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