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 static int opt_textdump;
  55 static int opt_child;
  56
  57 int quit = 0;
  58
  59 struct lttngtop *copy;
  60 pthread_t display_thread;
  61 pthread_t timer_thread;
  62
  63 unsigned long refresh_display = 1 * NSEC_PER_SEC;
  64 unsigned long last_display_update = 0;
  65
  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 int reload_trace = 0;
  75
  76 int last_textdump_print_newline = 1;
  77
  78 enum {
  79         OPT_NONE = 0,
  80         OPT_HELP,
  81         OPT_TEXTDUMP,
  82         OPT_PID,
  83         OPT_CHILD,
  84 };
  85
  86 static struct poptOption long_options[] = {
  87         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  88         { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
  89         { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
  90         { "child", 'f', POPT_ARG_NONE, NULL, OPT_CHILD, NULL, NULL },
  91         { "pid", 'p', POPT_ARG_STRING, &opt_tid, OPT_PID, NULL, NULL },
  92         { NULL, 0, 0, NULL, 0, NULL, NULL },
  93 };
  94
  95 static void handle_textdump_sigterm(int signal)
  96 {
  97         quit = 1;
  98         lttng_destroy_session("test");
  99 }
 100
 101 void *refresh_thread(void *p)
 102 {
 103         struct mmap_stream *mmap_info;
 104
 105         while (1) {
 106                 if (quit) {
 107                         sem_post(&pause_sem);
 108                         sem_post(&timer);
 109                         sem_post(&end_trace_sem);
 110                         sem_post(&goodtodisplay);
 111                         sem_post(&goodtoupdate);
 112                         pthread_exit(0);
 113                 }
 114                 if (!opt_input_path) {
 115                         bt_list_for_each_entry(mmap_info, &mmap_list.head, list)
 116                                 helper_kernctl_buffer_flush(mmap_info->fd);
 117                 }
 118                 sem_wait(&pause_sem);
 119                 sem_post(&pause_sem);
 120                 sem_post(&timer);
 121                 sleep(refresh_display/NSEC_PER_SEC);
 122         }
 123 }
 124
 125 void *ncurses_display(void *p)
 126 {
 127         unsigned int current_display_index = 0;
 128
 129         sem_wait(&bootstrap);
 130         /*
 131          * Prevent the 1 second delay when we hit ESC
 132          */
 133         ESCDELAY = 0;
 134         init_ncurses();
 135
 136         while (1) {
 137                 sem_wait(&timer);
 138                 sem_wait(&goodtodisplay);
 139                 sem_wait(&pause_sem);
 140
 141                 if (quit) {
 142                         sem_post(&pause_sem);
 143                         sem_post(&timer);
 144                         reset_ncurses();
 145                         pthread_exit(0);
 146                 }
 147
 148                 copy = g_ptr_array_index(copies, current_display_index);
 149                 assert(copy);
 150                 display(current_display_index++);
 151
 152                 sem_post(&goodtoupdate);
 153                 sem_post(&pause_sem);
 154         }
 155 }
 156
 157 /*
 158  * hook on each event to check the timestamp and refresh the display if
 159  * necessary
 160  */
 161 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
 162 {
 163         unsigned long timestamp;
 164         struct tm start;
 165         uint64_t ts_nsec_start;
 166         int pid;
 167         int64_t syscall_ret;
 168         const struct definition *scope;
 169
 170         timestamp = bt_ctf_get_timestamp(call_data);
 171
 172         start = format_timestamp(timestamp);
 173         ts_nsec_start = timestamp % NSEC_PER_SEC;
 174
 175         pid = get_context_pid(call_data);
 176         if (pid == -1ULL && opt_tid) {
 177                 goto error;
 178         }
 179
 180         if (opt_tid && !lookup_tid_list(pid))
 181                 goto end;
 182
 183         if (strcmp(bt_ctf_event_name(call_data), "exit_syscall") == 0) {
 184                 scope = bt_ctf_get_top_level_scope(call_data,
 185                                 BT_EVENT_FIELDS);
 186                 syscall_ret = bt_ctf_get_int64(bt_ctf_get_field(call_data,
 187                                         scope, "_ret"));
 188                 printf("= %ld\n", syscall_ret);
 189                 last_textdump_print_newline = 1;
