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
  55 struct lttngtop *copy;
  56 pthread_t display_thread;
  57 pthread_t timer_thread;
  58 pthread_t live_trace_thread;
  59
  60 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  61 unsigned long last_display_update = 0;
  62 int quit = 0;
  63
  64 /* LIVE */
  65 pthread_t thread_live_consume;
  66 /* list of FDs available for being read with snapshots */
  67 struct mmap_stream_list mmap_list;
  68 GPtrArray *lttng_consumer_stream_array;
  69 int sessiond_metadata, consumerd_metadata;
  70 struct lttng_consumer_local_data *ctx = NULL;
  71 /* list of snapshots currently not consumed */
  72 GPtrArray *available_snapshots;
  73 sem_t metadata_available;
  74 FILE *metadata_fp;
  75 int trace_opened = 0;
  76 int metadata_ready = 0;
  77
  78 enum {
  79         OPT_NONE = 0,
  80         OPT_HELP,
  81         OPT_LIST,
  82         OPT_VERBOSE,
  83         OPT_DEBUG,
  84         OPT_NAMES,
  85 };
  86
  87 static struct poptOption long_options[] = {
  88         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  89         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  90         { NULL, 0, 0, NULL, 0, NULL, NULL },
  91 };
  92
  93 void *refresh_thread(void *p)
  94 {
  95         while (1) {
  96                 if (quit)
  97                         return NULL;
  98                 sem_wait(&pause_sem);
  99                 sem_post(&pause_sem);
 100                 sem_post(&timer);
 101                 sleep(refresh_display/NSEC_PER_SEC);
 102         }
 103 }
 104
 105 void *ncurses_display(void *p)
 106 {
 107         unsigned int current_display_index = 0;
 108
 109         sem_wait(&bootstrap);
 110         /*
 111          * Prevent the 1 second delay when we hit ESC
 112          */
 113         ESCDELAY = 0;
 114         init_ncurses();
 115
 116         while (1) {
 117                 sem_wait(&timer);
 118                 sem_wait(&goodtodisplay);
 119                 sem_wait(&pause_sem);
 120
 121                 copy = g_ptr_array_index(copies, current_display_index);
 122                 assert(copy);
 123                 display(current_display_index++);
 124
 125                 sem_post(&goodtoupdate);
 126                 sem_post(&pause_sem);
 127
 128                 if (quit) {
 129                         reset_ncurses();
 130                         pthread_exit(0);
 131                 }
 132         }
 133 }
 134
 135 /* FIXME : TMP */
 136 struct tm ts_format_timestamp(uint64_t timestamp)
 137 {
 138         struct tm tm;
 139         uint64_t ts_sec = 0, ts_nsec;
 140         time_t time_s;
 141
 142         ts_nsec = timestamp;
 143         ts_sec += ts_nsec / NSEC_PER_SEC;
 144         ts_nsec = ts_nsec % NSEC_PER_SEC;
 145
 146         time_s = (time_t) ts_sec;
 147
 148         localtime_r(&time_s, &tm);
 149
 150         return tm;
 151 }
 152
 153 /*
 154  * hook on each event to check the timestamp and refresh the display if
 155  * necessary
 156  */
 157 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
 158 {
 159         unsigned long timestamp;
 160         struct tm start;
 161         uint64_t ts_nsec_start, ts_nsec_end;
 162
 163
 164         timestamp = bt_ctf_get_timestamp(call_data);
 165
 166         start = ts_format_timestamp(timestamp);
 167         ts_nsec_start = timestamp % NSEC_PER_SEC;
 168
 169 //      printf("%02d:%02d:%02d.%09" PRIu64 "\n", start.tm_hour, start.tm_min, start.tm_sec, ts_nsec_start);
 170
 171         return BT_CB_OK;
 172 }
 173
 174 /*
 175  * hook on each event to check the timestamp and refresh the display if
 176  * necessary
 177  */
 178 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 179 {
 180         unsigned long timestamp;
 181
 182         timestamp = bt_ctf_get_timestamp(call_data);
 183         if (timestamp == -1ULL)
 184                 goto error;
 185
 186         if (last_display_update == 0)
 187                 last_display_update = timestamp;
 188
 189         if (timestamp - last_display_update >= refresh_display) {
 190                 sem_wait(&goodtoupdate);
 191                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 192                                         timestamp));
 193                 sem_post(&goodtodisplay);
 194                 sem_post(&bootstrap);
 195                 last_display_update = timestamp;
 196         }
 197         return BT_CB_OK;
 198
 199 error:
 200         fprintf(stderr, "check_timestamp callback error\n");
 201         return BT_CB_ERROR_STOP;
 202 }
 203
 204 /*
 205  * get_perf_counter : get or create and return a perf_counter struct for
 206  * either a process or a cpu (only one of the 2 parameters mandatory)
 207  */
 208 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 209                 struct cputime *cpu)
 210 {
 211         struct perfcounter *ret;
 212         GHashTable *table;
 213
 214         if (proc)
 215                 table = proc->perf;
 216         else if (cpu)
 217                 table = cpu->perf;
 218         else
 219                 goto error;
