src/lttngtop.c

   1 /*
   2  * Copyright (C) 2011-2012 Julien Desfossez
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License Version 2 as
   6  * published by the Free Software Foundation;
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <config.h>
  20 #include <stdio.h>
  21 #include <stdint.h>
  22 #include <babeltrace/babeltrace.h>
  23 #include <babeltrace/ctf/events.h>
  24 #include <babeltrace/ctf/callbacks.h>
  25 #include <babeltrace/ctf/iterator.h>
  26 #include <fcntl.h>
  27 #include <pthread.h>
  28 #include <popt.h>
  29 #include <stdlib.h>
  30 #include <ftw.h>
  31 #include <dirent.h>
  32 #include <ctype.h>
  33 #include <sys/stat.h>
  34 #include <unistd.h>
  35 #include <string.h>
  36 #include <errno.h>
  37 #include <sys/types.h>
  38 #include <fts.h>
  39 #include <assert.h>
  40 #include <sys/mman.h>
  41 #include <lttng/lttng.h>
  42 #include <lttng/lttngtop-helper.h>
  43 #include <babeltrace/lttngtopmmappacketseek.h>
  44
  45 #include "lttngtoptypes.h"
  46 #include "cputop.h"
  47 #include "iostreamtop.h"
  48 #include "cursesdisplay.h"
  49 #include "common.h"
  50
  51 #define DEFAULT_FILE_ARRAY_SIZE 1
  52
  53 const char *opt_input_path;
  54 int opt_textdump;
  55
  56 int quit = 0;
  57
  58 struct lttngtop *copy;
  59 pthread_t display_thread;
  60 pthread_t timer_thread;
  61
  62 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  63 unsigned long last_display_update = 0;
  64
  65 /* list of FDs available for being read with snapshots */
  66 struct mmap_stream_list mmap_list;
  67 GPtrArray *lttng_consumer_stream_array;
  68 int sessiond_metadata, consumerd_metadata;
  69 struct lttng_consumer_local_data *ctx = NULL;
  70 /* list of snapshots currently not consumed */
  71 GPtrArray *available_snapshots;
  72 sem_t metadata_available;
  73 int reload_trace = 0;
  74
  75 enum {
  76         OPT_NONE = 0,
  77         OPT_HELP,
  78         OPT_TEXTDUMP,
  79 };
  80
  81 static struct poptOption long_options[] = {
  82         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  83         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  84         { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
  85         { NULL, 0, 0, NULL, 0, NULL, NULL },
  86 };
  87
  88 void *refresh_thread(void *p)
  89 {
  90         struct mmap_stream *mmap_info;
  91
  92         while (1) {
  93                 if (quit) {
  94                         sem_post(&pause_sem);
  95                         sem_post(&timer);
  96                         sem_post(&end_trace_sem);
  97                         sem_post(&goodtodisplay);
  98                         sem_post(&goodtoupdate);
  99                         pthread_exit(0);
 100                 }
 101                 if (!opt_input_path) {
 102                 bt_list_for_each_entry(mmap_info, &mmap_list.head, list)
 103                         helper_kernctl_buffer_flush(mmap_info->fd);
 104                 }
 105                 sem_wait(&pause_sem);
 106                 sem_post(&pause_sem);
 107                 sem_post(&timer);
 108                 sleep(refresh_display/NSEC_PER_SEC);
 109         }
 110 }
 111
 112 void *ncurses_display(void *p)
 113 {
 114         unsigned int current_display_index = 0;
 115
 116         sem_wait(&bootstrap);
 117         /*
 118          * Prevent the 1 second delay when we hit ESC
 119          */
 120         ESCDELAY = 0;
 121         init_ncurses();
 122
 123         while (1) {
 124                 sem_wait(&timer);
 125                 sem_wait(&goodtodisplay);
 126                 sem_wait(&pause_sem);
 127
 128                 if (quit) {
 129                         sem_post(&pause_sem);
 130                         sem_post(&timer);
 131                         reset_ncurses();
 132                         pthread_exit(0);
 133                 }
 134
 135                 copy = g_ptr_array_index(copies, current_display_index);
 136                 assert(copy);
 137                 display(current_display_index++);
 138
 139                 sem_post(&goodtoupdate);
 140                 sem_post(&pause_sem);
 141         }
 142 }
 143
 144 /*
 145  * hook on each event to check the timestamp and refresh the display if