 190         } else {
 191                 /* we might have lost the exit_syscall event, so need to
 192                  * print the newline in this case */
 193                 if (last_textdump_print_newline == 0)
 194                         printf("\n");
 195                 printf("%02d:%02d:%02d.%09" PRIu64 " %d : %s ", start.tm_hour,
 196                                 start.tm_min, start.tm_sec, ts_nsec_start,
 197                                 pid, bt_ctf_event_name(call_data));
 198                 last_textdump_print_newline = 0;
 199         }
 200
 201 end:
 202         return BT_CB_OK;
 203 error:
 204         return BT_CB_ERROR_STOP;
 205 }
 206
 207 /*
 208  * hook on each event to check the timestamp and refresh the display if
 209  * necessary
 210  */
 211 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
 212 {
 213         unsigned long timestamp;
 214
 215         timestamp = bt_ctf_get_timestamp(call_data);
 216         if (timestamp == -1ULL)
 217                 goto error;
 218
 219         if (last_display_update == 0)
 220                 last_display_update = timestamp;
 221
 222         if (timestamp - last_display_update >= refresh_display) {
 223                 sem_wait(&goodtoupdate);
 224                 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
 225                                         timestamp));
 226                 sem_post(&goodtodisplay);
 227                 sem_post(&bootstrap);
 228                 last_display_update = timestamp;
 229         }
 230         return BT_CB_OK;
 231
 232 error:
 233         fprintf(stderr, "check_timestamp callback error\n");
 234         return BT_CB_ERROR_STOP;
 235 }
 236
 237 /*
 238  * get_perf_counter : get or create and return a perf_counter struct for
 239  * either a process or a cpu (only one of the 2 parameters mandatory)
 240  */
 241 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
 242                 struct cputime *cpu)
 243 {
 244         struct perfcounter *ret;
 245         GHashTable *table;
 246
 247         if (proc)
 248                 table = proc->perf;
 249         else if (cpu)
 250                 table = cpu->perf;
 251         else
 252                 goto error;
 253
 254         ret = g_hash_table_lookup(table, (gpointer) name);
 255         if (ret)
 256                 goto end;
 257
 258         ret = g_new0(struct perfcounter, 1);
 259         /* by default, make it visible in the UI */
 260         ret->visible = 1;
 261         g_hash_table_insert(table, (gpointer) strdup(name), ret);
 262
 263 end:
 264         return ret;
 265
 266 error:
 267         return NULL;
 268 }
 269
 270 void update_perf_value(struct processtop *proc, struct cputime *cpu,
 271                 const char *name, int value)
 272 {
 273         struct perfcounter *cpu_perf, *process_perf;
 274
 275         cpu_perf = get_perf_counter(name, NULL, cpu);
 276         if (cpu_perf->count < value) {
 277                 process_perf = get_perf_counter(name, proc, NULL);
 278                 process_perf->count += value - cpu_perf->count;
 279                 cpu_perf->count = value;
 280         }
 281 }
 282
 283 void extract_perf_counter_scope(const struct bt_ctf_event *event,
 284                 const struct bt_definition *scope,
 285                 struct processtop *proc,
 286                 struct cputime *cpu)
 287 {
 288         struct bt_definition const * const *list = NULL;
 289         const struct bt_definition *field;
 290         unsigned int count;
 291         struct perfcounter *perfcounter;
 292         GHashTableIter iter;
 293         gpointer key;
 294         int ret;
 295
 296         if (!scope)
 297                 goto end;
 298
 299         ret = bt_ctf_get_field_list(event, scope, &list, &count);
 300         if (ret < 0)
 301                 goto end;
 302
 303         if (count == 0)
 304                 goto end;
 305
 306         g_hash_table_iter_init(&iter, global_perf_liszt);
 307         while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
 308                 field = bt_ctf_get_field(event, scope, (char *) key);
 309                 if (field) {
 310                         int value = bt_ctf_get_uint64(field);
 311                         if (bt_ctf_field_get_error())
 312                                 continue;
