trunk/lttv/ltt/tracefile.c

   1 /* This file is part of the Linux Trace Toolkit viewer
   2  * Copyright (C) 2005 Mathieu Desnoyers
   3  *
   4  * Complete rewrite from the original version made by XangXiu Yang.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License Version 2.1 as published by the Free Software Foundation.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #include <stdio.h>
  26 #include <fcntl.h>
  27 #include <string.h>
  28 #include <dirent.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <errno.h>
  32 #include <unistd.h>
  33 #include <math.h>
  34 #include <glib.h>
  35 #include <malloc.h>
  36 #include <sys/mman.h>
  37 #include <string.h>
  38
  39 // For realpath
  40 #include <limits.h>
  41 #include <stdlib.h>
  42
  43
  44 #include <ltt/ltt.h>
  45 #include "ltt-private.h"
  46 #include <ltt/trace.h>
  47 #include <ltt/event.h>
  48 #include <ltt/ltt-types.h>
  49 #include <ltt/marker.h>
  50
  51 /* Tracefile names used in this file */
  52
  53 GQuark LTT_TRACEFILE_NAME_METADATA;
  54
  55 #ifndef g_open
  56 #define g_open open
  57 #endif
  58
  59
  60 #define __UNUSED__ __attribute__((__unused__))
  61
  62 #define g_info(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, format)
  63
  64 #ifndef g_debug
  65 #define g_debug(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, format)
  66 #endif
  67
  68 #define g_close close
  69
  70 /* Those macros must be called from within a function where page_size is a known
  71  * variable */
  72 #define PAGE_MASK (~(page_size-1))
  73 #define PAGE_ALIGN(addr)  (((addr)+page_size-1)&PAGE_MASK)
  74
  75 LttTrace *father_trace = NULL;
  76
  77 /* set the offset of the fields belonging to the event,
  78    need the information of the archecture */
  79 //void set_fields_offsets(LttTracefile *tf, LttEventType *event_type);
  80 //size_t get_fields_offsets(LttTracefile *tf, LttEventType *event_type, void *data);
  81
  82 #if 0
  83 /* get the size of the field type according to
  84  * The facility size information. */
  85 static inline void preset_field_type_size(LttTracefile *tf,
  86     LttEventType *event_type,
  87     off_t offset_root, off_t offset_parent,
  88     enum field_status *fixed_root, enum field_status *fixed_parent,
  89     LttField *field);
  90 #endif //0
  91
  92 /* map a fixed size or a block information from the file (fd) */
  93 static gint map_block(LttTracefile * tf, guint block_num);
  94
  95 /* calculate nsec per cycles for current block */
  96 #if 0
  97 static guint32 calc_nsecs_per_cycle(LttTracefile * t);
  98 static guint64 cycles_2_ns(LttTracefile *tf, guint64 cycles);
  99 #endif //0
 100
 101 /* go to the next event */
 102 static int ltt_seek_next_event(LttTracefile *tf);
 103
 104 static int open_tracefiles(LttTrace *trace, gchar *root_path,
 105     gchar *relative_path);
 106 static int ltt_process_metadata_tracefile(LttTracefile *tf);
 107 static void ltt_tracefile_time_span_get(LttTracefile *tf,
 108                                         LttTime *start, LttTime *end);
 109 static void group_time_span_get(GQuark name, gpointer data, gpointer user_data);
 110 static gint map_block(LttTracefile * tf, guint block_num);
 111 static void ltt_update_event_size(LttTracefile *tf);
 112
 113 /* Enable event debugging */
 114 static int a_event_debug = 0;
 115
 116 void ltt_event_debug(int state)
 117 {
 118   a_event_debug = state;
 119 }
 120
 121 /* trace can be NULL
 122  *
 123  * Return value : 0 success, 1 bad tracefile
 124  */
 125 static int parse_trace_header(ltt_subbuffer_header_t *header,
 126   LttTracefile *tf, LttTrace *t)
 127 {
 128   if (header->magic_number == LTT_MAGIC_NUMBER)
 129     tf->reverse_bo = 0;
 130   else if(header->magic_number == LTT_REV_MAGIC_NUMBER)
 131     tf->reverse_bo = 1;
 132   else  /* invalid magic number, bad tracefile ! */
 133     return 1;
 134
 135   if(t) {
 136     t->ltt_major_version = header->major_version;
 137     t->ltt_minor_version = header->minor_version;
 138     t->arch_size = header->arch_size;
 139   }
 140   tf->alignment = header->alignment;
 141
 142   /* Get float byte order : might be different from int byte order
 143    * (or is set to 0 if the trace has no float (kernel trace)) */
 144   tf->float_word_order = 0;
 145
 146   switch(header->major_version) {
 147   case 0:
 148   case 1:
 149     g_warning("Unsupported trace version : %hhu.%hhu",
 150           header->major_version, header->minor_version);
 151     return 1;
 152     break;
 153   case 2:
 154     switch(header->minor_version) {
 155     case 1:
 156       {
 157         struct ltt_subbuffer_header_2_1 *vheader = header;
 158         tf->buffer_header_size = ltt_subbuffer_header_size();
 159         tf->tscbits = 27;
 160         tf->eventbits = 5;
 161         tf->tsc_mask = ((1ULL << tf->tscbits) - 1);
 162         tf->tsc_mask_next_bit = (1ULL << tf->tscbits);
 163
 164         if(t) {
 165           t->start_freq = ltt_get_uint64(LTT_GET_BO(tf),
 166                                          &vheader->start_freq);
 167           t->freq_scale = ltt_get_uint32(LTT_GET_BO(tf),
 168                                          &vheader->freq_scale);
 169           if(father_trace) {
 170             t->start_freq = father_trace->start_freq;
 171             t->freq_scale = father_trace->freq_scale;
 172           } else {
 173             father_trace = t;
 174           }
 175           t->start_tsc = ltt_get_uint64(LTT_GET_BO(tf),
 176                                         &vheader->cycle_count_begin);
 177           t->start_monotonic = 0;
 178           t->start_time.tv_sec = ltt_get_uint64(LTT_GET_BO(tf),
 179                                        &vheader->start_time_sec);
 180           t->start_time.tv_nsec = ltt_get_uint64(LTT_GET_BO(tf),
 181                                        &vheader->start_time_usec);
 182           t->start_time.tv_nsec *= 1000; /* microsec to nanosec */
 183
 184           t->start_time_from_tsc = ltt_time_from_uint64(
 185               (double)t->start_tsc
 186               * (1000000000.0 / tf->trace->freq_scale)
 187               / (double)t->start_freq);
 188         }
 189       }
 190       break;
 191     default:
 192       g_warning("Unsupported trace version : %hhu.%hhu",
 193               header->major_version, header->minor_version);
 194       return 1;
 195     }
 196     break;
 197   default:
 198     g_warning("Unsupported trace version : %hhu.%hhu",
 199             header->major_version, header->minor_version);
 200     return 1;
 201   }
 202   return 0;
 203 }
 204
 205
 206
 207 /*****************************************************************************
 208  *Function name
 209  *    ltt_tracefile_open : open a trace file, construct a LttTracefile
 210  *Input params
 211  *    t                  : the trace containing the tracefile
 212  *    fileName           : path name of the trace file
 213  *    tf                 : the tracefile structure
 214  *Return value
 215  *                       : 0 for success, -1 otherwise.
 216  ****************************************************************************/
 217
 218 static gint ltt_tracefile_open(LttTrace *t, gchar * fileName, LttTracefile *tf)
 219 {
 220   struct stat    lTDFStat;    /* Trace data file status */
 221   ltt_subbuffer_header_t *header;
 222   int page_size = getpagesize();
 223
 224   //open the file
 225   tf->long_name = g_quark_from_string(fileName);
 226   tf->trace = t;
 227   tf->fd = open(fileName, O_RDONLY);
 228   if(tf->fd < 0){
 229     g_warning("Unable to open input data file %s\n", fileName);
 230     goto end;
 231   }
 232
 233   // Get the file's status
 234   if(fstat(tf->fd, &lTDFStat) < 0){
 235     g_warning("Unable to get the status of the input data file %s\n", fileName);
 236     goto close_file;
 237   }
 238
 239   // Is the file large enough to contain a trace
 240   if(lTDFStat.st_size <
 241       (off_t)(ltt_subbuffer_header_size())){
 242     g_print("The input data file %s does not contain a trace\n", fileName);
 243     goto close_file;
 244   }
 245
 246   /* Temporarily map the buffer start header to get trace information */
 247   /* Multiple of pages aligned head */
 248   tf->buffer.head = mmap(0,
 249       PAGE_ALIGN(ltt_subbuffer_header_size()), PROT_READ,
 250       MAP_PRIVATE, tf->fd, 0);
 251   if(tf->buffer.head == MAP_FAILED) {
 252     perror("Error in allocating memory for buffer of tracefile");
 253     goto close_file;
 254   }
 255   g_assert( ( (gulong)tf->buffer.head&(8-1) ) == 0); // make sure it's aligned.