 146  * necessary
 147  */
 148 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
 149 {
 150         unsigned long timestamp;
 151         struct tm start;
 152         uint64_t ts_nsec_start;
 153
 154         timestamp = bt_ctf_get_timestamp(call_data);
 155
 156         start = format_timestamp(timestamp);
 157         ts_nsec_start = timestamp % NSEC_PER_SEC;
 158
 159         printf("%02d:%02d:%02d.%09" PRIu64 " %s\n", start.tm_hour,
 160                         start.tm_min, start.tm_sec, ts_nsec_start,
 161                         bt_ctf_event_name(call_data));
 162
 163         return BT_CB_OK;
 164 }
 165
 166 /*
 167  * hook on each event to check the timestamp and refresh the display if
 168  * necessary
 169  */
 170 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 171 {
 172         unsigned long timestamp;
 173
 174         timestamp = bt_ctf_get_timestamp(call_data);
 175         if (timestamp == -1ULL)
 176                 goto error;
 177
 178         if (last_display_update == 0)
 179                 last_display_update = timestamp;
 180
 181         if (timestamp - last_display_update >= refresh_display) {
 182                 sem_wait(&goodtoupdate);
 183                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 184                                         timestamp));
 185                 sem_post(&goodtodisplay);
 186                 sem_post(&bootstrap);
 187                 last_display_update = timestamp;
 188         }
 189         return BT_CB_OK;
 190
 191 error:
 192         fprintf(stderr, "check_timestamp callback error\n");
 193         return BT_CB_ERROR_STOP;
 194 }
 195
 196 /*
 197  * get_perf_counter : get or create and return a perf_counter struct for
 198  * either a process or a cpu (only one of the 2 parameters mandatory)
 199  */
 200 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 201                 struct cputime *cpu)
 202 {
 203         struct perfcounter *ret;
 204         GHashTable *table;
 205
 206         if (proc)
 207                 table = proc->perf;
 208         else if (cpu)
 209                 table = cpu->perf;
 210         else
 211                 goto error;
 212
 213         ret = g_hash_table_lookup(table, (gpointer) name);
 214         if (ret)
 215                 goto end;
 216
 217         ret = g_new0(struct perfcounter, 1);
 218         /* by default, make it visible in the UI */
 219         ret->visible = 1;
 220         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 221
 222 end:
 223         return ret;
 224
 225 error:
 226         return NULL;
 227 }
 228
 229 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 230                 const char *name, int value)
 231 {
 232         struct perfcounter *cpu_perf, *process_perf;
 233
 234         cpu_perf = get_perf_counter(name, NULL, cpu);
 235         if (cpu_perf->count < value) {
 236                 process_perf = get_perf_counter(name, proc, NULL);
 237                 process_perf->count += value - cpu_perf->count;
 238                 cpu_perf->count = value;
 239         }
 240 }
 241
 242 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 243                 const struct bt_definition *scope,
 244                 struct processtop *proc,
 245                 struct cputime *cpu)
 246 {
 247         struct bt_definition const * const *list = NULL;
 248         const struct bt_definition *field;
 249         unsigned int count;
 250         struct perfcounter *perfcounter;
 251         GHashTableIter iter;
 252         gpointer key;
 253         int ret;
 254
 255         if (!scope)
 256                 goto end;
 257
 258         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 259         if (ret < 0)
 260                 goto end;
 261
 262         if (count == 0)
 263                 goto end;
 264
 265         g_hash_table_iter_init(&iter, global_perf_liszt);
 266         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 267                 field = bt_ctf_get_field(event, scope, (char *) key);
 268                 if (field) {
 269                         int value = bt_ctf_get_uint64(field);
 270                         if (bt_ctf_field_get_error())
 271                                 continue;