 313                         update_perf_value(proc, cpu, (char *) key, value);
 314                 }
 315         }
 316
 317 end:
 318         return;
 319 }
 320
 321 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
 322 {
 323         struct cputime *cpu;
 324         const struct bt_definition *scope;
 325
 326         cpu = get_cpu(get_cpu_id(event));
 327
 328         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
 329         extract_perf_counter_scope(event, scope, proc, cpu);
 330
 331         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
 332         extract_perf_counter_scope(event, scope, proc, cpu);
 333
 334         scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
 335         extract_perf_counter_scope(event, scope, proc, cpu);
 336 }
 337
 338 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
 339                 void *private_data)
 340 {
 341         int pid, tid, ppid, vpid, vtid, vppid;
 342         char *comm;
 343         struct processtop *parent, *child;
 344         unsigned long timestamp;
 345
 346         timestamp = bt_ctf_get_timestamp(call_data);
 347         if (timestamp == -1ULL)
 348                 goto error;
 349
 350         pid = get_context_pid(call_data);
 351         if (pid == -1ULL) {
 352                 goto error;
 353         }
 354
 355         tid = get_context_tid(call_data);
 356         if (tid == -1ULL) {
 357                 goto error;
 358         }
 359         ppid = get_context_ppid(call_data);
 360         if (ppid == -1ULL) {
 361                 goto error;
 362         }
 363         vpid = get_context_vpid(call_data);
 364         if (pid == -1ULL) {
 365                 vpid = -1;
 366         }
 367         vtid = get_context_vtid(call_data);
 368         if (tid == -1ULL) {
 369                 vtid = -1;
 370         }
 371         vppid = get_context_vppid(call_data);
 372         if (ppid == -1ULL) {
 373                 vppid = -1;
 374         }
 375         comm = get_context_comm(call_data);
 376         if (!comm) {
 377                 goto error;
 378         }
 379
 380         /* find or create the current process */
 381         child = find_process_tid(&lttngtop, tid, comm);
 382         if (!child)
 383                 child = add_proc(&lttngtop, tid, comm, timestamp);
 384         if (!child)
 385                 goto end;
 386         update_proc(child, pid, tid, ppid, vpid, vtid, vppid, comm);
 387
 388         if (pid != tid) {
 389                 /* find or create the parent */
 390                 parent = find_process_tid(&lttngtop, pid, comm);
 391                 if (!parent) {
 392                         parent = add_proc(&lttngtop, pid, comm, timestamp);
 393                         if (parent)
 394                                 parent->pid = pid;
 395                 }
 396
 397                 /* attach the parent to the current process */
 398                 child->threadparent = parent;
 399                 add_thread(parent, child);
 400         }
 401
 402         update_perf_counter(child, call_data);
 403
 404 end:
 405         return BT_CB_OK;
 406
 407 error:
 408         return BT_CB_ERROR_STOP;
 409 }
 410
 411 void init_lttngtop()
 412 {
 413         copies = g_ptr_array_new();
 414         global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
 415
 416         sem_init(&goodtodisplay, 0, 0);
 417         sem_init(&goodtoupdate, 0, 1);
 418         sem_init(&timer, 0, 1);
 419         sem_init(&bootstrap, 0, 0);
 420         sem_init(&pause_sem, 0, 1);
 421         sem_init(&end_trace_sem, 0, 0);
 422
 423         reset_global_counters();
 424         lttngtop.nbproc = 0;
 425         lttngtop.nbthreads = 0;
 426         lttngtop.nbfiles = 0;
 427
 428         lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
 429                         g_direct_equal);
 430         lttngtop.process_table = g_ptr_array_new();
 431         lttngtop.files_table = g_ptr_array_new();
 432         lttngtop.cpu_table = g_ptr_array_new();
 433 }
 434
 435 void usage(FILE *fp)
 436 {
 437         fprintf(fp, "LTTngTop %s\n\n", VERSION);
 438         fprintf(fp, "Usage : lttngtop /path/to/trace\n");
 439 }
 440
 441 /*
 442  * Return 0 if caller should continue, < 0 if caller should return
 443  * error, > 0 if caller should exit without reporting error.
