src/lttngtop.c

   1 /*
   2  * Copyright (C) 2011-2012 Julien Desfossez
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License Version 2 as
   6  * published by the Free Software Foundation;
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <config.h>
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <babeltrace/babeltrace.h>
  23 #include <babeltrace/ctf/events.h>
  24 #include <babeltrace/ctf/callbacks.h>
  25 #include <babeltrace/ctf/iterator.h>
  26 #include <fcntl.h>
  27 #include <pthread.h>
  28 #include <popt.h>
  29 #include <stdlib.h>
  30 #include <ftw.h>
  31 #include <dirent.h>
  32 #include <ctype.h>
  33 #include <sys/stat.h>
  34 #include <unistd.h>
  35 #include <string.h>
  36 #include <errno.h>
  37 #include <sys/types.h>
  38 #include <fts.h>
  39 #include <assert.h>
  40 #include <sys/mman.h>
  41 #include <lttng/lttng.h>
  42 #include <lttng/lttngtop-helper.h>
  43
  44 #include "lttngtoptypes.h"
  45 #include "cputop.h"
  46 #include "iostreamtop.h"
  47 #include "cursesdisplay.h"
  48 #include "common.h"
  49
  50 #define DEFAULT_FILE_ARRAY_SIZE 1
  51
  52 const char *opt_input_path;
  53
  54 struct lttngtop *copy;
  55 pthread_t display_thread;
  56 pthread_t timer_thread;
  57
  58 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  59 unsigned long last_display_update = 0;
  60 int quit = 0;
  61
  62 /* LIVE */
  63 /* list of FDs available for being read with snapshots */
  64 struct mmap_stream_list mmap_list;
  65 GPtrArray *lttng_consumer_stream_array;
  66 int sessiond_metadata, consumerd_metadata;
  67 struct lttng_consumer_local_data *ctx = NULL;
  68 /* list of snapshots currently not consumed */
  69 GPtrArray *available_snapshots;
  70 sem_t metadata_available;
  71 FILE *metadata_fp;
  72 int trace_opened = 0;
  73 int metadata_ready = 0;
  74 void ctf_move_mmap_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence);
  75
  76 enum {
  77         OPT_NONE = 0,
  78         OPT_HELP,
  79         OPT_LIST,
  80         OPT_VERBOSE,
  81         OPT_DEBUG,
  82         OPT_NAMES,
  83 };
  84
  85 static struct poptOption long_options[] = {
  86         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  87         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  88         { NULL, 0, 0, NULL, 0, NULL, NULL },
  89 };
  90
  91 void *refresh_thread(void *p)
  92 {
  93         while (1) {
  94                 if (quit)
  95                         return NULL;
  96                 sem_wait(&pause_sem);
  97                 sem_post(&pause_sem);
  98                 sem_post(&timer);
  99                 sleep(refresh_display/NSEC_PER_SEC);
 100         }
 101 }
 102
 103 void *ncurses_display(void *p)
 104 {
 105         unsigned int current_display_index = 0;
 106
 107         sem_wait(&bootstrap);
 108         /*
 109          * Prevent the 1 second delay when we hit ESC
 110          */
 111         ESCDELAY = 0;
 112         init_ncurses();
 113
 114         while (1) {
 115                 sem_wait(&timer);
 116                 sem_wait(&goodtodisplay);
 117                 sem_wait(&pause_sem);
 118
 119                 copy = g_ptr_array_index(copies, current_display_index);
 120                 assert(copy);
 121                 display(current_display_index++);
 122
 123                 sem_post(&goodtoupdate);
 124                 sem_post(&pause_sem);
 125
 126                 if (quit) {
 127                         reset_ncurses();
 128                         pthread_exit(0);
 129                 }
 130         }
 131 }
 132
 133 /*
 134  * hook on each event to check the timestamp and refresh the display if
 135  * necessary
 136  */
 137 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 138 {
 139         unsigned long timestamp;
 140
 141         timestamp = bt_ctf_get_real_timestamp(call_data);
 142         if (timestamp == -1ULL)
 143                 goto error;
 144
 145         if (last_display_update == 0)
 146                 last_display_update = timestamp;
 147
 148         if (timestamp - last_display_update >= refresh_display) {
 149                 sem_wait(&goodtoupdate);
 150                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 151                                         timestamp));
 152                 sem_post(&goodtodisplay);
 153                 sem_post(&bootstrap);
 154                 last_display_update = timestamp;
 155         }
 156         return BT_CB_OK;
 157
 158 error:
 159         fprintf(stderr, "check_timestamp callback error\n");
 160         return BT_CB_ERROR_STOP;
 161 }
 162
 163 /*
 164  * get_perf_counter : get or create and return a perf_counter struct for
 165  * either a process or a cpu (only one of the 2 parameters mandatory)
 166  */
 167 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 168                 struct cputime *cpu)
 169 {
 170         struct perfcounter *ret;
 171         GHashTable *table;
 172
 173         if (proc)
 174                 table = proc->perf;