 272                         update_perf_value(proc, cpu, (char *) key, value);
 273                 }
 274         }
 275
 276 end:
 277         return;
 278 }
 279
 280 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 281 {
 282         struct cputime *cpu;
 283         const struct bt_definition *scope;
 284
 285         cpu = get_cpu(get_cpu_id(event));
 286
 287         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 288         extract_perf_counter_scope(event, scope, proc, cpu);
 289
 290         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 291         extract_perf_counter_scope(event, scope, proc, cpu);
 292
 293         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 294         extract_perf_counter_scope(event, scope, proc, cpu);
 295 }
 296
 297 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 298                 void *private_data)
 299 {
 300         int pid, tid, ppid, vpid, vtid, vppid;
 301         char *comm;
 302         struct processtop *parent, *child;
 303         unsigned long timestamp;
 304
 305         timestamp = bt_ctf_get_timestamp(call_data);
 306         if (timestamp == -1ULL)
 307                 goto error;
 308
 309         pid = get_context_pid(call_data);
 310         if (pid == -1ULL) {
 311                 goto error;
 312         }
 313         tid = get_context_tid(call_data);
 314         if (tid == -1ULL) {
 315                 goto error;
 316         }
 317         ppid = get_context_ppid(call_data);
 318         if (ppid == -1ULL) {
 319                 goto error;
 320         }
 321         vpid = get_context_vpid(call_data);
 322         if (pid == -1ULL) {
 323                 vpid = -1;
 324         }
 325         vtid = get_context_vtid(call_data);
 326         if (tid == -1ULL) {
 327                 vtid = -1;
 328         }
 329         vppid = get_context_vppid(call_data);
 330         if (ppid == -1ULL) {
 331                 vppid = -1;
 332         }
 333         comm = get_context_comm(call_data);
 334         if (!comm) {
 335                 goto error;
 336         }
 337
 338         /* find or create the current process */
 339         child = find_process_tid(&lttngtop, tid, comm);
 340         if (!child)
 341                 child = add_proc(&lttngtop, tid, comm, timestamp);
 342         update_proc(child, pid, tid, ppid, vpid, vtid, vppid, comm);
 343
 344         if (pid != tid) {
 345                 /* find or create the parent */
 346                 parent = find_process_tid(&lttngtop, pid, comm);
 347                 if (!parent) {
 348                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 349                         parent->pid = pid;
 350                 }
 351
 352                 /* attach the parent to the current process */
 353                 child->threadparent = parent;
 354                 add_thread(parent, child);
 355         }
 356
 357         update_perf_counter(child, call_data);
 358
 359         return BT_CB_OK;
 360
 361 error:
 362         return BT_CB_ERROR_STOP;
 363 }
 364
 365 void init_lttngtop()
 366 {
 367         copies = g_ptr_array_new();
 368         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 369
 370         sem_init(&goodtodisplay, 0, 0);
 371         sem_init(&goodtoupdate, 0, 1);
 372         sem_init(&timer, 0, 1);
 373         sem_init(&bootstrap, 0, 0);
 374         sem_init(&pause_sem, 0, 1);
 375         sem_init(&end_trace_sem, 0, 0);
 376
 377         reset_global_counters();
 378         lttngtop.nbproc = 0;
 379         lttngtop.nbthreads = 0;
 380         lttngtop.nbfiles = 0;
 381
 382         lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
 383                         g_direct_equal);
 384         lttngtop.process_table = g_ptr_array_new();
 385         lttngtop.files_table = g_ptr_array_new();
 386         lttngtop.cpu_table = g_ptr_array_new();
 387 }
 388
 389 void usage(FILE *fp)
 390 {
 391         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 392         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 393 }
 394
 395 /*
 396  * Return 0 if caller should continue, < 0 if caller should return
 397  * error, > 0 if caller should exit without reporting error.