 256
 257   header = (ltt_subbuffer_header_t *)tf->buffer.head;
 258
 259   if(parse_trace_header(header, tf, NULL)) {
 260     g_warning("parse_trace_header error");
 261     goto unmap_file;
 262   }
 263
 264   //store the size of the file
 265   tf->file_size = lTDFStat.st_size;
 266   tf->buf_size = ltt_get_uint32(LTT_GET_BO(tf), &header->buf_size);
 267   tf->num_blocks = tf->file_size / tf->buf_size;
 268
 269   if(munmap(tf->buffer.head,
 270         PAGE_ALIGN(ltt_subbuffer_header_size()))) {
 271     g_warning("unmap size : %u\n",
 272         PAGE_ALIGN(ltt_subbuffer_header_size()));
 273     perror("munmap error");
 274     g_assert(0);
 275   }
 276   tf->buffer.head = NULL;
 277
 278   //read the first block
 279   if(map_block(tf,0)) {
 280     perror("Cannot map block for tracefile");
 281     goto close_file;
 282   }
 283
 284   return 0;
 285
 286   /* Error */
 287 unmap_file:
 288   if(munmap(tf->buffer.head,
 289         PAGE_ALIGN(ltt_subbuffer_header_size()))) {
 290     g_warning("unmap size : %u\n",
 291         PAGE_ALIGN(ltt_subbuffer_header_size()));
 292     perror("munmap error");
 293     g_assert(0);
 294   }
 295 close_file:
 296   close(tf->fd);
 297 end:
 298   return -1;
 299 }
 300
 301
 302 /*****************************************************************************
 303  *Function name
 304  *    ltt_tracefile_close: close a trace file,
 305  *Input params
 306  *    t                  : tracefile which will be closed
 307  ****************************************************************************/
 308
 309 static void ltt_tracefile_close(LttTracefile *t)
 310 {
 311   int page_size = getpagesize();
 312
 313   if(t->buffer.head != NULL)
 314     if(munmap(t->buffer.head, PAGE_ALIGN(t->buf_size))) {
 315     g_warning("unmap size : %u\n",
 316         PAGE_ALIGN(t->buf_size));
 317     perror("munmap error");
 318     g_assert(0);
 319   }
 320
 321   close(t->fd);
 322 }
 323
 324 /****************************************************************************
 325  * get_absolute_pathname
 326  *
 327  * return the unique pathname in the system
 328  *
 329  * MD : Fixed this function so it uses realpath, dealing well with
 330  * forgotten cases (.. were not used correctly before).
 331  *
 332  ****************************************************************************/
 333 void get_absolute_pathname(const gchar *pathname, gchar * abs_pathname)
 334 {
 335   abs_pathname[0] = '\0';
 336
 337   if (realpath(pathname, abs_pathname) != NULL)
 338     return;
 339   else
 340   {
 341     /* error, return the original path unmodified */
 342     strcpy(abs_pathname, pathname);
 343     return;
 344   }
 345   return;
 346 }
 347
 348 /* Search for something like : .*_.*
 349  *
 350  * The left side is the name, the right side is the number.
 351  */
 352
 353 static int get_tracefile_name_number(gchar *raw_name,
 354                               GQuark *name,
 355                               guint *num,
 356                               gulong *tid,
 357                               gulong *pgid,
 358                               guint64 *creation)
 359 {
 360   guint raw_name_len = strlen(raw_name);
 361   gchar char_name[PATH_MAX];
 362   int i;
 363   int underscore_pos;
 364   long int cpu_num;
 365   gchar *endptr;
 366   gchar *tmpptr;
 367
 368   for(i=raw_name_len-1;i>=0;i--) {
 369     if(raw_name[i] == '_') break;
 370   }
 371   if(i==-1) { /* Either not found or name length is 0 */
 372     /* This is a userspace tracefile */
 373     strncpy(char_name, raw_name, raw_name_len);
 374     char_name[raw_name_len] = '\0';
 375     *name = g_quark_from_string(char_name);
 376     *num = 0;  /* unknown cpu */
 377     for(i=0;i<raw_name_len;i++) {
 378       if(raw_name[i] == '/') {
 379         break;
 380       }
 381     }
 382     i++;
 383     for(;i<raw_name_len;i++) {
 384       if(raw_name[i] == '/') {
 385         break;
 386       }
 387     }
 388     i++;
 389     for(;i<raw_name_len;i++) {
 390       if(raw_name[i] == '-') {
 391         break;
 392       }
 393     }
 394     if(i == raw_name_len) return -1;
 395     i++;
 396     tmpptr = &raw_name[i];
 397     for(;i<raw_name_len;i++) {
 398       if(raw_name[i] == '.') {
 399         raw_name[i] = ' ';
 400         break;
 401       }
 402     }
 403     *tid = strtoul(tmpptr, &endptr, 10);
 404     if(endptr == tmpptr)
 405       return -1; /* No digit */
 406     if(*tid == ULONG_MAX)
 407       return -1; /* underflow / overflow */
 408     i++;
 409     tmpptr = &raw_name[i];
 410     for(;i<raw_name_len;i++) {
 411       if(raw_name[i] == '.') {
 412         raw_name[i] = ' ';
 413         break;
 414       }
 415     }
 416     *pgid = strtoul(tmpptr, &endptr, 10);
 417     if(endptr == tmpptr)
 418       return -1; /* No digit */
 419     if(*pgid == ULONG_MAX)
 420       return -1; /* underflow / overflow */
 421     i++;
 422     tmpptr = &raw_name[i];
 423     *creation = strtoull(tmpptr, &endptr, 10);
 424     if(endptr == tmpptr)
 425       return -1; /* No digit */
 426     if(*creation == G_MAXUINT64)
 427       return -1; /* underflow / overflow */
 428   } else {
 429     underscore_pos = i;
 430
 431     cpu_num = strtol(raw_name+underscore_pos+1, &endptr, 10);
 432
 433     if(endptr == raw_name+underscore_pos+1)
 434       return -1; /* No digit */
 435     if(cpu_num == LONG_MIN || cpu_num == LONG_MAX)
 436       return -1; /* underflow / overflow */
 437
 438     strncpy(char_name, raw_name, underscore_pos);
 439     char_name[underscore_pos] = '\0';
 440
 441     *name = g_quark_from_string(char_name);
 442     *num = cpu_num;
 443   }
 444
 445
 446   return 0;
 447 }
 448
 449
 450 GData **ltt_trace_get_tracefiles_groups(LttTrace *trace)
 451 {
 452   return &trace->tracefiles;
 453 }
 454
 455
 456 void compute_tracefile_group(GQuark key_id,
 457                              GArray *group,
 458                              struct compute_tracefile_group_args *args)
 459 {
 460   int i;
 461   LttTracefile *tf;
 462
 463   for(i=0; i<group->len; i++) {
 464     tf = &g_array_index (group, LttTracefile, i);
 465     if(tf->cpu_online)
 466       args->func(tf, args->func_args);
 467   }
 468 }
 469
 470
 471 static void ltt_tracefile_group_destroy(gpointer data)
 472 {
 473   GArray *group = (GArray *)data;
 474   int i;
 475   LttTracefile *tf;
 476
 477   for(i=0; i<group->len; i++) {
 478     tf = &g_array_index (group, LttTracefile, i);
 479     if(tf->cpu_online)
 480       ltt_tracefile_close(tf);
 481   }
 482   g_array_free(group, TRUE);
 483 }
 484
 485 static gboolean ltt_tracefile_group_has_cpu_online(gpointer data)
 486 {
 487   GArray *group = (GArray *)data;
 488   int i;
 489   LttTracefile *tf;
 490
 491   for(i=0; i<group->len; i++) {
 492     tf = &g_array_index (group, LttTracefile, i);
 493     if(tf->cpu_online)
 494       return 1;
 495   }
 496   return 0;
 497 }
 498
 499
 500 /* Open each tracefile under a specific directory. Put them in a
 501  * GData : permits to access them using their tracefile group pathname.
 502  * i.e. access control/modules tracefile group by index :
 503  * "control/module".
 504  *
 505  * relative path is the path relative to the trace root
 506  * root path is the full path
 507  *
 508  * A tracefile group is simply an array where all the per cpu tracefiles sit.
 509  */
 510
 511 static int open_tracefiles(LttTrace *trace, gchar *root_path, gchar *relative_path)
 512 {
 513   DIR *dir = opendir(root_path);
 514   struct dirent *entry;
 515   struct stat stat_buf;
 516   int ret;
 517
 518   gchar path[PATH_MAX];
 519   int path_len;
 520   gchar *path_ptr;
 521
 522   int rel_path_len;
 523   gchar rel_path[PATH_MAX];
 524   gchar *rel_path_ptr;
 525   LttTracefile tmp_tf;
 526
 527   if(dir == NULL) {
 528     perror(root_path);
 529     return ENOENT;
 530   }
 531
 532   strncpy(path, root_path, PATH_MAX-1);
 533   path_len = strlen(path);
 534   path[path_len] = '/';
 535   path_len++;
 536   path_ptr = path + path_len;
 537
 538   strncpy(rel_path, relative_path, PATH_MAX-1);
 539   rel_path_len = strlen(rel_path);
 540   rel_path[rel_path_len] = '/';
 541   rel_path_len++;
 542   rel_path_ptr = rel_path + rel_path_len;
 543
 544   while((entry = readdir(dir)) != NULL) {
 545
 546     if(entry->d_name[0] == '.') continue;
 547
 548     strncpy(path_ptr, entry->d_name, PATH_MAX - path_len);
 549     strncpy(rel_path_ptr, entry->d_name, PATH_MAX - rel_path_len);
 550
 551     ret = stat(path, &stat_buf);
 552     if(ret == -1) {
 553       perror(path);
 554       continue;
 555     }
 556
 557     g_debug("Tracefile file or directory : %s\n", path);
 558
 559   //  if(strcmp(rel_path, "/eventdefs") == 0) continue;
 560
 561     if(S_ISDIR(stat_buf.st_mode)) {
 562
 563       g_debug("Entering subdirectory...\n");
 564       ret = open_tracefiles(trace, path, rel_path);
 565       if(ret < 0) continue;
 566     } else if(S_ISREG(stat_buf.st_mode)) {
 567       GQuark name;
 568       guint num;
 569       gulong tid, pgid;
 570       guint64 creation;
 571       GArray *group;
 572       num = 0;
 573       tid = pgid = 0;
 574       creation = 0;
 575       if(get_tracefile_name_number(rel_path, &name, &num, &tid, &pgid, &creation))
 576         continue; /* invalid name */
 577
 578       g_debug("Opening file.\n");
 579       if(ltt_tracefile_open(trace, path, &tmp_tf)) {
 580         g_info("Error opening tracefile %s", path);
 581
 582         continue; /* error opening the tracefile : bad magic number ? */
 583       }
 584
 585       g_debug("Tracefile name is %s and number is %u",
 586           g_quark_to_string(name), num);
 587
 588       tmp_tf.cpu_online = 1;
 589       tmp_tf.cpu_num = num;
 590       tmp_tf.name = name;
 591       tmp_tf.tid = tid;
 592       tmp_tf.pgid = pgid;
 593       tmp_tf.creation = creation;
 594       group = g_datalist_id_get_data(&trace->tracefiles, name);
 595       if(group == NULL) {
 596         /* Elements are automatically cleared when the array is allocated.
