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