 220
 221         ret = g_hash_table_lookup(table, (gpointer) name);
 222         if (ret)
 223                 goto end;
 224
 225         ret = g_new0(struct perfcounter, 1);
 226         /* by default, make it visible in the UI */
 227         ret->visible = 1;
 228         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 229
 230 end:
 231         return ret;
 232
 233 error:
 234         return NULL;
 235 }
 236
 237 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 238                 const char *name, int value)
 239 {
 240         struct perfcounter *cpu_perf, *process_perf;
 241
 242         cpu_perf = get_perf_counter(name, NULL, cpu);
 243         if (cpu_perf->count < value) {
 244                 process_perf = get_perf_counter(name, proc, NULL);
 245                 process_perf->count += value - cpu_perf->count;
 246                 cpu_perf->count = value;
 247         }
 248 }
 249
 250 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 251                 const struct bt_definition *scope,
 252                 struct processtop *proc,
 253                 struct cputime *cpu)
 254 {
 255         struct bt_definition const * const *list = NULL;
 256         const struct bt_definition *field;
 257         unsigned int count;
 258         struct perfcounter *perfcounter;
 259         GHashTableIter iter;
 260         gpointer key;
 261         int ret;
 262
 263         if (!scope)
 264                 goto end;
 265
 266         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 267         if (ret < 0)
 268                 goto end;
 269
 270         if (count == 0)
 271                 goto end;
 272
 273         g_hash_table_iter_init(&iter, global_perf_liszt);
 274         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 275                 field = bt_ctf_get_field(event, scope, (char *) key);
 276                 if (field) {
 277                         int value = bt_ctf_get_uint64(field);
 278                         if (bt_ctf_field_get_error())
 279                                 continue;
 280                         update_perf_value(proc, cpu, (char *) key, value);
 281                 }
 282         }
 283
 284 end:
 285         return;
 286 }
 287
 288 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 289 {
 290         struct cputime *cpu;
 291         const struct bt_definition *scope;
 292
 293         cpu = get_cpu(get_cpu_id(event));
 294
 295         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 296         extract_perf_counter_scope(event, scope, proc, cpu);
 297
 298         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 299         extract_perf_counter_scope(event, scope, proc, cpu);
 300
 301         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 302         extract_perf_counter_scope(event, scope, proc, cpu);
 303 }
 304
 305 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 306                 void *private_data)
 307 {
 308         int pid, tid, ppid;
 309         char *comm;
 310         struct processtop *parent, *child;
 311         unsigned long timestamp;
 312
 313         timestamp = bt_ctf_get_timestamp(call_data);
 314         if (timestamp == -1ULL)
 315                 goto error;
 316
 317         pid = get_context_pid(call_data);
 318         if (pid == -1ULL) {
 319                 goto error;
 320         }
 321         tid = get_context_tid(call_data);
 322         if (tid == -1ULL) {
 323                 goto error;
 324         }
 325         ppid = get_context_ppid(call_data);
 326         if (ppid == -1ULL) {
 327                 goto error;
 328         }
 329         comm = get_context_comm(call_data);
 330         if (!comm) {
 331                 goto error;
 332         }
 333
 334         /* find or create the current process */
 335         child = find_process_tid(&lttngtop, tid, comm);
 336         if (!child)
 337                 child = add_proc(&lttngtop, tid, comm, timestamp);
 338         update_proc(child, pid, tid, ppid, comm);
 339
 340         if (pid != tid) {
 341                 /* find or create the parent */
 342                 parent = find_process_tid(&lttngtop, pid, comm);
 343                 if (!parent) {
 344                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 345                         parent->pid = pid;
 346                 }
 347
 348                 /* attach the parent to the current process */
 349                 child->threadparent = parent;
 350                 add_thread(parent, child);
 351         }
 352
 353         update_perf_counter(child, call_data);
 354
 355         return BT_CB_OK;
 356
 357 error:
 358         return BT_CB_ERROR_STOP;
 359 }
 360
 361 void init_lttngtop()
 362 {
 363         copies = g_ptr_array_new();
 364         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 365
 366         sem_init(&goodtodisplay, 0, 0);
 367         sem_init(&goodtoupdate, 0, 1);
 368         sem_init(&timer, 0, 1);
 369         sem_init(&bootstrap, 0, 0);
 370         sem_init(&pause_sem, 0, 1);