 175         else if (cpu)
 176                 table = cpu->perf;
 177         else
 178                 goto error;
 179
 180         ret = g_hash_table_lookup(table, (gpointer) name);
 181         if (ret)
 182                 goto end;
 183
 184         ret = g_new0(struct perfcounter, 1);
 185         /* by default, make it visible in the UI */
 186         ret->visible = 1;
 187         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 188
 189 end:
 190         return ret;
 191
 192 error:
 193         return NULL;
 194 }
 195
 196 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 197                 const char *name, int value)
 198 {
 199         struct perfcounter *cpu_perf, *process_perf;
 200
 201         cpu_perf = get_perf_counter(name, NULL, cpu);
 202         if (cpu_perf->count < value) {
 203                 process_perf = get_perf_counter(name, proc, NULL);
 204                 process_perf->count += value - cpu_perf->count;
 205                 cpu_perf->count = value;
 206         }
 207 }
 208
 209 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 210                 const struct bt_definition *scope,
 211                 struct processtop *proc,
 212                 struct cputime *cpu)
 213 {
 214         struct bt_definition const * const *list = NULL;
 215         const struct bt_definition *field;
 216         unsigned int count;
 217         struct perfcounter *perfcounter;
 218         GHashTableIter iter;
 219         gpointer key;
 220         int ret;
 221
 222         if (!scope)
 223                 goto end;
 224
 225         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 226         if (ret < 0)
 227                 goto end;
 228
 229         if (count == 0)
 230                 goto end;
 231
 232         g_hash_table_iter_init(&iter, global_perf_liszt);
 233         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 234                 field = bt_ctf_get_field(event, scope, (char *) key);
 235                 if (field) {
 236                         int value = bt_ctf_get_uint64(field);
 237                         if (bt_ctf_field_get_error())
 238                                 continue;
 239                         update_perf_value(proc, cpu, (char *) key, value);
 240                 }
 241         }
 242
 243 end:
 244         return;
 245 }
 246
 247 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 248 {
 249         struct cputime *cpu;
 250         const struct bt_definition *scope;
 251
 252         cpu = get_cpu(get_cpu_id(event));
 253
 254         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 255         extract_perf_counter_scope(event, scope, proc, cpu);
 256
 257         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 258         extract_perf_counter_scope(event, scope, proc, cpu);
 259
 260         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 261         extract_perf_counter_scope(event, scope, proc, cpu);
 262 }
 263
 264 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 265                 void *private_data)
 266 {
 267         int pid, tid, ppid;
 268         char *comm;
 269         struct processtop *parent, *child;
 270         unsigned long timestamp;
 271
 272         timestamp = bt_ctf_get_real_timestamp(call_data);
 273         if (timestamp == -1ULL)
 274                 goto error;
 275
 276         pid = get_context_pid(call_data);
 277         if (pid == -1ULL) {
 278                 goto error;
 279         }
 280         tid = get_context_tid(call_data);
 281         if (tid == -1ULL) {
 282                 goto error;
 283         }
 284         ppid = get_context_ppid(call_data);
 285         if (ppid == -1ULL) {
 286                 goto error;
 287         }
 288         comm = get_context_comm(call_data);
 289         if (!comm) {
 290                 goto error;
 291         }
 292
 293         /* find or create the current process */
 294         child = find_process_tid(&lttngtop, tid, comm);
 295         if (!child)
 296                 child = add_proc(&lttngtop, tid, comm, timestamp);
 297         update_proc(child, pid, tid, ppid, comm);
 298
 299         if (pid != tid) {
 300                 /* find or create the parent */
 301                 parent = find_process_tid(&lttngtop, pid, comm);
 302                 if (!parent) {
 303                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 304                         parent->pid = pid;
 305                 }
 306
 307                 /* attach the parent to the current process */
 308                 child->threadparent = parent;
 309                 add_thread(parent, child);
 310         }
 311
 312         update_perf_counter(child, call_data);
 313
 314         return BT_CB_OK;
 315
 316 error:
 317         return BT_CB_ERROR_STOP;
 318 }
 319
 320 void init_lttngtop()
 321 {
 322         copies = g_ptr_array_new();
 323         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 324
