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