 371         sem_init(&end_trace_sem, 0, 0);
 372
 373         reset_global_counters();
 374         lttngtop.nbproc = 0;
 375         lttngtop.nbthreads = 0;
 376         lttngtop.nbfiles = 0;
 377
 378         lttngtop.process_table = g_ptr_array_new();
 379         lttngtop.files_table = g_ptr_array_new();
 380         lttngtop.cpu_table = g_ptr_array_new();
 381 }
 382
 383 void usage(FILE *fp)
 384 {
 385         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 386         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 387 }
 388
 389 /*
 390  * Return 0 if caller should continue, < 0 if caller should return
 391  * error, > 0 if caller should exit without reporting error.
 392  */
 393 static int parse_options(int argc, char **argv)
 394 {
 395         poptContext pc;
 396         int opt, ret = 0;
 397
 398         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 399         poptReadDefaultConfig(pc, 0);
 400
 401         while ((opt = poptGetNextOpt(pc)) != -1) {
 402                 switch (opt) {
 403                         case OPT_HELP:
 404                                 usage(stdout);
 405                                 ret = 1;    /* exit cleanly */
 406                                 goto end;
 407                         default:
 408                                 ret = -EINVAL;
 409                                 goto end;
 410                 }
 411         }
 412
 413         opt_input_path = poptGetArg(pc);
 414
 415 end:
 416         if (pc) {
 417                 poptFreeContext(pc);
 418         }
 419         return ret;
 420 }
 421
 422 void iter_trace(struct bt_context *bt_ctx)
 423 {
 424         struct bt_ctf_iter *iter;
 425         struct bt_iter_pos begin_pos;
 426         const struct bt_ctf_event *event;
 427         int ret = 0;
 428
 429         begin_pos.type = BT_SEEK_BEGIN;
 430         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 431
 432         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 433                         print_timestamp,
 434                         NULL, NULL, NULL);
 435
 436 #if 0
 437         /* at each event check if we need to refresh */
 438         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 439                         check_timestamp,
 440                         NULL, NULL, NULL);
 441         /* at each event, verify the status of the process table */
 442         bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 443                         fix_process_table,
 444                         NULL, NULL, NULL);
 445         /* to handle the scheduling events */
 446         bt_ctf_iter_add_callback(iter,
 447                         g_quark_from_static_string("sched_switch"),
 448                         NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 449         /* to clean up the process table */
 450         bt_ctf_iter_add_callback(iter,
 451                         g_quark_from_static_string("sched_process_free"),
 452                         NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 453         /* to get all the process from the statedumps */
 454         bt_ctf_iter_add_callback(iter,
 455                         g_quark_from_static_string(
 456                                 "lttng_statedump_process_state"),
 457                         NULL, 0, handle_statedump_process_state,
 458                         NULL, NULL, NULL);
 459
 460         /* for IO top */
 461         bt_ctf_iter_add_callback(iter,
 462                         g_quark_from_static_string("exit_syscall"),
 463                         NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 464         bt_ctf_iter_add_callback(iter,
 465                         g_quark_from_static_string("sys_write"),
 466                         NULL, 0, handle_sys_write, NULL, NULL, NULL);
 467         bt_ctf_iter_add_callback(iter,
 468                         g_quark_from_static_string("sys_read"),
 469                         NULL, 0, handle_sys_read, NULL, NULL, NULL);
 470         bt_ctf_iter_add_callback(iter,
 471                         g_quark_from_static_string("sys_open"),
 472                         NULL, 0, handle_sys_open, NULL, NULL, NULL);
 473         bt_ctf_iter_add_callback(iter,
 474                         g_quark_from_static_string("sys_close"),
 475                         NULL, 0, handle_sys_close, NULL, NULL, NULL);
 476         bt_ctf_iter_add_callback(iter,
 477                         g_quark_from_static_string(
 478                                         "lttng_statedump_file_descriptor"),
 479                         NULL, 0, handle_statedump_file_descriptor,
 480                         NULL, NULL, NULL);
 481 #endif
 482         while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
 483                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 484                 if (ret < 0)
 485                         goto end_iter;
 486         }
 487
 488         /* block until quit, we reached the end of the trace */
 489         sem_wait(&end_trace_sem);
 490
 491 end_iter:
 492         bt_ctf_iter_destroy(iter);
 493 }
 494
 495 /*
 496  * bt_context_add_traces_recursive: Open a trace recursively
 497  * (copied from BSD code in converter/babeltrace.c)
 498  *
 499  * Find each trace present in the subdirectory starting from the given
 500  * path, and add them to the context. The packet_seek parameter can be
 501  * NULL: this specify to use the default format packet_seek.
 502  *
 503  * Return: 0 on success, nonzero on failure.
 504  * Unable to open toplevel: failure.
 505  * Unable to open some subdirectory or file: warn and continue;
 506  */
 507 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 508                 const char *format_str,
 509                 void (*packet_seek)(struct bt_stream_pos *pos,
 510                         size_t offset, int whence))
 511 {
 512         FTS *tree;
 513         FTSENT *node;
 514         GArray *trace_ids;
 515         char lpath[PATH_MAX];
 516         char * const paths[2] = { lpath, NULL };
 517         int ret = -1;
 518
 519         /*
 520          * Need to copy path, because fts_open can change it.
 521          * It is the pointer array, not the strings, that are constant.
 522          */
 523         strncpy(lpath, path, PATH_MAX);
 524         lpath[PATH_MAX - 1] = '\0';
 525
 526         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 527         if (tree == NULL) {
 528                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 529                                 path);
 530                 return -EINVAL;
 531         }
 532
 533         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 534
 535         while ((node = fts_read(tree))) {
 536                 int dirfd, metafd;
 537
 538                 if (!(node->fts_info & FTS_D))
 539                         continue;
 540
 541                 dirfd = open(node->fts_accpath, 0);
 542                 if (dirfd < 0) {
 543                         fprintf(stderr, "[error] [Context] Unable to open trace "
 544                                 "directory file descriptor.\n");
 545                         ret = dirfd;
 546                         goto error;
 547                 }
 548                 metafd = openat(dirfd, "metadata", O_RDONLY);
 549                 if (metafd < 0) {
 550                         close(dirfd);
 551                         ret = -1;
 552                         continue;
 553                 } else {
 554                         int trace_id;
 555
 556                         ret = close(metafd);
 557                         if (ret < 0) {
 558                                 perror("close");
 559                                 goto error;
 560                         }
 561                         ret = close(dirfd);
 562                         if (ret < 0) {
 563                                 perror("close");
 564                                 goto error;
 565                         }
 566
 567                         trace_id = bt_context_add_trace(ctx,
 568                                 node->fts_accpath, format_str,
 569                                 packet_seek, NULL, NULL);
 570                         if (trace_id < 0) {
 571                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 572                                         "for reading.\n", node->fts_accpath, path);
 573                                 /* Allow to skip erroneous traces. */
 574                                 continue;
 575                         }
 576                         g_array_append_val(trace_ids, trace_id);
 577                 }
 578         }
 579
 580         g_array_free(trace_ids, TRUE);
 581         return ret;
 582
 583 error:
 584         return ret;
 585 }
 586
 587 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 588                 int field_cnt, int *tid_check, int *pid_check,
 589                 int *procname_check, int *ppid_check)
 590 {
 591         int j;
 592         struct perfcounter *global;
 593         const char *name;
 594
 595         for (j = 0; j < field_cnt; j++) {
 596                 name = bt_ctf_get_decl_field_name(field_list[j]);
 597                 if (*tid_check == 0) {
 598                         if (strncmp(name, "tid", 3) == 0)
 599                                 (*tid_check)++;
 600                 }
 601                 if (*pid_check == 0) {
 602                         if (strncmp(name, "pid", 3) == 0)
 603                                 (*pid_check)++;
 604                 }
 605                 if (*ppid_check == 0) {
 606                         if (strncmp(name, "ppid", 4) == 0)
 607                                 (*ppid_check)++;
 608                 }
 609                 if (*procname_check == 0) {
 610                         if (strncmp(name, "procname", 8) == 0)
 611                                 (*procname_check)++;
 612                 }
 613                 if (strncmp(name, "perf_", 5) == 0) {
 614                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 615                         if (!global) {
 616                                 global = g_new0(struct perfcounter, 1);