 325         sem_init(&goodtodisplay, 0, 0);
 326         sem_init(&goodtoupdate, 0, 1);
 327         sem_init(&timer, 0, 1);
 328         sem_init(&bootstrap, 0, 0);
 329         sem_init(&pause_sem, 0, 1);
 330         sem_init(&end_trace_sem, 0, 0);
 331
 332         reset_global_counters();
 333         lttngtop.nbproc = 0;
 334         lttngtop.nbthreads = 0;
 335         lttngtop.nbfiles = 0;
 336
 337         lttngtop.process_table = g_ptr_array_new();
 338         lttngtop.files_table = g_ptr_array_new();
 339         lttngtop.cpu_table = g_ptr_array_new();
 340 }
 341
 342 void usage(FILE *fp)
 343 {
 344         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 345         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 346 }
 347
 348 /*
 349  * Return 0 if caller should continue, < 0 if caller should return
 350  * error, > 0 if caller should exit without reporting error.
 351  */
 352 static int parse_options(int argc, char **argv)
 353 {
 354         poptContext pc;
 355         int opt, ret = 0;
 356
 357         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 358         poptReadDefaultConfig(pc, 0);
 359
 360         while ((opt = poptGetNextOpt(pc)) != -1) {
 361                 switch (opt) {
 362                         case OPT_HELP:
 363                                 usage(stdout);
 364                                 ret = 1;    /* exit cleanly */
 365                                 goto end;
 366                         default:
 367                                 ret = -EINVAL;
 368                                 goto end;
 369                 }
 370         }
 371
 372         opt_input_path = poptGetArg(pc);
 373
 374 end:
 375         if (pc) {
 376                 poptFreeContext(pc);
 377         }
 378         return ret;
 379 }
 380
 381 void iter_trace(struct bt_context *bt_ctx)
 382 {
 383         struct bt_ctf_iter *iter;
 384         struct bt_iter_pos begin_pos;
 385         const struct bt_ctf_event *event;
 386         int ret = 0;
 387
 388         begin_pos.type = BT_SEEK_BEGIN;
 389         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 390
 391         /* at each event check if we need to refresh */
 392         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 393                         check_timestamp,
 394                         NULL, NULL, NULL);
 395         /* at each event, verify the status of the process table */
 396         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 397                         fix_process_table,
 398                         NULL, NULL, NULL);
 399         /* to handle the scheduling events */
 400         bt_ctf_iter_add_callback(iter,
 401                         g_quark_from_static_string("sched_switch"),
 402                         NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 403         /* to clean up the process table */
 404         bt_ctf_iter_add_callback(iter,
 405                         g_quark_from_static_string("sched_process_free"),
 406                         NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 407         /* to get all the process from the statedumps */
 408         bt_ctf_iter_add_callback(iter,
 409                         g_quark_from_static_string(
 410                                 "lttng_statedump_process_state"),
 411                         NULL, 0, handle_statedump_process_state,
 412                         NULL, NULL, NULL);
 413
 414         /* for IO top */
 415         bt_ctf_iter_add_callback(iter,
 416                         g_quark_from_static_string("exit_syscall"),
 417                         NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 418         bt_ctf_iter_add_callback(iter,
 419                         g_quark_from_static_string("sys_write"),
 420                         NULL, 0, handle_sys_write, NULL, NULL, NULL);
 421         bt_ctf_iter_add_callback(iter,
 422                         g_quark_from_static_string("sys_read"),
 423                         NULL, 0, handle_sys_read, NULL, NULL, NULL);
 424         bt_ctf_iter_add_callback(iter,
 425                         g_quark_from_static_string("sys_open"),
 426                         NULL, 0, handle_sys_open, NULL, NULL, NULL);
 427         bt_ctf_iter_add_callback(iter,
 428                         g_quark_from_static_string("sys_close"),
 429                         NULL, 0, handle_sys_close, NULL, NULL, NULL);
 430         bt_ctf_iter_add_callback(iter,
 431                         g_quark_from_static_string(
 432                                         "lttng_statedump_file_descriptor"),
 433                         NULL, 0, handle_statedump_file_descriptor,
 434                         NULL, NULL, NULL);
 435
 436         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 437                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 438                 if (ret < 0)
 439                         goto end_iter;
 440         }
 441