 597          * It makes the cpu_online variable set to 0 : cpu offline, by default.
 598          */
 599         group = g_array_sized_new (FALSE, TRUE, sizeof(LttTracefile), 10);
 600         g_datalist_id_set_data_full(&trace->tracefiles, name,
 601                                  group, ltt_tracefile_group_destroy);
 602       }
 603
 604       /* Add the per cpu tracefile to the named group */
 605       unsigned int old_len = group->len;
 606       if(num+1 > old_len)
 607         group = g_array_set_size(group, num+1);
 608       g_array_index (group, LttTracefile, num) = tmp_tf;
 609       g_array_index (group, LttTracefile, num).event.tracefile =
 610         &g_array_index (group, LttTracefile, num);
 611     }
 612   }
 613
 614   closedir(dir);
 615
 616   return 0;
 617 }
 618
 619
 620 /* Presumes the tracefile is already seeked at the beginning. It makes sense,
 621  * because it must be done just after the opening */
 622 static int ltt_process_metadata_tracefile(LttTracefile *tf)
 623 {
 624   int err;
 625   guint i;
 626
 627   while(1) {
 628     err = ltt_tracefile_read_seek(tf);
 629     if(err == EPERM) goto seek_error;
 630     else if(err == ERANGE) break; /* End of tracefile */
 631
 632     err = ltt_tracefile_read_update_event(tf);
 633     if(err) goto update_error;
 634
 635     /* The rules are :
 636      * It contains only core events :
 637      *  0 : set_marker_id
 638      *  1 : set_marker_format
 639      */
 640     if(tf->event.event_id >= MARKER_CORE_IDS) {
 641       /* Should only contain core events */
 642       g_warning("Error in processing metadata file %s, "
 643           "should not contain event id %u.", g_quark_to_string(tf->name),
 644           tf->event.event_id);
 645       err = EPERM;
 646       goto event_id_error;
 647     } else {
 648       char *pos;
 649       const char *marker_name, *format;
 650       uint16_t id;
 651       guint8 int_size, long_size, pointer_size, size_t_size, alignment;
 652
 653       switch((enum marker_id)tf->event.event_id) {
 654         case MARKER_ID_SET_MARKER_ID:
 655           marker_name = pos = tf->event.data;
 656           g_debug("Doing MARKER_ID_SET_MARKER_ID of marker %s", marker_name);
 657           pos += strlen(marker_name) + 1;
 658           pos += ltt_align((size_t)pos, sizeof(guint16), tf->alignment);
 659           id = ltt_get_uint16(LTT_GET_BO(tf), pos);
 660           g_debug("In MARKER_ID_SET_MARKER_ID of marker %s id %hu",
 661                 marker_name, id);
 662           pos += sizeof(guint16);
 663           int_size = *(guint8*)pos;
 664           pos += sizeof(guint8);
 665           long_size = *(guint8*)pos;
 666           pos += sizeof(guint8);
 667           pointer_size = *(guint8*)pos;
 668           pos += sizeof(guint8);
 669           size_t_size = *(guint8*)pos;
 670           pos += sizeof(guint8);
 671           alignment = *(guint8*)pos;
 672           pos += sizeof(guint8);
 673           marker_id_event(tf->trace, g_quark_from_string(marker_name),
 674                           id, int_size, long_size,
 675                           pointer_size, size_t_size, alignment);
 676           break;
 677         case MARKER_ID_SET_MARKER_FORMAT:
 678           marker_name = pos = tf->event.data;
 679           g_debug("Doing MARKER_ID_SET_MARKER_FORMAT of marker %s",
 680                   marker_name);
 681           pos += strlen(marker_name) + 1;
 682           format = pos;
 683           pos += strlen(format) + 1;
 684           marker_format_event(tf->trace, g_quark_from_string(marker_name),
 685                               format);
 686           /* get information from dictionary TODO */
 687           break;
 688         default:
 689           g_warning("Error in processing metadata file %s, "
 690               "unknown event id %hhu.",
 691               g_quark_to_string(tf->name),
 692               tf->event.event_id);
 693           err = EPERM;
 694           goto event_id_error;
 695       }
 696     }
 697   }
 698   return 0;
 699
 700   /* Error handling */
 701 event_id_error:
 702 update_error:
 703 seek_error:
 704   g_warning("An error occured in metadata tracefile parsing");
 705   return err;
 706 }
 707
 708 /*
 709  * Open a trace and return its LttTrace handle.
 710  *
 711  * pathname must be the directory of the trace
 712  */
 713
 714 LttTrace *ltt_trace_open(const gchar *pathname)
 715 {
 716   gchar abs_path[PATH_MAX];
 717   LttTrace  * t;
 718   LttTracefile *tf;
 719   GArray *group;
 720   int i, ret;
 721   ltt_subbuffer_header_t *header;
 722   DIR *dir;
 723   struct dirent *entry;
 724   guint control_found = 0;
 725   struct stat stat_buf;
 726   gchar path[PATH_MAX];
 727
 728   t = g_new(LttTrace, 1);
 729   if(!t) goto alloc_error;
 730
 731   get_absolute_pathname(pathname, abs_path);
 732   t->pathname = g_quark_from_string(abs_path);
 733
 734   g_datalist_init(&t->tracefiles);
 735
 736   /* Test to see if it looks like a trace */
 737   dir = opendir(abs_path);
 738   if(dir == NULL) {
 739     perror(abs_path);
 740     goto open_error;
 741   }
 742   while((entry = readdir(dir)) != NULL) {
 743     strcpy(path, abs_path);
 744     strcat(path, "/");
 745     strcat(path, entry->d_name);
 746     ret = stat(path, &stat_buf);
 747     if(ret == -1) {
 748       perror(path);
 749       continue;
 750     }
 751     if(S_ISDIR(stat_buf.st_mode)) {
 752       if(strcmp(entry->d_name, "control") == 0) {
 753         control_found = 1;
 754       }
 755     }
 756   }
 757   closedir(dir);
 758
 759   if(!control_found) goto find_error;
 760
 761   /* Open all the tracefiles */
 762   if(open_tracefiles(t, abs_path, "")) {
 763     g_warning("Error opening tracefile %s", abs_path);
 764     goto find_error;
 765   }
 766
 767   /* Parse each trace control/metadata_N files : get runtime fac. info */
 768   group = g_datalist_id_get_data(&t->tracefiles, LTT_TRACEFILE_NAME_METADATA);
 769   if(group == NULL) {
 770     g_error("Trace %s has no metadata tracefile", abs_path);
 771     g_assert(0);
 772     goto metadata_error;
 773   }
 774
 775   /* Get the trace information for the control/metadata_0 tracefile */
 776   g_assert(group->len > 0);
 777   tf = &g_array_index (group, LttTracefile, 0);
 778   header = (ltt_subbuffer_header_t *)tf->buffer.head;
 779   ret = parse_trace_header(header, tf, t);
 780   g_assert(!ret);
 781
 782   t->num_cpu = group->len;
 783
 784   ret = allocate_marker_data(t);
 785   if (ret)
 786     g_error("Error in allocating marker data");
 787
 788   for(i=0; i<group->len; i++) {
 789     tf = &g_array_index (group, LttTracefile, i);
 790     if (tf->cpu_online)
 791       if(ltt_process_metadata_tracefile(tf))
 792         goto metadata_error;
 793   }
 794
 795   return t;
 796
 797   /* Error handling */
 798 metadata_error:
 799   destroy_marker_data(t);
 800 find_error:
 801   g_datalist_clear(&t->tracefiles);
 802 open_error:
 803   g_free(t);
 804 alloc_error:
 805   return NULL;
 806
 807 }
 808
 809 /* Open another, completely independant, instance of a trace.
 810  *
 811  * A read on this new instance will read the first event of the trace.
 812  *
 813  * When we copy a trace, we want all the opening actions to happen again :
 814  * the trace will be reopened and totally independant from the original.
 815  * That's why we call ltt_trace_open.