 444  */
 445 static int parse_options(int argc, char **argv)
 446 {
 447         poptContext pc;
 448         int opt, ret = 0;
 449         char *tmp_str;
 450         int *tid;
 451
 452         pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
 453         poptReadDefaultConfig(pc, 0);
 454
 455         while ((opt = poptGetNextOpt(pc)) != -1) {
 456                 switch (opt) {
 457                         case OPT_HELP:
 458                                 usage(stdout);
 459                                 ret = 1;    /* exit cleanly */
 460                                 goto end;
 461                         case OPT_TEXTDUMP:
 462                                 opt_textdump = 1;
 463                                 break;
 464                         case OPT_CHILD:
 465                                 opt_textdump = 1;
 466                                 opt_child = 1;
 467                                 break;
 468                         case OPT_PID:
 469                                 tid_list = g_hash_table_new(g_str_hash, g_str_equal);
 470                                 tmp_str = strtok(opt_tid, ",");
 471                                 while (tmp_str) {
 472                                         tid = malloc(sizeof(int));
 473                                         *tid = atoi(tmp_str);
 474                                         g_hash_table_insert(tid_list, (gpointer) tid, tid);
 475                                         tmp_str = strtok(NULL, ",");
 476                                 }
 477                                 break;
 478                         default:
 479                                 ret = -EINVAL;
 480                                 goto end;
 481                 }
 482         }
 483
 484         opt_input_path = poptGetArg(pc);
 485
 486 end:
 487         if (pc) {
 488                 poptFreeContext(pc);
 489         }
 490         return ret;
 491 }
 492
 493 void iter_trace(struct bt_context *bt_ctx)
 494 {
 495         struct bt_ctf_iter *iter;
 496         struct bt_iter_pos begin_pos;
 497         const struct bt_ctf_event *event;
 498         int ret = 0;
 499
 500         begin_pos.type = BT_SEEK_BEGIN;
 501         iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
 502
 503         if (opt_textdump) {
 504                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 505                                 print_timestamp,
 506                                 NULL, NULL, NULL);
 507         } else {
 508                 /* at each event check if we need to refresh */
 509                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 510                                 check_timestamp,
 511                                 NULL, NULL, NULL);
 512                 /* at each event, verify the status of the process table */
 513                 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
 514                                 fix_process_table,
 515                                 NULL, NULL, NULL);
 516                 /* to handle the scheduling events */
 517                 bt_ctf_iter_add_callback(iter,
 518                                 g_quark_from_static_string("sched_switch"),
 519                                 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
 520                 /* to clean up the process table */
 521                 bt_ctf_iter_add_callback(iter,
 522                                 g_quark_from_static_string("sched_process_free"),
 523                                 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
 524                 /* to get all the process from the statedumps */
 525                 bt_ctf_iter_add_callback(iter,
 526                                 g_quark_from_static_string(
 527                                         "lttng_statedump_process_state"),
 528                                 NULL, 0, handle_statedump_process_state,
 529                                 NULL, NULL, NULL);
 530
 531                 /* for IO top */
 532                 bt_ctf_iter_add_callback(iter,
 533                                 g_quark_from_static_string("exit_syscall"),
 534                                 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
 535                 bt_ctf_iter_add_callback(iter,
 536                                 g_quark_from_static_string("sys_write"),
 537                                 NULL, 0, handle_sys_write, NULL, NULL, NULL);
 538                 bt_ctf_iter_add_callback(iter,
 539                                 g_quark_from_static_string("sys_read"),
 540                                 NULL, 0, handle_sys_read, NULL, NULL, NULL);
 541                 bt_ctf_iter_add_callback(iter,
 542                                 g_quark_from_static_string("sys_open"),
 543                                 NULL, 0, handle_sys_open, NULL, NULL, NULL);
 544                 bt_ctf_iter_add_callback(iter,
 545                                 g_quark_from_static_string("sys_close"),
 546                                 NULL, 0, handle_sys_close, NULL, NULL, NULL);
 547                 bt_ctf_iter_add_callback(iter,
 548                                 g_quark_from_static_string(
 549                                         "lttng_statedump_file_descriptor"),
 550                                 NULL, 0, handle_statedump_file_descriptor,
 551                                 NULL, NULL, NULL);
 552         }
 553
 554         while ((event = bt_ctf_iter_read_event(iter, NULL)) != NULL) {
 555                 if (quit || reload_trace)
 556                         goto end_iter;
 557                 ret = bt_iter_next(bt_ctf_get_iter(iter));
 558                 if (ret < 0)
 559                         goto end_iter;
 560         }
 561
 562         /* block until quit, we reached the end of the trace */
 563         sem_wait(&end_trace_sem);
 564
 565 end_iter:
 566         bt_ctf_iter_destroy(iter);
 567 }
 568
 569 /*
 570  * bt_context_add_traces_recursive: Open a trace recursively
 571  * (copied from BSD code in converter/babeltrace.c)
 572  *
 573  * Find each trace present in the subdirectory starting from the given
 574  * path, and add them to the context. The packet_seek parameter can be
 575  * NULL: this specify to use the default format packet_seek.
 576  *
 577  * Return: 0 on success, nonzero on failure.