 442         /* block until quit, we reached the end of the trace */
 443         sem_wait(&end_trace_sem);
 444
 445 end_iter:
 446         bt_ctf_iter_destroy(iter);
 447 }
 448
 449 /*
 450  * bt_context_add_traces_recursive: Open a trace recursively
 451  * (copied from BSD code in converter/babeltrace.c)
 452  *
 453  * Find each trace present in the subdirectory starting from the given
 454  * path, and add them to the context. The packet_seek parameter can be
 455  * NULL: this specify to use the default format packet_seek.
 456  *
 457  * Return: 0 on success, nonzero on failure.
 458  * Unable to open toplevel: failure.
 459  * Unable to open some subdirectory or file: warn and continue;
 460  */
 461 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 462                 const char *format_str,
 463                 void (*packet_seek)(struct bt_stream_pos *pos,
 464                         size_t offset, int whence))
 465 {
 466         FTS *tree;
 467         FTSENT *node;
 468         GArray *trace_ids;
 469         char lpath[PATH_MAX];
 470         char * const paths[2] = { lpath, NULL };
 471         int ret = -1;
 472
 473         /*
 474          * Need to copy path, because fts_open can change it.
 475          * It is the pointer array, not the strings, that are constant.
 476          */
 477         strncpy(lpath, path, PATH_MAX);
 478         lpath[PATH_MAX - 1] = '\0';
 479
 480         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 481         if (tree == NULL) {
 482                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 483                                 path);
 484                 return -EINVAL;
 485         }
 486
 487         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 488
 489         while ((node = fts_read(tree))) {
 490                 int dirfd, metafd;
 491
 492                 if (!(node->fts_info & FTS_D))
 493                         continue;
 494
 495                 dirfd = open(node->fts_accpath, 0);
 496                 if (dirfd < 0) {
 497                         fprintf(stderr, "[error] [Context] Unable to open trace "
 498                                 "directory file descriptor.\n");
 499                         ret = dirfd;
 500                         goto error;
 501                 }
 502                 metafd = openat(dirfd, "metadata", O_RDONLY);
 503                 if (metafd < 0) {
 504                         close(dirfd);
 505                         ret = -1;
 506                         continue;
 507                 } else {
 508                         int trace_id;
 509
 510                         ret = close(metafd);
 511                         if (ret < 0) {
 512                                 perror("close");
 513                                 goto error;
 514                         }
 515                         ret = close(dirfd);
 516                         if (ret < 0) {
 517                                 perror("close");
 518                                 goto error;
 519                         }
 520
 521                         trace_id = bt_context_add_trace(ctx,
 522                                 node->fts_accpath, format_str,
 523                                 packet_seek, NULL, NULL);
 524                         if (trace_id < 0) {
 525                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 526                                         "for reading.\n", node->fts_accpath, path);
 527                                 /* Allow to skip erroneous traces. */
 528                                 continue;
 529                         }
 530                         g_array_append_val(trace_ids, trace_id);
 531                 }
 532         }
 533
 534         g_array_free(trace_ids, TRUE);
 535         return ret;
 536
 537 error:
 538         return ret;
 539 }
 540
 541 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 542                 int field_cnt, int *tid_check, int *pid_check,
 543                 int *procname_check, int *ppid_check)
 544 {
 545         int j;
 546         struct perfcounter *global;
 547         const char *name;
 548
 549         for (j = 0; j < field_cnt; j++) {
 550                 name = bt_ctf_get_decl_field_name(field_list[j]);
 551                 if (*tid_check == 0) {
 552                         if (strncmp(name, "tid", 3) == 0)
 553                                 (*tid_check)++;
 554                 }
 555                 if (*pid_check == 0) {
 556                         if (strncmp(name, "pid", 3) == 0)
 557                                 (*pid_check)++;
 558                 }
 559                 if (*ppid_check == 0) {
 560                         if (strncmp(name, "ppid", 4) == 0)
 561                                 (*ppid_check)++;
 562                 }
 563                 if (*procname_check == 0) {
 564                         if (strncmp(name, "procname", 8) == 0)
 565                                 (*procname_check)++;
 566                 }