 816  */
 817 LttTrace *ltt_trace_copy(LttTrace *self)
 818 {
 819   return ltt_trace_open(g_quark_to_string(self->pathname));
 820 }
 821
 822 /*
 823  * Close a trace
 824  */
 825
 826 void ltt_trace_close(LttTrace *t)
 827 {
 828   g_datalist_clear(&t->tracefiles);
 829   g_free(t);
 830 }
 831
 832
 833 /*****************************************************************************
 834  * Get the start time and end time of the trace
 835  ****************************************************************************/
 836
 837 void ltt_tracefile_time_span_get(LttTracefile *tf,
 838                                         LttTime *start, LttTime *end)
 839 {
 840   int err;
 841
 842   err = map_block(tf, 0);
 843   if(unlikely(err)) {
 844     g_error("Can not map block");
 845     *start = ltt_time_infinite;
 846   } else
 847     *start = tf->buffer.begin.timestamp;
 848
 849   err = map_block(tf, tf->num_blocks - 1);  /* Last block */
 850   if(unlikely(err)) {
 851     g_error("Can not map block");
 852     *end = ltt_time_zero;
 853   } else
 854     *end = tf->buffer.end.timestamp;
 855 }
 856
 857 struct tracefile_time_span_get_args {
 858   LttTrace *t;
 859   LttTime *start;
 860   LttTime *end;
 861 };
 862
 863 static void group_time_span_get(GQuark name, gpointer data, gpointer user_data)
 864 {
 865   struct tracefile_time_span_get_args *args =
 866           (struct tracefile_time_span_get_args*)user_data;
 867
 868   GArray *group = (GArray *)data;
 869   int i;
 870   LttTracefile *tf;
 871   LttTime tmp_start;
 872   LttTime tmp_end;
 873
 874   for(i=0; i<group->len; i++) {
 875     tf = &g_array_index (group, LttTracefile, i);
 876     if(tf->cpu_online) {
 877       ltt_tracefile_time_span_get(tf, &tmp_start, &tmp_end);
 878       if(ltt_time_compare(*args->start, tmp_start)>0) *args->start = tmp_start;
 879       if(ltt_time_compare(*args->end, tmp_end)<0) *args->end = tmp_end;
 880     }
 881   }
 882 }
 883
 884 /* return the start and end time of a trace */
 885
 886 void ltt_trace_time_span_get(LttTrace *t, LttTime *start, LttTime *end)
 887 {
 888   LttTime min_start = ltt_time_infinite;
 889   LttTime max_end = ltt_time_zero;
 890   struct tracefile_time_span_get_args args = { t, &min_start, &max_end };
 891
 892   g_datalist_foreach(&t->tracefiles, &group_time_span_get, &args);
 893
 894   if(start != NULL) *start = min_start;
 895   if(end != NULL) *end = max_end;
 896
 897 }
 898
 899
 900 /* Seek to the first event in a tracefile that has a time equal or greater than
 901  * the time passed in parameter.
 902  *
 903  * If the time parameter is outside the tracefile time span, seek to the first
 904  * event or if after, return ERANGE.
 905  *
 906  * If the time parameter is before the first event, we have to seek specially to
 907  * there.
 908  *
 909  * If the time is after the end of the trace, return ERANGE.
 910  *
 911  * Do a binary search to find the right block, then a sequential search in the
 912  * block to find the event.
 913  *
 914  * In the special case where the time requested fits inside a block that has no
 915  * event corresponding to the requested time, the first event of the next block
 916  * will be seeked.
 917  *
 918  * IMPORTANT NOTE : // FIXME everywhere...
 919  *
 920  * You MUST NOT do a ltt_tracefile_read right after a ltt_tracefile_seek_time :
 921  * you will jump over an event if you do.
 922  *
 923  * Return value : 0 : no error, the tf->event can be used
 924  *                ERANGE : time if after the last event of the trace
 925  *                otherwise : this is an error.
 926  *
 927  * */
 928
 929 int ltt_tracefile_seek_time(LttTracefile *tf, LttTime time)
 930 {
 931   int ret = 0;
 932   int err;
 933   unsigned int block_num, high, low;
 934
 935   /* seek at the beginning of trace */
 936   err = map_block(tf, 0);  /* First block */
 937   if(unlikely(err)) {
 938     g_error("Can not map block");
 939     goto fail;
 940   }
 941
 942  /* If the time is lower or equal the beginning of the trace,
 943   * go to the first event. */
 944   if(ltt_time_compare(time, tf->buffer.begin.timestamp) <= 0) {
 945     ret = ltt_tracefile_read(tf);
 946     if(ret == ERANGE) goto range;
 947     else if (ret) goto fail;
 948     goto found; /* There is either no event in the trace or the event points
 949                    to the first event in the trace */
 950   }
 951
 952   err = map_block(tf, tf->num_blocks - 1);  /* Last block */
 953   if(unlikely(err)) {
 954     g_error("Can not map block");
 955     goto fail;
 956   }
 957
 958  /* If the time is after the end of the trace, return ERANGE. */
 959   if(ltt_time_compare(time, tf->buffer.end.timestamp) > 0) {
 960     goto range;
 961   }
 962
 963   /* Binary search the block */
 964   high = tf->num_blocks - 1;
 965   low = 0;
 966
 967   while(1) {
 968     block_num = ((high-low) / 2) + low;
 969
 970     err = map_block(tf, block_num);
 971     if(unlikely(err)) {
 972       g_error("Can not map block");
 973       goto fail;
 974     }
 975     if(high == low) {
 976       /* We cannot divide anymore : this is what would happen if the time
 977        * requested was exactly between two consecutive buffers'end and start
 978        * timestamps. This is also what would happend if we didn't deal with out
 979        * of span cases prior in this function. */
 980       /* The event is right in the buffer!
 981        * (or in the next buffer first event) */
 982       while(1) {
 983         ret = ltt_tracefile_read(tf);
 984         if(ret == ERANGE) goto range; /* ERANGE or EPERM */
 985         else if(ret) goto fail;
 986
 987         if(ltt_time_compare(time, tf->event.event_time) <= 0)
 988           goto found;
 989       }
 990
 991     } else if(ltt_time_compare(time, tf->buffer.begin.timestamp) < 0) {
 992       /* go to lower part */
 993       high = block_num - 1;
 994     } else if(ltt_time_compare(time, tf->buffer.end.timestamp) > 0) {
 995       /* go to higher part */
 996       low = block_num + 1;
 997     } else {/* The event is right in the buffer!
 998                (or in the next buffer first event) */
 999       while(1) {
1000         ret = ltt_tracefile_read(tf);
1001         if(ret == ERANGE) goto range; /* ERANGE or EPERM */
1002         else if(ret) goto fail;
1003
1004         if(ltt_time_compare(time, tf->event.event_time) <= 0)
1005           break;
1006       }
1007       goto found;
1008     }
1009   }
1010
1011 found:
1012   return 0;
1013 range:
1014   return ERANGE;
1015
1016   /* Error handling */
1017 fail:
1018   g_error("ltt_tracefile_seek_time failed on tracefile %s",
1019       g_quark_to_string(tf->name));
1020   return EPERM;
1021 }
1022
1023 /* Seek to a position indicated by an LttEventPosition
1024  */
1025
1026 int ltt_tracefile_seek_position(LttTracefile *tf, const LttEventPosition *ep)
1027 {
1028   int err;
1029
1030   if(ep->tracefile != tf) {
1031     goto fail;
1032   }
1033
1034   err = map_block(tf, ep->block);
1035   if(unlikely(err)) {
1036     g_error("Can not map block");
1037     goto fail;
1038   }
1039
1040   tf->event.offset = ep->offset;
1041
1042   /* Put back the event real tsc */
1043   tf->event.tsc = ep->tsc;
1044   tf->buffer.tsc = ep->tsc;
1045
1046   err = ltt_tracefile_read_update_event(tf);
1047   if(err) goto fail;
1048
1049   /* deactivate this, as it does nothing for now
1050   err = ltt_tracefile_read_op(tf);
1051   if(err) goto fail;
1052   */
1053
1054   return 0;
1055
1056 fail:
1057   g_error("ltt_tracefile_seek_time failed on tracefile %s",
1058       g_quark_to_string(tf->name));
1059   return 1;
1060 }
1061
1062 /* Given a TSC value, return the LttTime (seconds,nanoseconds) it
1063  * corresponds to.
1064  */
1065
1066 LttTime ltt_interpolate_time_from_tsc(LttTracefile *tf, guint64 tsc)
1067 {
1068   LttTime time;
1069
1070   if(tsc > tf->trace->start_tsc) {
1071     time = ltt_time_from_uint64(
1072         (double)(tsc - tf->trace->start_tsc)
1073                                     * (1000000000.0 / tf->trace->freq_scale)
1074                                     / (double)tf->trace->start_freq);
1075     time = ltt_time_add(tf->trace->start_time_from_tsc, time);
1076   } else {
1077     time = ltt_time_from_uint64(
1078         (double)(tf->trace->start_tsc - tsc)
1079                                     * (1000000000.0 / tf->trace->freq_scale)
1080                                     / (double)tf->trace->start_freq);
1081     time = ltt_time_sub(tf->trace->start_time_from_tsc, time);
1082   }
1083   return time;
1084 }
1085
1086 /* Calculate the real event time based on the buffer boundaries */
1087 LttTime ltt_interpolate_time(LttTracefile *tf, LttEvent *event)
1088 {
1089   return ltt_interpolate_time_from_tsc(tf, tf->buffer.tsc);
1090 }
1091
1092
1093 /* Get the current event of the tracefile : valid until the next read */
1094 LttEvent *ltt_tracefile_get_event(LttTracefile *tf)
1095 {
1096   return &tf->event;
1097 }
1098
1099
1100
1101 /*****************************************************************************
1102  *Function name
1103  *    ltt_tracefile_read : Read the next event in the tracefile
1104  *Input params
1105  *    t                  : tracefile
1106  *Return value
1107  *
1108  *    Returns 0 if an event can be used in tf->event.