 398  */
 399 static int parse_options(int argc, char **argv)
 400 {
 401         poptContext pc;
 402         int opt, ret = 0;
 403
 404         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 405         poptReadDefaultConfig(pc, 0);
 406
 407         while ((opt = poptGetNextOpt(pc)) != -1) {
 408                 switch (opt) {
 409                         case OPT_HELP:
 410                                 usage(stdout);
 411                                 ret = 1;    /* exit cleanly */
 412                                 goto end;
 413                         case OPT_TEXTDUMP:
 414                                 opt_textdump = 1;
 415                                 goto end;
 416                         default:
 417                                 ret = -EINVAL;
 418                                 goto end;
 419                 }
 420         }
 421
 422         opt_input_path = poptGetArg(pc);
 423
 424 end:
 425         if (pc) {
 426                 poptFreeContext(pc);
 427         }
 428         return ret;
 429 }
 430
 431 void iter_trace(struct bt_context *bt_ctx)
 432 {
 433         struct bt_ctf_iter *iter;
 434         struct bt_iter_pos begin_pos;
 435         const struct bt_ctf_event *event;
 436         int ret = 0;
 437
 438         begin_pos.type = BT_SEEK_BEGIN;
 439         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 440
 441         if (opt_textdump) {
 442                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 443                                 print_timestamp,
 444                                 NULL, NULL, NULL);
 445         } else {
 446                 /* at each event check if we need to refresh */
 447                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 448                                 check_timestamp,
 449                                 NULL, NULL, NULL);
 450                 /* at each event, verify the status of the process table */
 451                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 452                                 fix_process_table,
 453                                 NULL, NULL, NULL);
 454                 /* to handle the scheduling events */
 455                 bt_ctf_iter_add_callback(iter,
 456                                 g_quark_from_static_string("sched_switch"),
 457                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 458                 /* to clean up the process table */
 459                 bt_ctf_iter_add_callback(iter,
 460                                 g_quark_from_static_string("sched_process_free"),
 461                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 462                 /* to get all the process from the statedumps */
 463                 bt_ctf_iter_add_callback(iter,
 464                                 g_quark_from_static_string(
 465                                         "lttng_statedump_process_state"),
 466                                 NULL, 0, handle_statedump_process_state,
 467                                 NULL, NULL, NULL);
 468
 469                 /* for IO top */
 470                 bt_ctf_iter_add_callback(iter,
 471                                 g_quark_from_static_string("exit_syscall"),
 472                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 473                 bt_ctf_iter_add_callback(iter,
 474                                 g_quark_from_static_string("sys_write"),
 475                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 476                 bt_ctf_iter_add_callback(iter,
 477                                 g_quark_from_static_string("sys_read"),
 478                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 479                 bt_ctf_iter_add_callback(iter,
 480                                 g_quark_from_static_string("sys_open"),
 481                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 482                 bt_ctf_iter_add_callback(iter,
 483                                 g_quark_from_static_string("sys_close"),
 484                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 485                 bt_ctf_iter_add_callback(iter,
 486                                 g_quark_from_static_string(
 487                                         "lttng_statedump_file_descriptor"),
 488                                 NULL, 0, handle_statedump_file_descriptor,
 489                                 NULL, NULL, NULL);
 490         }
 491
 492         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 493                 if (quit || reload_trace)
 494                         goto end_iter;
 495                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 496                 if (ret < 0)
 497                         goto end_iter;
 498         }
 499
 500         /* block until quit, we reached the end of the trace */
 501         sem_wait(&end_trace_sem);
 502
 503 end_iter:
 504         bt_ctf_iter_destroy(iter);
 505 }
 506
 507 /*
 508  * bt_context_add_traces_recursive: Open a trace recursively
 509  * (copied from BSD code in converter/babeltrace.c)
 510  *
 511  * Find each trace present in the subdirectory starting from the given
 512  * path, and add them to the context. The packet_seek parameter can be
 513  * NULL: this specify to use the default format packet_seek.
 514  *
 515  * Return: 0 on success, nonzero on failure.
 516  * Unable to open toplevel: failure.
 517  * Unable to open some subdirectory or file: warn and continue;
 518  */
 519 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 520                 const char *format_str,
 521                 void (*packet_seek)(struct bt_stream_pos *pos,
 522                         size_t offset, int whence))
 523 {
 524         FTS *tree;
 525         FTSENT *node;
 526         GArray *trace_ids;
 527         char lpath[PATH_MAX];
 528         char * const paths[2] = { lpath, NULL };
 529         int ret = -1;
 530
 531         /*
 532          * Need to copy path, because fts_open can change it.