 578  * Unable to open toplevel: failure.
 579  * Unable to open some subdirectory or file: warn and continue;
 580  */
 581 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
 582                 const char *format_str,
 583                 void (*packet_seek)(struct bt_stream_pos *pos,
 584                         size_t offset, int whence))
 585 {
 586         FTS *tree;
 587         FTSENT *node;
 588         GArray *trace_ids;
 589         char lpath[PATH_MAX];
 590         char * const paths[2] = { lpath, NULL };
 591         int ret = -1;
 592
 593         /*
 594          * Need to copy path, because fts_open can change it.
 595          * It is the pointer array, not the strings, that are constant.
 596          */
 597         strncpy(lpath, path, PATH_MAX);
 598         lpath[PATH_MAX - 1] = '\0';
 599
 600         tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
 601         if (tree == NULL) {
 602                 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
 603                                 path);
 604                 return -EINVAL;
 605         }
 606
 607         trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
 608
 609         while ((node = fts_read(tree))) {
 610                 int dirfd, metafd;
 611
 612                 if (!(node->fts_info & FTS_D))
 613                         continue;
 614
 615                 dirfd = open(node->fts_accpath, 0);
 616                 if (dirfd < 0) {
 617                         fprintf(stderr, "[error] [Context] Unable to open trace "
 618                                 "directory file descriptor.\n");
 619                         ret = dirfd;
 620                         goto error;
 621                 }
 622                 metafd = openat(dirfd, "metadata", O_RDONLY);
 623                 if (metafd < 0) {
 624                         close(dirfd);
 625                         ret = -1;
 626                         continue;
 627                 } else {
 628                         int trace_id;
 629
 630                         ret = close(metafd);
 631                         if (ret < 0) {
 632                                 perror("close");
 633                                 goto error;
 634                         }
 635                         ret = close(dirfd);
 636                         if (ret < 0) {
 637                                 perror("close");
 638                                 goto error;
 639                         }
 640
 641                         trace_id = bt_context_add_trace(ctx,
 642                                 node->fts_accpath, format_str,
 643                                 packet_seek, NULL, NULL);
 644                         if (trace_id < 0) {
 645                                 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
 646                                         "for reading.\n", node->fts_accpath, path);
 647                                 /* Allow to skip erroneous traces. */
 648                                 continue;
 649                         }
 650                         g_array_append_val(trace_ids, trace_id);
 651                 }
 652         }
 653
 654         g_array_free(trace_ids, TRUE);
 655         return ret;
 656
 657 error:
 658         return ret;
 659 }
 660
 661 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
 662                 int field_cnt, int *tid_check, int *pid_check,
 663                 int *procname_check, int *ppid_check)
 664 {
 665         int j;
 666         struct perfcounter *global;
 667         const char *name;
 668
 669         for (j = 0; j < field_cnt; j++) {
 670                 name = bt_ctf_get_decl_field_name(field_list[j]);
 671                 if (*tid_check == 0) {
 672                         if (strncmp(name, "tid", 3) == 0)
 673                                 (*tid_check)++;
 674                 }
 675                 if (*pid_check == 0) {
 676                         if (strncmp(name, "pid", 3) == 0)
 677                                 (*pid_check)++;
 678                 }
 679                 if (*ppid_check == 0) {
 680                         if (strncmp(name, "ppid", 4) == 0)
 681                                 (*ppid_check)++;
 682                 }
 683                 if (*procname_check == 0) {
 684                         if (strncmp(name, "procname", 8) == 0)
 685                                 (*procname_check)++;
 686                 }
 687                 if (strncmp(name, "perf_", 5) == 0) {
 688                         global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
 689                         if (!global) {
 690                                 global = g_new0(struct perfcounter, 1);
 691                                 /* by default, sort on the first perf context */
 692                                 if (g_hash_table_size(global_perf_liszt) == 0)
 693                                         global->sort = 1;
 694                                 global->visible = 1;
 695                                 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
 696                         }
 697                 }
 698         }
 699
 700         if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
 701                         *procname_check == 1)
 702                 return 0;
 703
 704         return -1;
 705 }
 706
 707 /*
 708  * check_requirements: check if the required context informations are available
 709  *
 710  * If each mandatory context information is available for at least in one
 711  * event, return 0 otherwise return -1.