 617                                 /* by default, sort on the first perf context */
 618                                 if (g_hash_table_size(global_perf_liszt) == 0)
 619                                         global->sort = 1;
 620                                 global->visible = 1;
 621                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 622                         }
 623                 }
 624         }
 625
 626         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 627                         *procname_check == 1)
 628                 return 0;
 629
 630         return -1;
 631 }
 632
 633 /*
 634  * check_requirements: check if the required context informations are available
 635  *
 636  * If each mandatory context information is available for at least in one
 637  * event, return 0 otherwise return -1.
 638  */
 639 int check_requirements(struct bt_context *ctx)
 640 {
 641         unsigned int i, evt_cnt, field_cnt;
 642         struct bt_ctf_event_decl *const * evt_list;
 643         const struct bt_ctf_field_decl *const * field_list;
 644         int tid_check = 0;
 645         int pid_check = 0;
 646         int procname_check = 0;
 647         int ppid_check = 0;
 648         int ret = 0;
 649
 650         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 651         for (i = 0; i < evt_cnt; i++) {
 652                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 653                                 &field_list, &field_cnt);
 654                 ret = check_field_requirements(field_list, field_cnt,
 655                                 &tid_check, &pid_check, &procname_check,
 656                                 &ppid_check);
 657
 658                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 659                                 &field_list, &field_cnt);
 660                 ret = check_field_requirements(field_list, field_cnt,
 661                                 &tid_check, &pid_check, &procname_check,
 662                                 &ppid_check);
 663
 664                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_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
 671         if (tid_check == 0) {
 672                 ret = -1;
 673                 fprintf(stderr, "[error] missing tid context information\n");
 674         }
 675         if (pid_check == 0) {
 676                 ret = -1;
 677                 fprintf(stderr, "[error] missing pid context information\n");
 678         }
 679         if (ppid_check == 0) {
 680                 ret = -1;
 681                 fprintf(stderr, "[error] missing ppid context information\n");
 682         }
 683         if (procname_check == 0) {
 684                 ret = -1;
 685                 fprintf(stderr, "[error] missing procname context information\n");
 686         }
 687
 688         return ret;
 689 }
 690
 691 void dump_snapshot()
 692 {
 693 #if 0
 694         struct lttng_consumer_stream *iter;
 695         unsigned long spos;
 696         struct mmap_stream *new_snapshot;
 697
 698         int ret = 0;
 699         int i;
 700         /*
 701          * try lock mutex ressource courante (overrun)
 702          * if fail : overrun
 703          * stop trace (flush implicite avant stop)
 704          * lttng_consumer_take_snapshot
 705          * read timestamp packet end (use time as end pos)
 706          *      - stream_packet_context
 707          *      - reculer de 1 subbuf : pos - max_subbuff_size
 708          *
 709          *      - position de fin (take_snapshot)
 710          *      - mov_pos_slow ( fin - max_subbuff_size) lire timestamp packet end
 711          *      - prend min(end) (activité sur tous les streams)
 712          *
 713          * start trace
 714          * unlock mutex
 715          */
 716
 717         helper_kernctl_buffer_flush(consumerd_metadata);
 718         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 719                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 720                 helper_kernctl_buffer_flush(helper_get_lttng_consumer_stream_wait_fd(iter));
 721                 printf("Taking snapshot of fd : %d\n", helper_get_lttng_consumer_stream_wait_fd(iter));
 722                 ret = helper_lttng_consumer_take_snapshot(ctx, iter);
 723                 if (ret != 0) {
 724                         ret = errno;
 725                         perror("lttng_consumer_take_snapshots");
 726                         goto end;
 727                 }
 728         }
 729         for (i = 0; i < lttng_consumer_stream_array->len; i++) {
 730                 iter = g_ptr_array_index(lttng_consumer_stream_array, i);
 731                 ret = helper_lttng_consumer_get_produced_snapshot(ctx, iter, &spos);
 732                 if (ret != 0) {
 733                         ret = errno;
 734                         perror("helper_lttng_consumer_get_produced_snapshot");
 735                         goto end;
 736                 }
 737                 while (helper_get_lttng_consumer_stream_wait_last_pos(iter) < spos) {