 567                 if (strncmp(name, "perf_", 5) == 0) {
 568                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 569                         if (!global) {
 570                                 global = g_new0(struct perfcounter, 1);
 571                                 /* by default, sort on the first perf context */
 572                                 if (g_hash_table_size(global_perf_liszt) == 0)
 573                                         global->sort = 1;
 574                                 global->visible = 1;
 575                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 576                         }
 577                 }
 578         }
 579
 580         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 581                         *procname_check == 1)
 582                 return 0;
 583
 584         return -1;
 585 }
 586
 587 /*
 588  * check_requirements: check if the required context informations are available
 589  *
 590  * If each mandatory context information is available for at least in one
 591  * event, return 0 otherwise return -1.
 592  */
 593 int check_requirements(struct bt_context *ctx)
 594 {
 595         unsigned int i, evt_cnt, field_cnt;
 596         struct bt_ctf_event_decl *const * evt_list;
 597         const struct bt_ctf_field_decl *const * field_list;
 598         int tid_check = 0;
 599         int pid_check = 0;
 600         int procname_check = 0;
 601         int ppid_check = 0;
 602         int ret = 0;
 603
 604         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 605         for (i = 0; i < evt_cnt; i++) {
 606                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 607                                 &field_list, &field_cnt);
 608                 ret = check_field_requirements(field_list, field_cnt,
 609                                 &tid_check, &pid_check, &procname_check,
 610                                 &ppid_check);
 611
 612                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 613                                 &field_list, &field_cnt);
 614                 ret = check_field_requirements(field_list, field_cnt,
 615                                 &tid_check, &pid_check, &procname_check,
 616                                 &ppid_check);
 617
 618                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 619                                 &field_list, &field_cnt);
 620                 ret = check_field_requirements(field_list, field_cnt,
 621                                 &tid_check, &pid_check, &procname_check,
 622                                 &ppid_check);
 623         }
 624
 625         if (tid_check == 0) {
 626                 ret = -1;
 627                 fprintf(stderr, "[error] missing tid context information\n");
 628         }
 629         if (pid_check == 0) {
 630                 ret = -1;
 631                 fprintf(stderr, "[error] missing pid context information\n");
 632         }
 633         if (ppid_check == 0) {
 634                 ret = -1;
 635                 fprintf(stderr, "[error] missing ppid context information\n");
 636         }
 637         if (procname_check == 0) {
 638                 ret = -1;
 639                 fprintf(stderr, "[error] missing procname context information\n");
 640         }
 641
 642         return ret;
 643 }
 644
 645 void dump_snapshot()
 646 {
 647         struct lttng_consumer_stream *iter;
 648         unsigned long spos;
 649         struct mmap_stream *new_snapshot;
 650
 651         int ret = 0;
 652         int i;
 653         /*
 654          * try lock mutex ressource courante (overrun)
 655          * if fail : overrun
 656          * stop trace (flush implicite avant stop)
 657          * lttng_consumer_take_snapshot
 658          * read timestamp packet end (use time as end pos)
 659          *      - stream_packet_context
 660          *      - reculer de 1 subbuf : pos - max_subbuff_size
 661          *
 662          *      - position de fin (take_snapshot)
 663          *      - mov_pos_slow ( fin - max_subbuff_size) lire timestamp packet end
 664          *      - prend min(end) (activité sur tous les streams)
 665          *
 666          * start trace
 667          * unlock mutex
 668          */
 669
 670         helper_kernctl_buffer_flush(consumerd_metadata);
 671         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 672                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 673                 helper_kernctl_buffer_flush(helper_get_lttng_consumer_stream_wait_fd(iter));
 674                 printf("Taking snapshot of fd : %d\n", helper_get_lttng_consumer_stream_wait_fd(iter));
 675                 ret = helper_lttng_consumer_take_snapshot(ctx, iter);
 676                 if (ret != 0) {
 677                         ret = errno;
 678                         perror("lttng_consumer_take_snapshots");
 679                         goto end;
 680                 }