 712  */
 713 int check_requirements(struct bt_context *ctx)
 714 {
 715         unsigned int i, evt_cnt, field_cnt;
 716         struct bt_ctf_event_decl *const * evt_list;
 717         const struct bt_ctf_field_decl *const * field_list;
 718         int tid_check = 0;
 719         int pid_check = 0;
 720         int procname_check = 0;
 721         int ppid_check = 0;
 722         int ret = 0;
 723
 724         bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
 725         for (i = 0; i < evt_cnt; i++) {
 726                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
 727                                 &field_list, &field_cnt);
 728                 ret = check_field_requirements(field_list, field_cnt,
 729                                 &tid_check, &pid_check, &procname_check,
 730                                 &ppid_check);
 731
 732                 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
 733                                 &field_list, &field_cnt);
 734                 ret = check_field_requirements(field_list, field_cnt,
 735                                 &tid_check, &pid_check, &procname_check,
 736                                 &ppid_check);
 737
 738                 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
 739                                 &field_list, &field_cnt);
 740                 ret = check_field_requirements(field_list, field_cnt,
 741                                 &tid_check, &pid_check, &procname_check,
 742                                 &ppid_check);
 743         }
 744
 745         if (tid_check == 0) {
 746                 ret = -1;
 747                 fprintf(stderr, "[error] missing tid context information\n");
 748         }
 749         if (pid_check == 0) {
 750                 ret = -1;
 751                 fprintf(stderr, "[error] missing pid context information\n");
 752         }
 753         if (ppid_check == 0) {
 754                 ret = -1;
 755                 fprintf(stderr, "[error] missing ppid context information\n");
 756         }
 757         if (procname_check == 0) {
 758                 ret = -1;
 759                 fprintf(stderr, "[error] missing procname context information\n");
 760         }
 761
 762         return ret;
 763 }
 764
 765 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
 766                 struct lttng_consumer_local_data *ctx)
 767 {
 768         unsigned long len;
 769         int err;
 770         long ret = 0;
 771         int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 772
 773         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
 774                 /* Get the next subbuffer */
 775                 err = helper_kernctl_get_next_subbuf(infd);
 776                 if (err != 0) {
 777                         ret = errno;
 778                         perror("Reserving sub buffer failed (everything is normal, "
 779                                         "it is due to concurrency)");
 780                         goto end;
 781                 }
 782                 /* read the whole subbuffer */
 783                 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
 784                 if (err != 0) {
 785                         ret = errno;
 786                         perror("Getting sub-buffer len failed.");
 787                         goto end;
 788                 }
 789
 790                 /* splice the subbuffer to the tracefile */
 791                 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
 792                 if (ret < 0) {
 793                         /*
 794                          * display the error but continue processing to try
 795                          * to release the subbuffer
 796                          */
 797                         fprintf(stderr,"Error splicing to tracefile\n");
 798                 }
 799                 err = helper_kernctl_put_next_subbuf(infd);
 800                 if (err != 0) {
 801                         ret = errno;
 802                         perror("Reserving sub buffer failed (everything is normal, "
 803                                         "it is due to concurrency)");
 804                         goto end;
 805                 }
 806                 sem_post(&metadata_available);
 807         }
 808
 809 end:
 810         return 0;
 811 }
 812
 813 int on_update_fd(int key, uint32_t state)
 814 {
 815         /* let the lib handle the metadata FD */
 816         if (key == sessiond_metadata)
 817                 return 0;
 818         return 1;
 819 }
 820
 821 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
 822 {
 823         int ret;
 824         struct mmap_stream *new_mmap_stream;
 825
 826         /* Opening the tracefile in write mode */
 827         if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
 828                 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
 829                                 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
 830                 if (ret < 0) {
 831                         perror("open");
 832                         goto end;
 833                 }
 834                 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
 835         }
 836
 837         if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
 838                 new_mmap_stream = malloc(sizeof(struct mmap_stream));
 839                 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
 840                                 kconsumerd_fd);
 841                 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
 842
 843                 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