1109  *    Returns ERANGE on end of trace. The event in tf->event still can be used
1110  *    (if the last block was not empty).
1111  *    Returns EPERM on error.
1112  *
1113  *    This function does make the tracefile event structure point to the event
1114  *    currently pointed to by the tf->event.
1115  *
1116  *    Note : you must call a ltt_tracefile_seek to the beginning of the trace to
1117  *    reinitialize it after an error if you want results to be coherent.
1118  *    It would be the case if a end of trace last buffer has no event : the end
1119  *    of trace wouldn't be returned, but an error.
1120  *    We make the assumption there is at least one event per buffer.
1121  ****************************************************************************/
1122
1123 int ltt_tracefile_read(LttTracefile *tf)
1124 {
1125   int err;
1126
1127   err = ltt_tracefile_read_seek(tf);
1128   if(err) return err;
1129   err = ltt_tracefile_read_update_event(tf);
1130   if(err) return err;
1131
1132   /* deactivate this, as it does nothing for now
1133   err = ltt_tracefile_read_op(tf);
1134   if(err) return err;
1135   */
1136
1137   return 0;
1138 }
1139
1140 int ltt_tracefile_read_seek(LttTracefile *tf)
1141 {
1142   int err;
1143
1144   /* Get next buffer until we finally have an event, or end of trace */
1145   while(1) {
1146     err = ltt_seek_next_event(tf);
1147     if(unlikely(err == ENOPROTOOPT)) {
1148       return EPERM;
1149     }
1150
1151     /* Are we at the end of the buffer ? */
1152     if(err == ERANGE) {
1153       if(unlikely(tf->buffer.index == tf->num_blocks-1)){ /* end of trace ? */
1154         return ERANGE;
1155       } else {
1156         /* get next block */
1157         err = map_block(tf, tf->buffer.index + 1);
1158         if(unlikely(err)) {
1159           g_error("Can not map block");
1160           return EPERM;
1161         }
1162       }
1163     } else break; /* We found an event ! */
1164   }
1165
1166   return 0;
1167 }
1168
1169 /* do an operation when reading a new event */
1170
1171 /* This function does nothing for now */
1172 #if 0
1173 int ltt_tracefile_read_op(LttTracefile *tf)
1174 {
1175   LttEvent *event;
1176
1177   event = &tf->event;
1178
1179   /* do event specific operation */
1180
1181   /* nothing */
1182
1183   return 0;
1184 }
1185 #endif
1186
1187 static void print_debug_event_header(LttEvent *ev, void *start_pos, void *end_pos)
1188 {
1189   unsigned int offset = 0;
1190   int i, j;
1191
1192   g_printf("Event header (tracefile %s offset %llx):\n",
1193     g_quark_to_string(ev->tracefile->long_name),
1194     ((uint64_t)ev->tracefile->buffer.index * ev->tracefile->buf_size)
1195       + (long)start_pos - (long)ev->tracefile->buffer.head);
1196
1197   while (offset < (long)end_pos - (long)start_pos) {
1198     g_printf("%8lx", (long)start_pos - (long)ev->tracefile->buffer.head + offset);
1199     g_printf("    ");
1200
1201     for (i = 0; i < 4 ; i++) {
1202       for (j = 0; j < 4; j++) {
1203         if (offset + ((i * 4) + j) <
1204                 (long)end_pos - (long)start_pos)
1205           g_printf("%02hhX",
1206             ((char*)start_pos)[offset + ((i * 4) + j)]);
1207         else
1208           g_printf("  ");
1209         g_printf(" ");
1210       }
1211       if (i < 4)
1212       g_printf(" ");
1213     }
1214     offset+=16;
1215     g_printf("\n");
1216   }
1217 }
1218
1219
1220 /* same as ltt_tracefile_read, but does not seek to the next event nor call
1221  * event specific operation. */
1222 int ltt_tracefile_read_update_event(LttTracefile *tf)
1223 {
1224   void * pos;
1225   LttEvent *event;
1226   void *pos_aligned;
1227
1228   event = &tf->event;
1229   pos = tf->buffer.head + event->offset;
1230
1231   /* Read event header */
1232
1233   /* Align the head */
1234   pos += ltt_align((size_t)pos, sizeof(guint32), tf->alignment);
1235   pos_aligned = pos;
1236
1237   event->timestamp = ltt_get_uint32(LTT_GET_BO(tf), pos);
1238   event->event_id = event->timestamp >> tf->tscbits;
1239   event->timestamp = event->timestamp & tf->tsc_mask;
1240   pos += sizeof(guint32);
1241
1242   switch (event->event_id) {
1243   case 29:  /* LTT_RFLAG_ID_SIZE_TSC */
1244     event->event_id = ltt_get_uint16(LTT_GET_BO(tf), pos);
1245     pos += sizeof(guint16);
1246     event->event_size = ltt_get_uint16(LTT_GET_BO(tf), pos);
1247     pos += sizeof(guint16);
1248     if (event->event_size == 0xFFFF) {
1249       event->event_size = ltt_get_uint32(LTT_GET_BO(tf), pos);
1250       pos += sizeof(guint32);
1251     }
1252     pos += ltt_align((size_t)pos, sizeof(guint64), tf->alignment);
1253     tf->buffer.tsc = ltt_get_uint64(LTT_GET_BO(tf), pos);
1254     pos += sizeof(guint64);
1255     break;
1256   case 30:  /* LTT_RFLAG_ID_SIZE */
1257     event->event_id = ltt_get_uint16(LTT_GET_BO(tf), pos);
1258     pos += sizeof(guint16);
1259     event->event_size = ltt_get_uint16(LTT_GET_BO(tf), pos);
1260     pos += sizeof(guint16);
1261     if (event->event_size == 0xFFFF) {
1262       event->event_size = ltt_get_uint32(LTT_GET_BO(tf), pos);
1263       pos += sizeof(guint32);
1264     }
1265     break;
1266   case 31: /* LTT_RFLAG_ID */
1267     event->event_id = ltt_get_uint16(LTT_GET_BO(tf), pos);
1268     pos += sizeof(guint16);
1269     event->event_size = G_MAXUINT;
1270     break;
1271   default:
1272     event->event_size = G_MAXUINT;
1273     break;
1274   }
1275
1276   if (likely(event->event_id != 29)) {
1277       /* No extended timestamp */
1278       if (event->timestamp < (tf->buffer.tsc & tf->tsc_mask))
1279         tf->buffer.tsc = ((tf->buffer.tsc & ~tf->tsc_mask)  /* overflow */
1280                             + tf->tsc_mask_next_bit)
1281                                 | (guint64)event->timestamp;
1282       else
1283         tf->buffer.tsc = (tf->buffer.tsc & ~tf->tsc_mask)   /* no overflow */
1284                                 | (guint64)event->timestamp;
1285   }
1286   event->tsc = tf->buffer.tsc;
1287
1288   event->event_time = ltt_interpolate_time(tf, event);
1289
1290   if (a_event_debug)
1291     print_debug_event_header(event, pos_aligned, pos);
1292
1293   event->data = pos;
1294
1295   /*
1296    * Let ltt_update_event_size update event->data according to the largest
1297    * alignment within the payload.
1298    * Get the data size and update the event fields with the current
1299    * information. */
1300   ltt_update_event_size(tf);
1301
1302   return 0;
1303 }
1304
1305
1306 /****************************************************************************
1307  *Function name
1308  *    map_block       : map a block from the file
1309  *Input Params
1310  *    lttdes          : ltt trace file
1311  *    whichBlock      : the block which will be read
1312  *return value
1313  *    0               : success
1314  *    EINVAL          : lseek fail
1315  *    EIO             : can not read from the file
1316  ****************************************************************************/
1317
1318 static gint map_block(LttTracefile * tf, guint block_num)
1319 {
1320   int page_size = getpagesize();
1321   ltt_subbuffer_header_t *header;
1322
1323   g_assert(block_num < tf->num_blocks);
1324
1325   if(tf->buffer.head != NULL) {
1326     if(munmap(tf->buffer.head, PAGE_ALIGN(tf->buf_size))) {
1327     g_warning("unmap size : %u\n",
1328         PAGE_ALIGN(tf->buf_size));
1329       perror("munmap error");
1330       g_assert(0);
1331     }
1332   }
1333
1334   /* Multiple of pages aligned head */
1335   tf->buffer.head = mmap(0,
1336       PAGE_ALIGN(tf->buf_size),
1337       PROT_READ, MAP_PRIVATE, tf->fd,
1338       PAGE_ALIGN((off_t)tf->buf_size * (off_t)block_num));
1339
1340   if(tf->buffer.head == MAP_FAILED) {
1341     perror("Error in allocating memory for buffer of tracefile");
1342     g_assert(0);
1343     goto map_error;
1344   }
1345   g_assert( ( (gulong)tf->buffer.head&(8-1) ) == 0); // make sure it's aligned.