 681         }
 682         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 683                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 684                 ret = helper_lttng_consumer_get_produced_snapshot(ctx, iter, &spos);
 685                 if (ret != 0) {
 686                         ret = errno;
 687                         perror("helper_lttng_consumer_get_produced_snapshot");
 688                         goto end;
 689                 }
 690                 while (helper_get_lttng_consumer_stream_wait_last_pos(iter) < spos) {
 691                         new_snapshot = g_new0(struct mmap_stream, 1);
 692                         new_snapshot->fd = helper_get_lttng_consumer_stream_wait_fd(iter);
 693                         new_snapshot->last_pos = helper_get_lttng_consumer_stream_wait_last_pos(iter);
 694                         fprintf(stderr,"ADDING AVAILABLE SNAPSHOT ON FD %d AT POSITION %lu\n",
 695                                         new_snapshot->fd,
 696                                         new_snapshot->last_pos);
 697                         g_ptr_array_add(available_snapshots, new_snapshot);
 698                         helper_set_lttng_consumer_stream_wait_last_pos(iter,
 699                                 helper_get_lttng_consumer_stream_wait_last_pos(iter) +
 700                                 helper_get_lttng_consumer_stream_chan_max_sb_size(iter));
 701                 }
 702         }
 703
 704         if (!metadata_ready) {
 705                 fprintf(stderr, "BLOCKING BEFORE METADATA\n");
 706                 sem_wait(&metadata_available);
 707                 fprintf(stderr,"OPENING TRACE\n");
 708                 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 709                         fprintf(stderr,"NO METADATA FILE, SKIPPING\n");
 710                         return;
 711                 }
 712                 metadata_ready = 1;
 713                 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 714         }
 715
 716
 717 end:
 718         return;
 719 }
 720
 721 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 722                 struct lttng_consumer_local_data *ctx)
 723 {
 724         unsigned long len;
 725         int err;
 726         long ret = 0;
 727         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 728
 729         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 730                 /* Get the next subbuffer */
 731                 printf("get_next : %d\n", infd);
 732                 err = helper_kernctl_get_next_subbuf(infd);
 733                 if (err != 0) {
 734                         ret = errno;
 735                         perror("Reserving sub buffer failed (everything is normal, "
 736                                         "it is due to concurrency)");
 737                         goto end;
 738                 }
 739                 /* read the whole subbuffer */
 740                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 741                 if (err != 0) {
 742                         ret = errno;
 743                         perror("Getting sub-buffer len failed.");
 744                         goto end;
 745                 }
 746                 printf("len : %ld\n", len);
 747
 748                 /* splice the subbuffer to the tracefile */
 749                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 750                 if (ret < 0) {
 751                         /*
 752                          * display the error but continue processing to try
 753                          * to release the subbuffer
 754                          */
 755                         fprintf(stderr,"Error splicing to tracefile\n");
 756                 }
 757                 printf("ret : %ld\n", ret);
 758                 printf("put_next : %d\n", infd);
 759                 err = helper_kernctl_put_next_subbuf(infd);
 760                 if (err != 0) {
 761                         ret = errno;
 762                         perror("Reserving sub buffer failed (everything is normal, "
 763                                         "it is due to concurrency)");
 764                         goto end;
 765                 }
 766                 sem_post(&metadata_available);
 767         }
 768
 769 end:
 770         return 0;
 771 }
 772
 773 int on_update_fd(int key, uint32_t state)
 774 {
 775         /* let the lib handle the metadata FD */
 776         if (key == sessiond_metadata)
 777                 return 0;
 778         return 1;
 779 }
 780
 781 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
 782 {
 783         int ret;
 784         struct mmap_stream *new_info;
 785         size_t tmp_mmap_len;
 786
 787         /* Opening the tracefile in write mode */
 788         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
 789                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
 790                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