 738                         new_snapshot = g_new0(struct mmap_stream, 1);
 739                         new_snapshot->fd = helper_get_lttng_consumer_stream_wait_fd(iter);
 740                         new_snapshot->last_pos = helper_get_lttng_consumer_stream_wait_last_pos(iter);
 741                         fprintf(stderr,"ADDING AVAILABLE SNAPSHOT ON FD %d AT POSITION %lu\n",
 742                                         new_snapshot->fd,
 743                                         new_snapshot->last_pos);
 744                         g_ptr_array_add(available_snapshots, new_snapshot);
 745                         helper_set_lttng_consumer_stream_wait_last_pos(iter,
 746                                 helper_get_lttng_consumer_stream_wait_last_pos(iter) +
 747                                 helper_get_lttng_consumer_stream_chan_max_sb_size(iter));
 748                 }
 749         }
 750
 751         if (!metadata_ready) {
 752                 fprintf(stderr, "BLOCKING BEFORE METADATA\n");
 753                 sem_wait(&metadata_available);
 754                 fprintf(stderr,"OPENING TRACE\n");
 755                 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 756                         fprintf(stderr,"NO METADATA FILE, SKIPPING\n");
 757                         return;
 758                 }
 759                 metadata_ready = 1;
 760                 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 761         }
 762
 763
 764 end:
 765         return;
 766 #endif
 767 }
 768
 769 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 770                 struct lttng_consumer_local_data *ctx)
 771 {
 772         unsigned long len;
 773         int err;
 774         long ret = 0;
 775         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 776
 777         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 778                 /* Get the next subbuffer */
 779                 printf("get_next : %d\n", infd);
 780                 err = helper_kernctl_get_next_subbuf(infd);
 781                 if (err != 0) {
 782                         ret = errno;
 783                         perror("Reserving sub buffer failed (everything is normal, "
 784                                         "it is due to concurrency)");
 785                         goto end;
 786                 }
 787                 /* read the whole subbuffer */
 788                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 789                 if (err != 0) {
 790                         ret = errno;
 791                         perror("Getting sub-buffer len failed.");
 792                         goto end;
 793                 }
 794                 printf("len : %ld\n", len);
 795
 796                 /* splice the subbuffer to the tracefile */
 797                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 798                 if (ret < 0) {
 799                         /*
 800                          * display the error but continue processing to try
 801                          * to release the subbuffer
 802                          */
 803                         fprintf(stderr,"Error splicing to tracefile\n");
 804                 }
 805                 printf("ret : %ld\n", ret);
 806                 printf("put_next : %d\n", infd);
 807                 err = helper_kernctl_put_next_subbuf(infd);
 808                 if (err != 0) {
 809                         ret = errno;
 810                         perror("Reserving sub buffer failed (everything is normal, "
 811                                         "it is due to concurrency)");
 812                         goto end;
 813                 }
 814                 sem_post(&metadata_available);
 815         }
 816
 817 end:
 818         return 0;
 819 }
 820
 821 int on_update_fd(int key, uint32_t state)
 822 {
 823         /* let the lib handle the metadata FD */
 824         if (key == sessiond_metadata)
 825                 return 0;
 826         return 1;
 827 }
 828
 829 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
 830 {
 831         int ret;
 832         struct mmap_stream *new_info;
 833         size_t tmp_mmap_len;
 834
 835         /* Opening the tracefile in write mode */
 836         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
 837                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
 838                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
 839                 if (ret < 0) {
 840                         perror("open");
 841                         goto end;
 842                 }
 843                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
 844         }
 845
 846         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
 847                 new_info = malloc(sizeof(struct mmap_stream));
 848                 new_info->fd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 849                 bt_list_add(&new_info->list, &mmap_list.head);
 850
 851                 /* get the len of the mmap region */