 533          * It is the pointer array, not the strings, that are constant.
 534          */
 535         strncpy(lpath, path, PATH_MAX);
 536         lpath[PATH_MAX - 1] = '\0';
 537
 538         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 539         if (tree == NULL) {
 540                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 541                                 path);
 542                 return -EINVAL;
 543         }
 544
 545         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 546
 547         while ((node = fts_read(tree))) {
 548                 int dirfd, metafd;
 549
 550                 if (!(node->fts_info & FTS_D))
 551                         continue;
 552
 553                 dirfd = open(node->fts_accpath, 0);
 554                 if (dirfd < 0) {
 555                         fprintf(stderr, "[error] [Context] Unable to open trace "
 556                                 "directory file descriptor.\n");
 557                         ret = dirfd;
 558                         goto error;
 559                 }
 560                 metafd = openat(dirfd, "metadata", O_RDONLY);
 561                 if (metafd < 0) {
 562                         close(dirfd);
 563                         ret = -1;
 564                         continue;
 565                 } else {
 566                         int trace_id;
 567
 568                         ret = close(metafd);
 569                         if (ret < 0) {
 570                                 perror("close");
 571                                 goto error;
 572                         }
 573                         ret = close(dirfd);
 574                         if (ret < 0) {
 575                                 perror("close");
 576                                 goto error;
 577                         }
 578
 579                         trace_id = bt_context_add_trace(ctx,
 580                                 node->fts_accpath, format_str,
 581                                 packet_seek, NULL, NULL);
 582                         if (trace_id < 0) {
 583                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 584                                         "for reading.\n", node->fts_accpath, path);
 585                                 /* Allow to skip erroneous traces. */
 586                                 continue;
 587                         }
 588                         g_array_append_val(trace_ids, trace_id);
 589                 }
 590         }
 591
 592         g_array_free(trace_ids, TRUE);
 593         return ret;
 594
 595 error:
 596         return ret;
 597 }
 598
 599 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 600                 int field_cnt, int *tid_check, int *pid_check,
 601                 int *procname_check, int *ppid_check)
 602 {
 603         int j;
 604         struct perfcounter *global;
 605         const char *name;
 606
 607         for (j = 0; j < field_cnt; j++) {
 608                 name = bt_ctf_get_decl_field_name(field_list[j]);
 609                 if (*tid_check == 0) {
 610                         if (strncmp(name, "tid", 3) == 0)
 611                                 (*tid_check)++;
 612                 }
 613                 if (*pid_check == 0) {
 614                         if (strncmp(name, "pid", 3) == 0)
 615                                 (*pid_check)++;
 616                 }
 617                 if (*ppid_check == 0) {
 618                         if (strncmp(name, "ppid", 4) == 0)
 619                                 (*ppid_check)++;
 620                 }
 621                 if (*procname_check == 0) {
 622                         if (strncmp(name, "procname", 8) == 0)
 623                                 (*procname_check)++;
 624                 }
 625                 if (strncmp(name, "perf_", 5) == 0) {
 626                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 627                         if (!global) {
 628                                 global = g_new0(struct perfcounter, 1);
 629                                 /* by default, sort on the first perf context */
 630                                 if (g_hash_table_size(global_perf_liszt) == 0)
 631                                         global->sort = 1;
 632                                 global->visible = 1;
 633                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 634                         }
 635                 }
 636         }
 637
 638         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 639                         *procname_check == 1)
 640                 return 0;
 641
 642         return -1;
 643 }
 644
 645 /*
 646  * check_requirements: check if the required context informations are available
 647  *
 648  * If each mandatory context information is available for at least in one
 649  * event, return 0 otherwise return -1.