 844                 /* keep mmap FDs internally */
 845                 ret = 1;
 846         } else {
 847                 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
 848                 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
 849                 ret = 0;
 850         }
 851
 852         reload_trace = 1;
 853
 854 end:
 855         return ret;
 856 }
 857
 858 void live_consume(struct bt_context **bt_ctx)
 859 {
 860         int ret;
 861         FILE *metadata_fp;
 862
 863         sem_wait(&metadata_available);
 864         if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
 865                 fprintf(stderr,"no metadata\n");
 866                 goto end;
 867         }
 868         metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
 869
 870         *bt_ctx = bt_context_create();
 871         ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
 872                         lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
 873         if (ret < 0) {
 874                 printf("Error adding trace\n");
 875                 goto end;
 876         }
 877
 878 end:
 879         return;
 880 }
 881
 882 int setup_consumer(char *command_sock_path, pthread_t *threads,
 883                 struct lttng_consumer_local_data *ctx)
 884 {
 885         int ret = 0;
 886
 887         ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
 888                 read_subbuffer, NULL, on_recv_fd, on_update_fd);
 889         if (!ctx)
 890                 goto end;
 891
 892         unlink(command_sock_path);
 893         helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
 894         helper_lttng_consumer_init();
 895
 896         /* Create the thread to manage the receive of fd */
 897         ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
 898                         (void *) ctx);
 899         if (ret != 0) {
 900                 perror("pthread_create receive fd");
 901                 goto end;
 902         }
 903         /* Create thread to manage the polling/writing of traces */
 904         ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
 905                         (void *) ctx);
 906         if (ret != 0) {
 907                 perror("pthread_create poll fd");
 908                 goto end;
 909         }
 910
 911 end:
 912         return ret;
 913 }
 914
 915 int setup_live_tracing()
 916 {
 917         struct lttng_domain dom;
 918         struct lttng_channel chan;
 919         char *channel_name = "mmapchan";
 920         struct lttng_event ev;
 921         int ret = 0;
 922         char *command_sock_path = "/tmp/consumerd_sock";
 923         static pthread_t threads[2]; /* recv_fd, poll */
 924         struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
 925
 926         struct lttng_handle *handle;
 927
 928         BT_INIT_LIST_HEAD(&mmap_list.head);
 929
 930         lttng_consumer_stream_array = g_ptr_array_new();
 931
 932         if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
 933                 fprintf(stderr,"error setting up consumer\n");
 934                 goto error;
 935         }
 936
 937         available_snapshots = g_ptr_array_new();
 938
 939         /* setup the session */
 940         dom.type = LTTNG_DOMAIN_KERNEL;
 941
 942         ret = unlink("/tmp/livesession");
 943
 944         lttng_destroy_session("test");
 945         if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
 946                 fprintf(stderr,"error creating the session : %s\n",
 947                                 helper_lttcomm_get_readable_code(ret));
 948                 goto error;
 949         }
 950
 951         if ((handle = lttng_create_handle("test", &dom)) == NULL) {
 952                 fprintf(stderr,"error creating handle\n");
 953                 goto error_session;
 954         }
 955
 956         /*
 957          * FIXME : need to let the
 958          * helper_lttng_consumer_thread_receive_fds create the
 959          * socket.
 960          * Cleaner solution ?
 961          */
 962         while (access(command_sock_path, F_OK)) {
 963                 sleep(0.1);
 964         }
 965
 966         if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
 967                 fprintf(stderr,"error registering consumer : %s\n",
 968                                 helper_lttcomm_get_readable_code(ret));
 969                 goto error_session;
 970         }
 971
 972         strcpy(chan.name, channel_name);
 973         chan.attr.overwrite = 0;
 974         if (opt_tid && opt_textdump) {
 975                 chan.attr.subbuf_size = 32768;
 976                 chan.attr.num_subbuf = 8;
 977         } else {
 978                 chan.attr.subbuf_size = 1048576; /* 1MB */
 979                 chan.attr.num_subbuf = 4;
 980         }
 981         chan.attr.switch_timer_interval = 0;
 982         chan.attr.read_timer_interval = 200;
 983         chan.attr.output = LTTNG_EVENT_MMAP;
 984
 985         if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
 986                 fprintf(stderr,"error creating channel : %s\n",
 987                                 helper_lttcomm_get_readable_code(ret));
 988                 goto error_session;
 989         }
 990
 991         memset(&ev, '\0', sizeof(struct lttng_event));
 992         //sprintf(ev.name, "sched_switch");
 993         ev.type = LTTNG_EVENT_TRACEPOINT;
 994         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
 995                 fprintf(stderr,"error enabling event : %s\n",
 996                                 helper_lttcomm_get_readable_code(ret));
 997                 goto error_session;