1346
1347
1348   tf->buffer.index = block_num;
1349
1350   header = (ltt_subbuffer_header_t *)tf->buffer.head;
1351
1352   tf->buffer.begin.cycle_count = ltt_get_uint64(LTT_GET_BO(tf),
1353                                               &header->cycle_count_begin);
1354   tf->buffer.begin.freq = tf->trace->start_freq;
1355
1356   tf->buffer.begin.timestamp = ltt_interpolate_time_from_tsc(tf,
1357                                           tf->buffer.begin.cycle_count);
1358   tf->buffer.end.cycle_count = ltt_get_uint64(LTT_GET_BO(tf),
1359                                               &header->cycle_count_end);
1360   tf->buffer.end.freq = tf->trace->start_freq;
1361
1362   tf->buffer.lost_size = ltt_get_uint32(LTT_GET_BO(tf),
1363                                         &header->lost_size);
1364   tf->buffer.end.timestamp = ltt_interpolate_time_from_tsc(tf,
1365                                         tf->buffer.end.cycle_count);
1366   tf->buffer.tsc =  tf->buffer.begin.cycle_count;
1367   tf->event.tsc = tf->buffer.tsc;
1368   tf->buffer.freq = tf->buffer.begin.freq;
1369
1370   /* FIXME
1371    * eventually support variable buffer size : will need a partial pre-read of
1372    * the headers to create an index when we open the trace... eventually. */
1373   g_assert(tf->buf_size  == ltt_get_uint32(LTT_GET_BO(tf),
1374                                              &header->buf_size));
1375
1376   /* Make the current event point to the beginning of the buffer :
1377    * it means that the event read must get the first event. */
1378   tf->event.tracefile = tf;
1379   tf->event.block = block_num;
1380   tf->event.offset = 0;
1381
1382   return 0;
1383
1384 map_error:
1385   return -errno;
1386 }
1387
1388 static void print_debug_event_data(LttEvent *ev)
1389 {
1390   unsigned int offset = 0;
1391   int i, j;
1392
1393   if (!max(ev->event_size, ev->data_size))
1394     return;
1395
1396   g_printf("Event data (tracefile %s offset %llx):\n",
1397     g_quark_to_string(ev->tracefile->long_name),
1398     ((uint64_t)ev->tracefile->buffer.index * ev->tracefile->buf_size)
1399       + (long)ev->data - (long)ev->tracefile->buffer.head);
1400
1401   while (offset < max(ev->event_size, ev->data_size)) {
1402     g_printf("%8lx", (long)ev->data + offset
1403       - (long)ev->tracefile->buffer.head);
1404     g_printf("    ");
1405
1406     for (i = 0; i < 4 ; i++) {
1407       for (j = 0; j < 4; j++) {
1408         if (offset + ((i * 4) + j) < max(ev->event_size, ev->data_size))
1409           g_printf("%02hhX", ((char*)ev->data)[offset + ((i * 4) + j)]);
1410         else
1411           g_printf("  ");
1412         g_printf(" ");
1413       }
1414       if (i < 4)
1415       g_printf(" ");
1416     }
1417
1418     g_printf("    ");
1419
1420     for (i = 0; i < 4; i++) {
1421       for (j = 0; j < 4; j++) {
1422         if (offset + ((i * 4) + j) < max(ev->event_size, ev->data_size)) {
1423           if (isprint(((char*)ev->data)[offset + ((i * 4) + j)]))
1424             g_printf("%c", ((char*)ev->data)[offset + ((i * 4) + j)]);
1425           else
1426             g_printf(".");
1427         } else
1428           g_printf("  ");
1429       }
1430     }
1431     offset+=16;
1432     g_printf("\n");
1433   }
1434 }
1435
1436 /* It will update the fields offsets too */
1437 void ltt_update_event_size(LttTracefile *tf)
1438 {
1439   off_t size = 0;
1440   char *tscdata;
1441   struct marker_info *info;
1442
1443   switch((enum marker_id)tf->event.event_id) {
1444     case MARKER_ID_SET_MARKER_ID:
1445       size = strlen((char*)tf->event.data) + 1;
1446       g_debug("marker %s id set", (char*)tf->event.data);
1447       size += ltt_align(size, sizeof(guint16), tf->alignment);
1448       size += sizeof(guint16);
1449       size += sizeof(guint8);
1450       size += sizeof(guint8);
1451       size += sizeof(guint8);
1452       size += sizeof(guint8);
1453       size += sizeof(guint8);
1454       break;
1455     case MARKER_ID_SET_MARKER_FORMAT:
1456       g_debug("marker %s format set", (char*)tf->event.data);
1457       size = strlen((char*)tf->event.data) + 1;
1458       size += strlen((char*)tf->event.data + size) + 1;
1459       break;
1460   }
1461
1462   info = marker_get_info_from_id(tf->trace, tf->event.event_id);
1463
1464   if (tf->event.event_id >= MARKER_CORE_IDS)
1465     g_assert(info != NULL);
1466
1467   /* Do not update field offsets of core markers when initially reading the
1468    * metadata tracefile when the infos about these markers do not exist yet.
1469    */
1470   if (likely(info && info->fields)) {
1471     /* alignment */
1472     tf->event.data += ltt_align((off_t)(unsigned long)tf->event.data,
1473                              info->largest_align,
1474                              info->alignment);
1475     /* size, dynamically computed */
1476     if (info->size != -1)
1477       size = info->size;
1478     else
1479       size = marker_update_fields_offsets(marker_get_info_from_id(tf->trace,
1480                                    tf->event.event_id), tf->event.data);
1481   }
1482
1483   tf->event.data_size = size;
1484
1485   /* Check consistency between kernel and LTTV structure sizes */
1486   if(tf->event.event_size == G_MAXUINT) {
1487     /* Event size too big to fit in the event size field */
1488     tf->event.event_size = tf->event.data_size;
1489   }
1490
1491   if (a_event_debug)
1492     print_debug_event_data(&tf->event);
1493
1494   /* Having a marker load or marker format event out of the metadata
1495    * tracefiles is a serious bug. */
1496   switch((enum marker_id)tf->event.event_id) {
1497     case MARKER_ID_SET_MARKER_ID:
1498     case MARKER_ID_SET_MARKER_FORMAT:
1499       if (tf->name != g_quark_from_string("/control/metadata"))
1500         g_error("Trace inconsistency : metadata event found in data "
1501                 "tracefile %s", g_quark_to_string(tf->long_name));
1502   }
1503
1504   if (tf->event.data_size != tf->event.event_size) {
1505     struct marker_info *info = marker_get_info_from_id(tf->trace,
1506                                                        tf->event.event_id);
1507     g_error("Kernel/LTTV event size differs for event %s: kernel %u, LTTV %u",
1508         g_quark_to_string(info->name),
1509         tf->event.event_size, tf->event.data_size);
1510     exit(-1);
1511   }
1512 }
1513
1514
1515 /* Take the tf current event offset and use the event id to figure out where is
1516  * the next event offset.
1517  *
1518  * This is an internal function not aiming at being used elsewhere : it will
1519  * not jump over the current block limits. Please consider using
1520  * ltt_tracefile_read to do this.
1521  *
1522  * Returns 0 on success
1523  *         ERANGE if we are at the end of the buffer.
1524  *         ENOPROTOOPT if an error occured when getting the current event size.
1525  */
1526 static int ltt_seek_next_event(LttTracefile *tf)
1527 {
1528   int ret = 0;
1529   void *pos;
1530
1531   /* seek over the buffer header if we are at the buffer start */
1532   if(tf->event.offset == 0) {
1533     tf->event.offset += tf->buffer_header_size;
1534
1535     if(tf->event.offset == tf->buf_size - tf->buffer.lost_size) {
1536       ret = ERANGE;
1537     }
1538     goto found;
1539   }
1540
1541   pos = tf->event.data;
1542
1543   if(tf->event.data_size < 0) goto error;
1544
1545   pos += (size_t)tf->event.data_size;
1546
1547   tf->event.offset = pos - tf->buffer.head;
1548
1549   if(tf->event.offset == tf->buf_size - tf->buffer.lost_size) {
1550     ret = ERANGE;
1551     goto found;
1552   }
1553   g_assert(tf->event.offset < tf->buf_size - tf->buffer.lost_size);
1554
1555 found:
1556   return ret;
1557
1558 error:
1559   g_error("Error in ltt_seek_next_event for tracefile %s",
1560       g_quark_to_string(tf->name));
1561   return ENOPROTOOPT;
1562 }
1563
1564 #if 0
1565 /*****************************************************************************
1566  *Function name
1567  *    set_fields_offsets : set the precomputable offset of the fields
1568  *Input params
1569  *    tracefile       : opened trace file
1570  *    event_type      : the event type
1571  ****************************************************************************/
1572
1573 void set_fields_offsets(LttTracefile *tf, LttEventType *event_type)
1574 {
1575   LttField *field = event_type->root_field;
1576   enum field_status fixed_root = FIELD_FIXED, fixed_parent = FIELD_FIXED;
1577
1578   if(likely(field))
1579     preset_field_type_size(tf, event_type, 0, 0,
1580         &fixed_root, &fixed_parent,
1581         field);
1582
1583 }
1584 #endif //0
1585
1586
1587 /*****************************************************************************
1588  *Function name
1589  *    get_alignment : Get the alignment needed for a field.
1590  *Input params
1591  *    field : field
1592  *
1593  *    returns : The size on which it must be aligned.