 650  */
 651 int check_requirements(struct bt_context *ctx)
 652 {
 653         unsigned int i, evt_cnt, field_cnt;
 654         struct bt_ctf_event_decl *const * evt_list;
 655         const struct bt_ctf_field_decl *const * field_list;
 656         int tid_check = 0;
 657         int pid_check = 0;
 658         int procname_check = 0;
 659         int ppid_check = 0;
 660         int ret = 0;
 661
 662         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 663         for (i = 0; i < evt_cnt; i++) {
 664                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 665                                 &field_list, &field_cnt);
 666                 ret = check_field_requirements(field_list, field_cnt,
 667                                 &tid_check, &pid_check, &procname_check,
 668                                 &ppid_check);
 669
 670                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 671                                 &field_list, &field_cnt);
 672                 ret = check_field_requirements(field_list, field_cnt,
 673                                 &tid_check, &pid_check, &procname_check,
 674                                 &ppid_check);
 675
 676                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 677                                 &field_list, &field_cnt);
 678                 ret = check_field_requirements(field_list, field_cnt,
 679                                 &tid_check, &pid_check, &procname_check,
 680                                 &ppid_check);
 681         }
 682
 683         if (tid_check == 0) {
 684                 ret = -1;
 685                 fprintf(stderr, "[error] missing tid context information\n");
 686         }
 687         if (pid_check == 0) {
 688                 ret = -1;
 689                 fprintf(stderr, "[error] missing pid context information\n");
 690         }
 691         if (ppid_check == 0) {
 692                 ret = -1;
 693                 fprintf(stderr, "[error] missing ppid context information\n");
 694         }
 695         if (procname_check == 0) {
 696                 ret = -1;
 697                 fprintf(stderr, "[error] missing procname context information\n");
 698         }
 699
 700         return ret;
 701 }
 702
 703 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 704                 struct lttng_consumer_local_data *ctx)
 705 {
 706         unsigned long len;
 707         int err;
 708         long ret = 0;
 709         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 710
 711         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 712                 /* Get the next subbuffer */
 713                 err = helper_kernctl_get_next_subbuf(infd);
 714                 if (err != 0) {
 715                         ret = errno;
 716                         perror("Reserving sub buffer failed (everything is normal, "
 717                                         "it is due to concurrency)");
 718                         goto end;
 719                 }
 720                 /* read the whole subbuffer */
 721                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 722                 if (err != 0) {
 723                         ret = errno;
 724                         perror("Getting sub-buffer len failed.");
 725                         goto end;
 726                 }
 727
 728                 /* splice the subbuffer to the tracefile */
 729                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 730                 if (ret < 0) {
 731                         /*
 732                          * display the error but continue processing to try
 733                          * to release the subbuffer
 734                          */
 735                         fprintf(stderr,"Error splicing to tracefile\n");
 736                 }
 737                 err = helper_kernctl_put_next_subbuf(infd);
 738                 if (err != 0) {
 739                         ret = errno;
 740                         perror("Reserving sub buffer failed (everything is normal, "
 741                                         "it is due to concurrency)");
 742                         goto end;
 743                 }
 744                 sem_post(&metadata_available);
 745         }
 746
 747 end:
 748         return 0;
 749 }
 750
 751 int on_update_fd(int key, uint32_t state)
 752 {
 753         /* let the lib handle the metadata FD */
 754         if (key == sessiond_metadata)
 755                 return 0;
 756         return 1;
 757 }
 758
 759 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
 760 {
 761         int ret;
 762         struct mmap_stream *new_mmap_stream;
 763
 764         /* Opening the tracefile in write mode */
 765         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
 766                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
 767                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
 768                 if (ret < 0) {
 769                         perror("open");
 770                         goto end;
 771                 }
 772                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
 773         }
 774
 775         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
 776                 new_mmap_stream = malloc(sizeof(struct mmap_stream));
 777                 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
 778                                 kconsumerd_fd);