 998         }
 999
1000         ev.type = LTTNG_EVENT_SYSCALL;
1001         if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1002                 fprintf(stderr,"error enabling syscalls : %s\n",
1003                                 helper_lttcomm_get_readable_code(ret));
1004                 goto error_session;
1005         }
1006
1007         kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
1008         lttng_add_context(handle, &kctxpid, NULL, NULL);
1009         kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
1010         lttng_add_context(handle, &kctxtid, NULL, NULL);
1011         kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
1012         lttng_add_context(handle, &kctxppid, NULL, NULL);
1013         kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
1014         lttng_add_context(handle, &kctxcomm, NULL, NULL);
1015         kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
1016         lttng_add_context(handle, &kctxpid, NULL, NULL);
1017         kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
1018         lttng_add_context(handle, &kctxtid, NULL, NULL);
1019
1020         if ((ret = lttng_start_tracing("test")) < 0) {
1021                 fprintf(stderr,"error starting tracing : %s\n",
1022                                 helper_lttcomm_get_readable_code(ret));
1023                 goto error_session;
1024         }
1025
1026         helper_kernctl_buffer_flush(consumerd_metadata);
1027
1028         /* block until metadata is ready */
1029         sem_init(&metadata_available, 0, 0);
1030
1031         return 0;
1032
1033 error_session:
1034         lttng_destroy_session("test");
1035 error:
1036         return -1;
1037 }
1038
1039 int main(int argc, char **argv)
1040 {
1041         int ret;
1042         struct bt_context *bt_ctx = NULL;
1043         struct mmap_stream *mmap_info;
1044         unsigned long mmap_len;
1045
1046         ret = parse_options(argc, argv);
1047         if (ret < 0) {
1048                 fprintf(stdout, "Error parsing options.\n\n");
1049                 usage(stdout);
1050                 exit(EXIT_FAILURE);
1051         } else if (ret > 0) {
1052                 exit(EXIT_SUCCESS);
1053         }
1054
1055         if (!opt_input_path) {
1056                 if (opt_textdump) {
1057                         signal(SIGTERM, handle_textdump_sigterm);
1058                         signal(SIGINT, handle_textdump_sigterm);
1059                 }
1060                 ret = setup_live_tracing();
1061                 if (ret < 0) {
1062                         goto end;
1063                 }
1064                 init_lttngtop();
1065                 if (!opt_textdump) {
1066                         pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1067                         pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1068                 }
1069                 while (!quit) {
1070                         reload_trace = 0;
1071                         live_consume(&bt_ctx);
1072                         iter_trace(bt_ctx);
1073                         ret = bt_context_remove_trace(bt_ctx, 0);
1074                         if (ret != 0)
1075                                 fprintf(stderr, "error removing trace\n");
1076                         if (bt_ctx) {
1077                                 bt_context_put(bt_ctx);
1078                         }
1079
1080                         /*
1081                          * since we receive all FDs every time there is an
1082                          * update and the FD number is different every time,
1083                          * we don't know which one are valid.
1084                          * so we check if all FDs are usable with a simple
1085                          * ioctl call.
1086                          */
1087                         bt_list_for_each_entry(mmap_info, &mmap_list.head, list) {
1088                                 ret = helper_kernctl_get_mmap_len(mmap_info->fd, &mmap_len);
1089                                 if (ret != 0) {
1090                                         bt_list_del(&mmap_info->list);
1091                                 }
1092                         }
1093                         sem_post(&metadata_available);
1094                 }
1095
1096                 pthread_join(timer_thread, NULL);
1097                 quit = 1;
1098                 pthread_join(display_thread, NULL);
1099
1100                 lttng_stop_tracing("test");
1101                 lttng_destroy_session("test");
1102
1103                 goto end;
1104         } else {
1105                 init_lttngtop();
1106
1107                 bt_ctx = bt_context_create();
1108                 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1109                 if (ret < 0) {
1110                         fprintf(stderr, "[error] Opening the trace\n");
1111                         goto end;
1112                 }
1113
1114                 ret = check_requirements(bt_ctx);
1115                 if (ret < 0) {
1116                         fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1117                         goto end;
1118                 }
1119                 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1120                 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1121
1122                 iter_trace(bt_ctx);
1123
1124                 pthread_join(display_thread, NULL);
1125                 quit = 1;
1126                 pthread_join(timer_thread, NULL);
1127         }
1128
1129 end:
1130         if (bt_ctx)
1131                 bt_context_put(bt_ctx);
1132
1133         return 0;
1134 }