
 875
 876         strcpy(chan.name, channel_name);
 877         chan.attr.overwrite = 0;
 878 //      chan.attr.subbuf_size = 32768;
 879         chan.attr.subbuf_size = 1048576; /* 1MB */
 880         chan.attr.num_subbuf = 4;
 881         chan.attr.switch_timer_interval = 0;
 882         chan.attr.read_timer_interval = 200;
 883         chan.attr.output = LTTNG_EVENT_MMAP;
 884
 885         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
 886                 fprintf(stderr,"error creating channel : %s\n",
 887                                 helper_lttcomm_get_readable_code(ret));
 888                 goto end;
 889         }
 890
 891         memset(&ev, '\0', sizeof(struct lttng_event));
 892         //sprintf(ev.name, "sched_switch");
 893         ev.type = LTTNG_EVENT_TRACEPOINT;
 894         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 895                 fprintf(stderr,"error enabling event : %s\n",
 896                                 helper_lttcomm_get_readable_code(ret));
 897                 goto end;
 898         }
 899
 900         ev.type = LTTNG_EVENT_SYSCALL;
 901         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 902                 fprintf(stderr,"error enabling syscalls : %s\n",
 903                                 helper_lttcomm_get_readable_code(ret));
 904                 goto end;
 905         }
 906
 907         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
 908         lttng_add_context(handle, &kctxpid, NULL, NULL);
 909         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
 910         lttng_add_context(handle, &kctxppid, NULL, NULL);
 911         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
 912         lttng_add_context(handle, &kctxcomm, NULL, NULL);
 913         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
 914         lttng_add_context(handle, &kctxtid, NULL, NULL);
 915
 916         if ((ret = lttng_start_tracing("test")) < 0) {
 917                 fprintf(stderr,"error starting tracing : %s\n",
 918                                 helper_lttcomm_get_readable_code(ret));
 919                 goto end;
 920         }
 921
 922         helper_kernctl_buffer_flush(consumerd_metadata);
 923
 924         /* block until metadata is ready */
 925         sem_init(&metadata_available, 0, 0);
 926
 927 end:
 928         return NULL;
 929 }
 930
 931 int main(int argc, char **argv)
 932 {
 933         int ret;
 934         struct bt_context *bt_ctx = NULL;
 935
 936         ret = parse_options(argc, argv);
 937         if (ret < 0) {
 938                 fprintf(stdout, "Error parsing options.\n\n");
 939                 usage(stdout);
 940                 exit(EXIT_FAILURE);
 941         } else if (ret > 0) {
 942                 exit(EXIT_SUCCESS);
 943         }
 944
 945         if (!opt_input_path) {
 946                 setup_live_tracing();
 947                 init_lttngtop();
 948                 if (!opt_textdump) {
 949                         pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
 950                         pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
 951                 }
 952                 live_consume();
 953
 954                 sleep(2000);
 955                 lttng_stop_tracing("test");
 956                 lttng_destroy_session("test");
 957
 958                 goto end;
 959         } else {
 960                 init_lttngtop();
 961
 962                 bt_ctx = bt_context_create();
 963                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
 964                 if (ret < 0) {
 965                         fprintf(stderr, "[error] Opening the trace\n");
 966                         goto end;
 967                 }
 968
 969                 ret = check_requirements(bt_ctx);
 970                 if (ret < 0) {
 971                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
 972                         goto end;
 973                 }
 974                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
 975                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
 976
 977                 iter_trace(bt_ctx);
 978
 979                 quit = 1;
 980                 pthread_join(display_thread, NULL);
 981                 pthread_join(timer_thread, NULL);
 982         }
 983
 984 end:
 985         if (bt_ctx)
 986                 bt_context_put(bt_ctx);
 987
 988         return 0;
 989 }