 852                 ret = helper_kernctl_get_mmap_len(helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd),
 853                                 &tmp_mmap_len);
 854                 if (ret != 0) {
 855                         ret = errno;
 856                         perror("helper_kernctl_get_mmap_len");
 857                         goto end;
 858                 }
 859                 helper_set_lttng_consumer_stream_mmap_len(kconsumerd_fd, tmp_mmap_len);
 860
 861                 helper_set_lttng_consumer_stream_mmap_base(kconsumerd_fd,
 862                                 mmap(NULL, helper_get_lttng_consumer_stream_mmap_len(kconsumerd_fd),
 863                                 PROT_READ, MAP_PRIVATE, helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd), 0));
 864                 if (helper_get_lttng_consumer_stream_mmap_base(kconsumerd_fd) == MAP_FAILED) {
 865                         perror("Error mmaping");
 866                         ret = -1;
 867                         goto end;
 868                 }
 869
 870                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
 871                 /* keep mmap FDs internally */
 872                 ret = 1;
 873         } else {
 874                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 875                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
 876                 ret = 0;
 877         }
 878
 879 end:
 880         return ret;
 881 }
 882
 883 void *live_consume()
 884 {
 885         struct bt_context *bt_ctx = NULL;
 886         int ret;
 887
 888         while (1) {
 889 //              dump_snapshot();
 890
 891                 if (!metadata_ready) {
 892                         fprintf(stderr, "BLOCKING BEFORE METADATA\n");
 893                         sem_wait(&metadata_available);
 894                         fprintf(stderr,"OPENING TRACE\n");
 895                         if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 896                                 fprintf(stderr,"NO METADATA FILE, SKIPPING\n");
 897                                 return NULL;
 898                         }
 899                         metadata_ready = 1;
 900                         metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 901                 }
 902
 903                 if (!trace_opened) {
 904                         bt_ctx = bt_context_create();
 905                         ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
 906                                         lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
 907                         if (ret < 0) {
 908                                 printf("Error adding trace\n");
 909                                 return NULL;
 910                         }
 911                         trace_opened = 1;
 912                 }
 913                 iter_trace(bt_ctx);
 914                 sleep(1);
 915         }
 916 }
 917
 918 int setup_consumer(char *command_sock_path, pthread_t *threads,
 919                 struct lttng_consumer_local_data *ctx)
 920 {
 921         int ret = 0;
 922
 923         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 924                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 925         if (!ctx)
 926                 goto end;
 927
 928         unlink(command_sock_path);
 929         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 930         helper_lttng_consumer_init();
 931
 932         /* Create the thread to manage the receive of fd */
 933         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 934                         (void *) ctx);
 935         if (ret != 0) {
 936                 perror("pthread_create receive fd");
 937                 goto end;
 938         }
 939         /* Create thread to manage the polling/writing of traces */
 940         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 941                         (void *) ctx);
 942         if (ret != 0) {
 943                 perror("pthread_create poll fd");
 944                 goto end;
 945         }
 946
 947 end:
 948         return ret;
 949 }
 950
 951 void *setup_live_tracing()
 952 {
 953         struct lttng_domain dom;
 954         struct lttng_channel chan;
 955         char *channel_name = "mmapchan";
 956         struct lttng_event ev;
 957         int ret = 0;
 958         char *command_sock_path = "/tmp/consumerd_sock";
 959         static pthread_t threads[2]; /* recv_fd, poll */
 960         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 961
 962         struct lttng_handle *handle;
 963
 964         BT_INIT_LIST_HEAD(&mmap_list.head);
 965
 966         lttng_consumer_stream_array = g_ptr_array_new();
 967
 968         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 969                 fprintf(stderr,"error setting up consumer\n");
 970                 goto end;
 971         }
 972
 973         available_snapshots = g_ptr_array_new();
 974
 975         /* setup the session */
 976         dom.type = LTTNG_DOMAIN_KERNEL;
 977
 978         ret = system("rm -rf /tmp/livesession");
 979