 791                 if (ret < 0) {
 792                         perror("open");
 793                         goto end;
 794                 }
 795                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
 796         }
 797
 798         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
 799                 new_info = malloc(sizeof(struct mmap_stream));
 800                 new_info->fd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 801                 bt_list_add(&new_info->list, &mmap_list.head);
 802
 803                 /* get the len of the mmap region */
 804                 ret = helper_kernctl_get_mmap_len(helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd),
 805                                 &tmp_mmap_len);
 806                 if (ret != 0) {
 807                         ret = errno;
 808                         perror("helper_kernctl_get_mmap_len");
 809                         goto end;
 810                 }
 811                 helper_set_lttng_consumer_stream_mmap_len(kconsumerd_fd, tmp_mmap_len);
 812
 813                 helper_set_lttng_consumer_stream_mmap_base(kconsumerd_fd,
 814                                 mmap(NULL, helper_get_lttng_consumer_stream_mmap_len(kconsumerd_fd),
 815                                 PROT_READ, MAP_PRIVATE, helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd), 0));
 816                 if (helper_get_lttng_consumer_stream_mmap_base(kconsumerd_fd) == MAP_FAILED) {
 817                         perror("Error mmaping");
 818                         ret = -1;
 819                         goto end;
 820                 }
 821
 822                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
 823                 ret = 1;
 824         } else {
 825                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 826                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
 827                 ret = 0;
 828         }
 829
 830 end:
 831         return ret;
 832 }
 833
 834 void *live_consume()
 835 {
 836         struct bt_context *bt_ctx = NULL;
 837         int ret;
 838
 839         while (1) {
 840                 dump_snapshot();
 841                 /*
 842                 if (!trace_opened) {
 843                         bt_ctx = bt_context_create();
 844                         ret = bt_context_add_trace(ctx, NULL, "ctf",
 845                                         ctf_move_mmap_pos_slow, mmap_list, metadata_fp);
 846                         trace_opened = 1;
 847                 }
 848                 */
 849                 //iter_trace(bt_ctx);
 850                 sleep(1);
 851         }
 852 }
 853
 854 int setup_consumer(char *command_sock_path, pthread_t *threads,
 855                 struct lttng_consumer_local_data *ctx)
 856 {
 857         int ret = 0;
 858
 859         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 860                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 861         if (!ctx)
 862                 goto end;
 863
 864         unlink(command_sock_path);
 865         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 866         helper_lttng_consumer_init();
 867
 868         /* Create the thread to manage the receive of fd */
 869         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 870                         (void *) ctx);
 871         if (ret != 0) {
 872                 perror("pthread_create");
 873                 goto end;
 874         }
 875         /* Create thread to manage the polling/writing of traces */
 876         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 877                         (void *) ctx);
 878         if (ret != 0) {
 879                 perror("pthread_create");
 880                 goto end;
 881         }
 882
 883         /* Create thread to manage the polling/writing of traces */
 884         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 885                         (void *) ctx);
 886         if (ret != 0) {
 887                 perror("pthread_create");
 888                 goto end;
 889         }
 890
 891 end:
 892         return ret;
 893 }
 894
 895 int setup_live_tracing()
 896 {
 897         struct lttng_domain dom;
 898         struct lttng_channel chan;
 899         char *channel_name = "mmapchan";
 900         struct lttng_event ev;
 901         int ret = 0;
 902         char *command_sock_path = "/tmp/consumerd_sock";
 903         static pthread_t threads[2]; /* recv_fd, poll */
 904         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 905
 906         struct lttng_handle *handle;
 907         pthread_t live_trace_thread;
 908
 909         BT_INIT_LIST_HEAD(&mmap_list.head);
 910
 911         lttng_consumer_stream_array = g_ptr_array_new();
 912
 913         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 914                 fprintf(stderr,"error setting up consumer\n");
 915                 goto end;
 916         }
 917
 918         available_snapshots = g_ptr_array_new();
