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