 980         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 981                 fprintf(stderr,"error creating the session : %s\n",
 982                                 helper_lttcomm_get_readable_code(ret));
 983                 goto end;
 984         }
 985
 986         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 987                 fprintf(stderr,"error creating handle\n");
 988                 goto end;
 989         }
 990
 991         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 992                 fprintf(stderr,"error registering consumer : %s\n",
 993                                 helper_lttcomm_get_readable_code(ret));
 994                 goto end;
 995         }
 996
 997         strcpy(chan.name, channel_name);
 998         chan.attr.overwrite = 0;
 999         chan.attr.subbuf_size = 32768;
1000 //      chan.attr.subbuf_size = 1048576; /* 1MB */
1001         chan.attr.num_subbuf = 4;
1002         chan.attr.switch_timer_interval = 0;
1003         chan.attr.read_timer_interval = 200;
1004         chan.attr.output = LTTNG_EVENT_MMAP;
1005
1006         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
1007                 fprintf(stderr,"error creating channel : %s\n", helper_lttcomm_get_readable_code(ret));
1008                 goto end;
1009         }
1010
1011         sprintf(ev.name, "sched_switch");
1012         ev.type = LTTNG_EVENT_TRACEPOINT;
1013
1014         //if ((ret = lttng_enable_event(handle, NULL, channel_name)) < 0) {
1015         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1016                 fprintf(stderr,"error enabling event : %s\n", helper_lttcomm_get_readable_code(ret));
1017                 goto end;
1018         }
1019
1020         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
1021         lttng_add_context(handle, &kctxpid, NULL, NULL);
1022         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
1023         lttng_add_context(handle, &kctxppid, NULL, NULL);
1024         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
1025         lttng_add_context(handle, &kctxcomm, NULL, NULL);
1026         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
1027         lttng_add_context(handle, &kctxtid, NULL, NULL);
1028
1029         if ((ret = lttng_start_tracing("test")) < 0) {
1030                 fprintf(stderr,"error starting tracing : %s\n", helper_lttcomm_get_readable_code(ret));
1031                 goto end;
1032         }
1033
1034         helper_kernctl_buffer_flush(consumerd_metadata);
1035
1036         /* Create thread to manage the polling/writing of traces */
1037         ret = pthread_create(&thread_live_consume, NULL, live_consume, NULL);
1038         if (ret != 0) {
1039                 perror("pthread_create");
1040                 goto end;
1041         }
1042
1043 //      pthread_cancel(live_trace_thread);
1044
1045         /* block until metadata is ready */
1046         sem_init(&metadata_available, 0, 0);
1047
1048         //init_lttngtop();
1049
1050 end:
1051         return NULL;
1052 }
1053
1054 int main(int argc, char **argv)
1055 {
1056         int ret;
1057         struct bt_context *bt_ctx = NULL;
1058
1059         ret = parse_options(argc, argv);
1060         if (ret < 0) {
1061                 fprintf(stdout, "Error parsing options.\n\n");
1062                 usage(stdout);
1063                 exit(EXIT_FAILURE);
1064         } else if (ret > 0) {
1065                 exit(EXIT_SUCCESS);
1066         }
1067
1068         if (!opt_input_path) {
1069                 printf("live tracing enabled\n");
1070                 pthread_create(&live_trace_thread, NULL, setup_live_tracing, (void *) NULL);
1071                 sleep(20);
1072                 printf("STOPPING\n");
1073                 lttng_stop_tracing("test");
1074                 printf("DESTROYING\n");
1075                 lttng_destroy_session("test");
1076
1077                 printf("CANCELLING\n");
1078                 pthread_cancel(live_trace_thread);
1079                 goto end;
1080         } else {
1081                 init_lttngtop();
1082
1083                 bt_ctx = bt_context_create();
1084                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1085                 if (ret < 0) {
1086                         fprintf(stderr, "[error] Opening the trace\n");
1087                         goto end;
1088                 }
1089
1090                 ret = check_requirements(bt_ctx);
1091                 if (ret < 0) {
1092                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1093                         goto end;
1094                 }
1095                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1096                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1097
1098                 iter_trace(bt_ctx);
1099
1100                 quit = 1;
1101                 pthread_join(display_thread, NULL);
1102                 pthread_join(timer_thread, NULL);
1103         }
1104
1105 end:
1106         if (bt_ctx)
1107                 bt_context_put(bt_ctx);
1108
1109         return 0;
1110 }