 919
 920         /* setup the session */
 921         dom.type = LTTNG_DOMAIN_KERNEL;
 922
 923         ret = system("rm -rf /tmp/livesession");
 924
 925         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 926                 fprintf(stderr,"error creating the session : %s\n",
 927                                 helper_lttcomm_get_readable_code(ret));
 928                 goto end;
 929         }
 930
 931         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 932                 fprintf(stderr,"error creating handle\n");
 933                 goto end;
 934         }
 935
 936         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 937                 fprintf(stderr,"error registering consumer : %s\n",
 938                                 helper_lttcomm_get_readable_code(ret));
 939                 goto end;
 940         }
 941
 942         strcpy(chan.name, channel_name);
 943         chan.attr.overwrite = 1;
 944 //      chan.attr.subbuf_size = 32768;
 945         chan.attr.subbuf_size = 1048576; /* 1MB */
 946         chan.attr.num_subbuf = 4;
 947         chan.attr.switch_timer_interval = 0;
 948         chan.attr.read_timer_interval = 200;
 949         chan.attr.output = LTTNG_EVENT_MMAP;
 950
 951         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
 952                 fprintf(stderr,"error creating channel : %s\n", helper_lttcomm_get_readable_code(ret));
 953                 goto end;
 954         }
 955
 956         sprintf(ev.name, "sched_switch");
 957         ev.type = LTTNG_EVENT_TRACEPOINT;
 958
 959         //if ((ret = lttng_enable_event(handle, NULL, channel_name)) < 0) {
 960         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 961                 fprintf(stderr,"error enabling event : %s\n", helper_lttcomm_get_readable_code(ret));
 962                 goto end;
 963         }
 964
 965         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
 966         lttng_add_context(handle, &kctxpid, NULL, NULL);
 967         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
 968         lttng_add_context(handle, &kctxppid, NULL, NULL);
 969         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
 970         lttng_add_context(handle, &kctxcomm, NULL, NULL);
 971         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
 972         lttng_add_context(handle, &kctxtid, NULL, NULL);
 973
 974         if ((ret = lttng_start_tracing("test")) < 0) {
 975                 fprintf(stderr,"error starting tracing : %s\n", helper_lttcomm_get_readable_code(ret));
 976                 goto end;
 977         }
 978
 979         helper_kernctl_buffer_flush(consumerd_metadata);
 980
 981         /* Create thread to manage the polling/writing of traces */
 982         ret = pthread_create(&live_trace_thread, NULL, live_consume, NULL);
 983         if (ret != 0) {
 984                 perror("pthread_create");
 985                 goto end;
 986         }
 987
 988         sleep(10);
 989         pthread_cancel(live_trace_thread);
 990
 991         lttng_stop_tracing("test");
 992         lttng_destroy_session("test");
 993
 994         /* block until metadata is ready */
 995         sem_init(&metadata_available, 0, 0);
 996
 997         //init_lttngtop();
 998
 999 end:
1000         return ret;
1001 }
1002
1003 int main(int argc, char **argv)
1004 {
1005         int ret;
1006         struct bt_context *bt_ctx = NULL;
1007
1008         ret = parse_options(argc, argv);
1009         if (ret < 0) {
1010                 fprintf(stdout, "Error parsing options.\n\n");
1011                 usage(stdout);
1012                 exit(EXIT_FAILURE);
1013         } else if (ret > 0) {
1014                 exit(EXIT_SUCCESS);
1015         }
1016
1017         if (!opt_input_path) {
1018                 printf("live tracing enabled\n");
1019                 setup_live_tracing();
1020                 goto end;
1021         } else {
1022                 init_lttngtop();
1023
1024                 bt_ctx = bt_context_create();
1025                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1026                 if (ret < 0) {
1027                         fprintf(stderr, "[error] Opening the trace\n");
1028                         goto end;
1029                 }
1030
1031                 ret = check_requirements(bt_ctx);
1032                 if (ret < 0) {
1033                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1034                         goto end;
1035                 }
1036                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1037                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1038
1039                 iter_trace(bt_ctx);
1040
1041                 quit = 1;
1042                 pthread_join(display_thread, NULL);
1043                 pthread_join(timer_thread, NULL);
1044         }
1045
1046 end:
1047         if (bt_ctx)
1048                 bt_context_put(bt_ctx);
1049
1050         return 0;
1051 }