1594  *
1595  ****************************************************************************/
1596 #if 0
1597 off_t get_alignment(LttField *field)
1598 {
1599   LttType *type = &field->field_type;
1600
1601   switch(type->type_class) {
1602     case LTT_INT_FIXED:
1603     case LTT_UINT_FIXED:
1604     case LTT_POINTER:
1605     case LTT_CHAR:
1606     case LTT_UCHAR:
1607     case LTT_SHORT:
1608     case LTT_USHORT:
1609     case LTT_INT:
1610     case LTT_UINT:
1611     case LTT_LONG:
1612     case LTT_ULONG:
1613     case LTT_SIZE_T:
1614     case LTT_SSIZE_T:
1615     case LTT_OFF_T:
1616     case LTT_FLOAT:
1617     case LTT_ENUM:
1618       /* Align offset on type size */
1619       g_assert(field->field_size != 0);
1620       return field->field_size;
1621       break;
1622     case LTT_STRING:
1623       return 1;
1624       break;
1625     case LTT_ARRAY:
1626       g_assert(type->fields->len == 1);
1627       {
1628         LttField *child = &g_array_index(type->fields, LttField, 0);
1629         return get_alignment(child);
1630       }
1631       break;
1632     case LTT_SEQUENCE:
1633       g_assert(type->fields->len == 2);
1634       {
1635         off_t localign = 1;
1636         LttField *child = &g_array_index(type->fields, LttField, 0);
1637
1638         localign = max(localign, get_alignment(child));
1639
1640         child = &g_array_index(type->fields, LttField, 1);
1641         localign = max(localign, get_alignment(child));
1642
1643         return localign;
1644       }
1645       break;
1646     case LTT_STRUCT:
1647     case LTT_UNION:
1648       {
1649         guint i;
1650         off_t localign = 1;
1651
1652         for(i=0; i<type->fields->len; i++) {
1653           LttField *child = &g_array_index(type->fields, LttField, i);
1654           localign = max(localign, get_alignment(child));
1655         }
1656         return localign;
1657       }
1658       break;
1659     case LTT_NONE:
1660     default:
1661       g_error("get_alignment : unknown type");
1662       return -1;
1663   }
1664 }
1665
1666 #endif //0
1667
1668 /*****************************************************************************
1669  *Function name
1670  *    field_compute_static_size : Determine the size of fields known by their
1671  *    sole definition. Unions, arrays and struct sizes might be known, but
1672  *    the parser does not give that information.
1673  *Input params
1674  *    tf : tracefile
1675  *    field : field
1676  *
1677  ****************************************************************************/
1678 #if 0
1679 void field_compute_static_size(LttFacility *fac, LttField *field)
1680 {
1681   LttType *type = &field->field_type;
1682
1683   switch(type->type_class) {
1684     case LTT_INT_FIXED:
1685     case LTT_UINT_FIXED:
1686     case LTT_POINTER:
1687     case LTT_CHAR:
1688     case LTT_UCHAR:
1689     case LTT_SHORT:
1690     case LTT_USHORT:
1691     case LTT_INT:
1692     case LTT_UINT:
1693     case LTT_LONG:
1694     case LTT_ULONG:
1695     case LTT_SIZE_T:
1696     case LTT_SSIZE_T:
1697     case LTT_OFF_T:
1698     case LTT_FLOAT:
1699     case LTT_ENUM:
1700     case LTT_STRING:
1701       /* nothing to do */
1702       break;
1703     case LTT_ARRAY:
1704       /* note this : array type size is the number of elements in the array,
1705        * while array field size of the length of the array in bytes */
1706       g_assert(type->fields->len == 1);
1707       {
1708         LttField *child = &g_array_index(type->fields, LttField, 0);
1709         field_compute_static_size(fac, child);
1710
1711         if(child->field_size != 0) {
1712           field->field_size = type->size * child->field_size;
1713           field->dynamic_offsets = g_array_sized_new(FALSE, TRUE,
1714               sizeof(off_t), type->size);
1715         } else {
1716           field->field_size = 0;
1717         }
1718       }
1719       break;
1720     case LTT_SEQUENCE:
1721       g_assert(type->fields->len == 2);
1722       {
1723         off_t local_offset = 0;
1724         LttField *child = &g_array_index(type->fields, LttField, 1);
1725         field_compute_static_size(fac, child);
1726         field->field_size = 0;
1727         type->size = 0;
1728         if(child->field_size != 0) {
1729           field->dynamic_offsets = g_array_sized_new(FALSE, TRUE,
1730               sizeof(off_t), SEQUENCE_AVG_ELEMENTS);
1731         }
1732       }
1733       break;
1734     case LTT_STRUCT:
1735     case LTT_UNION:
1736       {
1737         guint i;
1738         for(i=0;i<type->fields->len;i++) {
1739           LttField *child = &g_array_index(type->fields, LttField, i);
1740           field_compute_static_size(fac, child);
1741           if(child->field_size != 0) {
1742             type->size += ltt_align(type->size, get_alignment(child),
1743                                     fac->alignment);
1744             type->size += child->field_size;
1745           } else {
1746             /* As soon as we find a child with variable size, we have
1747              * a variable size */
1748             type->size = 0;
1749             break;
1750           }
1751         }
1752         field->field_size = type->size;
1753       }
1754       break;
1755     default:
1756       g_error("field_static_size : unknown type");
1757   }
1758
1759 }
1760 #endif //0
1761
1762
1763 /*****************************************************************************
1764  *Function name
1765  *    precompute_fields_offsets : set the precomputable offset of the fields
1766  *Input params
1767  *    fac : facility
1768  *    field : the field
1769  *    offset : pointer to the current offset, must be incremented
1770  *
1771  *    return : 1 : found a variable length field, stop the processing.
1772  *             0 otherwise.
1773  ****************************************************************************/
1774
1775 #if 0
1776 gint precompute_fields_offsets(LttFacility *fac, LttField *field, off_t *offset, gint is_compact)
1777 {
1778   LttType *type = &field->field_type;
1779
1780   if(unlikely(is_compact)) {
1781     g_assert(field->field_size != 0);
1782     /* FIXME THIS IS A HUUUUUGE hack :
1783      * offset is between the compact_data field in struct LttEvent
1784      * and the address of the field root in the memory map.
1785      * ark. Both will stay at the same addresses while the event
1786      * is readable, so it's ok.
1787      */
1788     field->offset_root = 0;
1789     field->fixed_root = FIELD_FIXED;
1790     return 0;
1791   }
1792
1793   switch(type->type_class) {
1794     case LTT_INT_FIXED:
1795     case LTT_UINT_FIXED:
1796     case LTT_POINTER:
1797     case LTT_CHAR:
1798     case LTT_UCHAR:
1799     case LTT_SHORT:
1800     case LTT_USHORT:
1801     case LTT_INT:
1802     case LTT_UINT:
1803     case LTT_LONG:
1804     case LTT_ULONG:
1805     case LTT_SIZE_T:
1806     case LTT_SSIZE_T:
1807     case LTT_OFF_T:
1808     case LTT_FLOAT:
1809     case LTT_ENUM:
1810       g_assert(field->field_size != 0);
1811       /* Align offset on type size */
1812       *offset += ltt_align(*offset, get_alignment(field),
1813                            fac->alignment);
1814       /* remember offset */
1815       field->offset_root = *offset;
1816       field->fixed_root = FIELD_FIXED;
1817       /* Increment offset */
1818       *offset += field->field_size;
1819       return 0;
1820       break;
1821     case LTT_STRING:
1822       field->offset_root = *offset;
1823       field->fixed_root = FIELD_FIXED;
1824       return 1;
1825       break;
1826     case LTT_ARRAY:
1827       g_assert(type->fields->len == 1);
1828       {
1829         LttField *child = &g_array_index(type->fields, LttField, 0);
1830
1831         *offset += ltt_align(*offset, get_alignment(field),
1832                              fac->alignment);
1833
1834         /* remember offset */
1835         field->offset_root = *offset;
1836         field->array_offset = *offset;
1837         field->fixed_root = FIELD_FIXED;
1838
1839         /* Let the child be variable */
1840         //precompute_fields_offsets(tf, child, offset);
1841
1842         if(field->field_size != 0) {
1843           /* Increment offset */
1844           /* field_size is the array size in bytes */
1845           *offset += field->field_size;
1846           return 0;
1847         } else {
1848           return 1;
1849         }
1850       }
1851       break;
1852     case LTT_SEQUENCE:
1853       g_assert(type->fields->len == 2);
1854       {
1855         LttField *child;
1856         guint ret;
1857
1858         *offset += ltt_align(*offset, get_alignment(field),
1859                              fac->alignment);
1860
1861         /* remember offset */
1862         field->offset_root = *offset;
1863         field->fixed_root = FIELD_FIXED;
1864
1865         child = &g_array_index(type->fields, LttField, 0);
1866         ret = precompute_fields_offsets(fac, child, offset, is_compact);
1867         g_assert(ret == 0); /* Seq len cannot have variable len */
1868
1869         child = &g_array_index(type->fields, LttField, 1);
1870         *offset += ltt_align(*offset, get_alignment(child),
1871                              fac->alignment);
1872         field->array_offset = *offset;
1873         /* Let the child be variable. */
1874         //ret = precompute_fields_offsets(fac, child, offset);
1875
1876         /* Cannot precompute fields offsets of sequence members, and has
1877          * variable length. */
1878         return 1;
1879       }
1880       break;
1881     case LTT_STRUCT:
1882       {
1883         LttField *child;
1884         guint i;
1885         gint ret=0;
1886
1887         *offset += ltt_align(*offset, get_alignment(field),
1888                              fac->alignment);
1889         /* remember offset */
1890         field->offset_root = *offset;
1891         field->fixed_root = FIELD_FIXED;
1892
1893         for(i=0; i< type->fields->len; i++) {
1894           child = &g_array_index(type->fields, LttField, i);
1895           ret = precompute_fields_offsets(fac, child, offset, is_compact);
1896
1897           if(ret) break;
1898         }
1899         return ret;
1900       }
1901       break;
1902     case LTT_UNION:
1903       {
1904         LttField *child;
1905         guint i;
1906         gint ret=0;
1907
1908         *offset += ltt_align(*offset, get_alignment(field),
1909                              fac->alignment);
1910         /* remember offset */
1911         field->offset_root = *offset;
1912         field->fixed_root = FIELD_FIXED;
1913
1914         for(i=0; i< type->fields->len; i++) {
1915           *offset = field->offset_root;
1916           child = &g_array_index(type->fields, LttField, i);
1917           ret = precompute_fields_offsets(fac, child, offset, is_compact);
1918
1919           if(ret) break;
1920         }
1921         *offset = field->offset_root + field->field_size;
1922         return ret;
1923       }
1924
1925       break;
1926     case LTT_NONE:
1927     default:
1928       g_error("precompute_fields_offsets : unknown type");
1929       return 1;
1930   }
1931
1932 }
1933
1934 #endif //0
1935
1936 #if 0
1937 /*****************************************************************************
1938  *Function name
1939  *    precompute_offsets : set the precomputable offset of an event type
1940  *Input params
1941  *    tf : tracefile
1942  *    event : event type
1943  *
1944  ****************************************************************************/
1945 void precompute_offsets(LttFacility *fac, LttEventType *event)
1946 {
1947   guint i;
1948   off_t offset = 0;
1949   gint ret;
1950
1951   /* First, compute the size of fixed size fields. Will determine size for
1952    * arrays, struct and unions, which is not done by the parser */
1953   for(i=0; i<event->fields->len; i++) {
1954     LttField *field = &g_array_index(event->fields, LttField, i);
1955     field_compute_static_size(fac, field);
1956   }
1957
1958   /* Precompute all known offsets */
1959   for(i=0; i<event->fields->len; i++) {
1960     LttField *field = &g_array_index(event->fields, LttField, i);
1961     if(event->has_compact_data && i == 0)
1962       ret = precompute_fields_offsets(fac, field, &offset, 1);
1963     else
1964       ret = precompute_fields_offsets(fac, field, &offset, 0);
1965     if(ret) break;
1966   }
1967 }
1968 #endif //0
1969
1970
1971
1972 /*****************************************************************************
1973  *Function name
1974  *    preset_field_type_size : set the fixed sizes of the field type
1975  *Input params
1976  *    tf              : tracefile
1977  *    event_type      : event type
1978  *    offset_root     : offset from the root
1979  *    offset_parent   : offset from the parent
1980  *    fixed_root      : Do we know a fixed offset to the root ?