 779                 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
 780
 781                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
 782                 /* keep mmap FDs internally */
 783                 ret = 1;
 784         } else {
 785                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 786                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
 787                 ret = 0;
 788         }
 789
 790         reload_trace = 1;
 791
 792 end:
 793         return ret;
 794 }
 795
 796 void live_consume(struct bt_context **bt_ctx)
 797 {
 798         int ret;
 799         FILE *metadata_fp;
 800
 801         sem_wait(&metadata_available);
 802         if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 803                 fprintf(stderr,"no metadata\n");
 804                 goto end;
 805         }
 806         metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 807
 808         *bt_ctx = bt_context_create();
 809         ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
 810                         lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
 811         if (ret < 0) {
 812                 printf("Error adding trace\n");
 813                 goto end;
 814         }
 815
 816 end:
 817         return;
 818 }
 819
 820 int setup_consumer(char *command_sock_path, pthread_t *threads,
 821                 struct lttng_consumer_local_data *ctx)
 822 {
 823         int ret = 0;
 824
 825         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 826                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 827         if (!ctx)
 828                 goto end;
 829
 830         unlink(command_sock_path);
 831         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 832         helper_lttng_consumer_init();
 833
 834         /* Create the thread to manage the receive of fd */
 835         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 836                         (void *) ctx);
 837         if (ret != 0) {
 838                 perror("pthread_create receive fd");
 839                 goto end;
 840         }
 841         /* Create thread to manage the polling/writing of traces */
 842         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 843                         (void *) ctx);
 844         if (ret != 0) {
 845                 perror("pthread_create poll fd");
 846                 goto end;
 847         }
 848
 849 end:
 850         return ret;
 851 }
 852
 853 int setup_live_tracing()
 854 {
 855         struct lttng_domain dom;
 856         struct lttng_channel chan;
 857         char *channel_name = "mmapchan";
 858         struct lttng_event ev;
 859         int ret = 0;
 860         char *command_sock_path = "/tmp/consumerd_sock";
 861         static pthread_t threads[2]; /* recv_fd, poll */
 862         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 863
 864         struct lttng_handle *handle;
 865
 866         BT_INIT_LIST_HEAD(&mmap_list.head);
 867
 868         lttng_consumer_stream_array = g_ptr_array_new();
 869
 870         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 871                 fprintf(stderr,"error setting up consumer\n");
 872                 goto error;
 873         }
 874
 875         available_snapshots = g_ptr_array_new();
 876
 877         /* setup the session */
 878         dom.type = LTTNG_DOMAIN_KERNEL;
 879
 880         ret = unlink("/tmp/livesession");
 881
 882         lttng_destroy_session("test");
 883         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 884                 fprintf(stderr,"error creating the session : %s\n",
 885                                 helper_lttcomm_get_readable_code(ret));
 886                 goto error;
 887         }
 888
 889         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 890                 fprintf(stderr,"error creating handle\n");
 891                 goto error_session;
 892         }
 893
 894         /*
 895          * FIXME : need to let the
 896          * helper_lttng_consumer_thread_receive_fds create the
 897          * socket.
 898          * Cleaner solution ?
 899          */
 900         while (access(command_sock_path, F_OK)) {
 901                 sleep(0.1);
 902         }
 903
 904         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 905                 fprintf(stderr,"error registering consumer : %s\n",
 906                                 helper_lttcomm_get_readable_code(ret));
 907                 goto error_session;
 908         }
 909
 910         strcpy(chan.name, channel_name);
 911         chan.attr.overwrite = 0;
 912 //      chan.attr.subbuf_size = 32768;
 913         chan.attr.subbuf_size = 1048576; /* 1MB */
 914         chan.attr.num_subbuf = 4;
 915         chan.attr.switch_timer_interval = 0;
 916         chan.attr.read_timer_interval = 200;
 917         chan.attr.output = LTTNG_EVENT_MMAP;
 918
 919         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
 920                 fprintf(stderr,"error creating channel : %s\n",
 921                                 helper_lttcomm_get_readable_code(ret));
 922                 goto error_session;
 923         }
 924
 925         memset(&ev, '\0', sizeof(struct lttng_event));
 926         //sprintf(ev.name, "sched_switch");
 927         ev.type = LTTNG_EVENT_TRACEPOINT;
 928         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 929                 fprintf(stderr,"error enabling event : %s\n",
