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