 930                                 helper_lttcomm_get_readable_code(ret));
 931                 goto error_session;
 932         }
 933
 934         ev.type = LTTNG_EVENT_SYSCALL;
 935         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 936                 fprintf(stderr,"error enabling syscalls : %s\n",
 937                                 helper_lttcomm_get_readable_code(ret));
 938                 goto error_session;
 939         }
 940
 941         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
 942         lttng_add_context(handle, &kctxpid, NULL, NULL);
 943         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
 944         lttng_add_context(handle, &kctxppid, NULL, NULL);
 945         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
 946         lttng_add_context(handle, &kctxcomm, NULL, NULL);
 947         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
 948         lttng_add_context(handle, &kctxtid, NULL, NULL);
 949         kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
 950         lttng_add_context(handle, &kctxpid, NULL, NULL);
 951         kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
 952         lttng_add_context(handle, &kctxtid, NULL, NULL);
 953
 954         if ((ret = lttng_start_tracing("test")) < 0) {
 955                 fprintf(stderr,"error starting tracing : %s\n",
 956                                 helper_lttcomm_get_readable_code(ret));
 957                 goto error_session;
 958         }
 959
 960         helper_kernctl_buffer_flush(consumerd_metadata);
 961
 962         /* block until metadata is ready */
 963         sem_init(&metadata_available, 0, 0);
 964
 965         return 0;
 966
 967 error_session:
 968         lttng_destroy_session("test");
 969 error:
 970         return -1;
 971 }
 972
 973 int main(int argc, char **argv)
 974 {
 975         int ret;
 976         struct bt_context *bt_ctx = NULL;
 977         struct mmap_stream *mmap_info;
 978         unsigned long mmap_len;
 979
 980         ret = parse_options(argc, argv);
 981         if (ret < 0) {
 982                 fprintf(stdout, "Error parsing options.\n\n");
 983                 usage(stdout);
 984                 exit(EXIT_FAILURE);
 985         } else if (ret > 0) {
 986                 exit(EXIT_SUCCESS);
 987         }
 988
 989         if (!opt_input_path) {
 990                 ret = setup_live_tracing();
 991                 if (ret < 0) {
 992                         goto end;
 993                 }
 994                 init_lttngtop();
 995                 if (!opt_textdump) {
 996                         pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
 997                         pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
 998                 }
 999                 while (!quit) {
1000                         reload_trace = 0;
1001                         live_consume(&bt_ctx);
1002                         iter_trace(bt_ctx);
1003                         ret = bt_context_remove_trace(bt_ctx, 0);
1004                         if (ret != 0)
1005                                 fprintf(stderr, "error removing trace\n");
1006                         if (bt_ctx) {
1007                                 bt_context_put(bt_ctx);
1008                         }
1009
1010                         /*
1011                          * since we receive all FDs every time there is an
1012                          * update and the FD number is different every time,
1013                          * we don't know which one are valid.
1014                          * so we check if all FDs are usable with a simple
1015                          * ioctl call.
1016                          */
1017                         bt_list_for_each_entry(mmap_info, &mmap_list.head, list) {
1018                                 ret = helper_kernctl_get_mmap_len(mmap_info->fd, &mmap_len);
1019                                 if (ret != 0) {
1020                                         bt_list_del(&mmap_info->list);
1021                                 }
1022                         }
1023                         sem_post(&metadata_available);
1024                 }
1025
1026                 pthread_join(timer_thread, NULL);
1027                 quit = 1;
1028                 pthread_join(display_thread, NULL);
1029
1030                 lttng_stop_tracing("test");
1031                 lttng_destroy_session("test");
1032
1033                 goto end;
1034         } else {
1035                 init_lttngtop();
1036
1037                 bt_ctx = bt_context_create();
1038                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1039                 if (ret < 0) {
1040                         fprintf(stderr, "[error] Opening the trace\n");
1041                         goto end;
1042                 }
1043
1044                 ret = check_requirements(bt_ctx);
1045                 if (ret < 0) {
1046                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1047                         goto end;
1048                 }
1049                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1050                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1051
1052                 iter_trace(bt_ctx);
1053
1054                 pthread_join(display_thread, NULL);
1055                 quit = 1;
1056                 pthread_join(timer_thread, NULL);
1057         }
1058
1059 end:
1060         if (bt_ctx)
1061                 bt_context_put(bt_ctx);
1062
1063         return 0;
1064 }