1981  *    fixed_parent    : Do we know a fixed offset to the parent ?
1982  *    field           : field
1983  ****************************************************************************/
1984
1985
1986
1987 // preset the fixed size offsets. Calculate them just like genevent-new : an
1988 // increment of a *to value that represents the offset from the start of the
1989 // event data.
1990 // The preset information is : offsets up to (and including) the first element
1991 // of variable size. All subsequent fields must be flagged "VARIABLE OFFSET".
1992 #if 0
1993 void preset_field_type_size(LttTracefile *tf, LttEventType *event_type,
1994     off_t offset_root, off_t offset_parent,
1995     enum field_status *fixed_root, enum field_status *fixed_parent,
1996     LttField *field)
1997 {
1998   enum field_status local_fixed_root, local_fixed_parent;
1999   guint i;
2000   LttType *type;
2001
2002   g_assert(field->fixed_root == FIELD_UNKNOWN);
2003   g_assert(field->fixed_parent == FIELD_UNKNOWN);
2004   g_assert(field->fixed_size == FIELD_UNKNOWN);
2005
2006   type = field->field_type;
2007
2008   field->fixed_root = *fixed_root;
2009   if(field->fixed_root == FIELD_FIXED)
2010     field->offset_root = offset_root;
2011   else
2012     field->offset_root = 0;
2013
2014   field->fixed_parent = *fixed_parent;
2015   if(field->fixed_parent == FIELD_FIXED)
2016     field->offset_parent = offset_parent;
2017   else
2018     field->offset_parent = 0;
2019
2020   size_t current_root_offset;
2021   size_t current_offset;
2022   enum field_status current_child_status, final_child_status;
2023   size_t max_size;
2024
2025   switch(type->type_class) {
2026     case LTT_INT_FIXED:
2027     case LTT_UINT_FIXED:
2028     case LTT_CHAR:
2029     case LTT_UCHAR:
2030     case LTT_SHORT:
2031     case LTT_USHORT:
2032     case LTT_INT:
2033     case LTT_UINT:
2034     case LTT_FLOAT:
2035     case LTT_ENUM:
2036       field->field_size = ltt_type_size(tf->trace, type);
2037       field->fixed_size = FIELD_FIXED;
2038       break;
2039     case LTT_POINTER:
2040       field->field_size = (off_t)event_type->facility->pointer_size;
2041       field->fixed_size = FIELD_FIXED;
2042       break;
2043     case LTT_LONG:
2044     case LTT_ULONG:
2045       field->field_size = (off_t)event_type->facility->long_size;
2046       field->fixed_size = FIELD_FIXED;
2047       break;
2048     case LTT_SIZE_T:
2049     case LTT_SSIZE_T:
2050     case LTT_OFF_T:
2051       field->field_size = (off_t)event_type->facility->size_t_size;
2052       field->fixed_size = FIELD_FIXED;
2053       break;
2054     case LTT_SEQUENCE:
2055       local_fixed_root = FIELD_VARIABLE;
2056       local_fixed_parent = FIELD_VARIABLE;
2057       preset_field_type_size(tf, event_type,
2058         0, 0,
2059         &local_fixed_root, &local_fixed_parent,
2060         field->child[0]);
2061       field->fixed_size = FIELD_VARIABLE;
2062       field->field_size = 0;
2063       *fixed_root = FIELD_VARIABLE;
2064       *fixed_parent = FIELD_VARIABLE;
2065       break;
2066     case LTT_STRING:
2067       field->fixed_size = FIELD_VARIABLE;
2068       field->field_size = 0;
2069       *fixed_root = FIELD_VARIABLE;
2070       *fixed_parent = FIELD_VARIABLE;
2071       break;
2072     case LTT_ARRAY:
2073       local_fixed_root = FIELD_VARIABLE;
2074       local_fixed_parent = FIELD_VARIABLE;
2075       preset_field_type_size(tf, event_type,
2076         0, 0,
2077         &local_fixed_root, &local_fixed_parent,
2078         field->child[0]);
2079       field->fixed_size = field->child[0]->fixed_size;
2080       if(field->fixed_size == FIELD_FIXED) {
2081         field->field_size = type->element_number * field->child[0]->field_size;
2082       } else {
2083         field->field_size = 0;
2084         *fixed_root = FIELD_VARIABLE;
2085         *fixed_parent = FIELD_VARIABLE;
2086       }
2087       break;
2088     case LTT_STRUCT:
2089       current_root_offset = field->offset_root;
2090       current_offset = 0;
2091       current_child_status = FIELD_FIXED;
2092       for(i=0;i<type->element_number;i++) {
2093         preset_field_type_size(tf, event_type,
2094           current_root_offset, current_offset,
2095           fixed_root, &current_child_status,
2096           field->child[i]);
2097         if(current_child_status == FIELD_FIXED) {
2098           current_root_offset += field->child[i]->field_size;
2099           current_offset += field->child[i]->field_size;
2100         } else {
2101           current_root_offset = 0;
2102           current_offset = 0;
2103         }
2104       }
2105       if(current_child_status != FIELD_FIXED) {
2106         *fixed_parent = current_child_status;
2107         field->field_size = 0;
2108         field->fixed_size = current_child_status;
2109       } else {
2110         field->field_size = current_offset;
2111         field->fixed_size = FIELD_FIXED;
2112       }
2113       break;
2114     case LTT_UNION:
2115       current_root_offset = field->offset_root;
2116       current_offset = 0;
2117       max_size = 0;
2118       final_child_status = FIELD_FIXED;
2119       for(i=0;i<type->element_number;i++) {
2120         enum field_status current_root_child_status = FIELD_FIXED;
2121         enum field_status current_child_status = FIELD_FIXED;
2122         preset_field_type_size(tf, event_type,
2123           current_root_offset, current_offset,
2124           &current_root_child_status, &current_child_status,
2125           field->child[i]);
2126         if(current_child_status != FIELD_FIXED)
2127           final_child_status = current_child_status;
2128         else
2129           max_size = max(max_size, field->child[i]->field_size);
2130       }
2131       if(final_child_status != FIELD_FIXED) {
2132         g_error("LTTV does not support variable size fields in unions.");
2133         /* This will stop the application. */
2134         *fixed_root = final_child_status;
2135         *fixed_parent = final_child_status;
2136         field->field_size = 0;
2137         field->fixed_size = current_child_status;
2138       } else {
2139         field->field_size = max_size;
2140         field->fixed_size = FIELD_FIXED;
2141       }
2142       break;
2143     case LTT_NONE:
2144       g_error("unexpected type NONE");
2145       break;
2146   }
2147
2148 }
2149 #endif //0
2150
2151 /*****************************************************************************
2152  *Function name
2153  *    check_fields_compatibility : Check for compatibility between two fields :
2154  *    do they use the same inner structure ?
2155  *Input params
2156  *    event_type1     : event type
2157  *    event_type2     : event type
2158  *    field1          : field
2159  *    field2          : field
2160  *Returns : 0 if identical
2161  *          1 if not.
2162  ****************************************************************************/
2163 // this function checks for equality of field types. Therefore, it does not use
2164 // per se offsets. For instance, an aligned version of a structure is
2165 // compatible with an unaligned version of the same structure.
2166 #if 0
2167 gint check_fields_compatibility(LttEventType *event_type1,
2168     LttEventType *event_type2,
2169     LttField *field1, LttField *field2)
2170 {
2171   guint different = 0;
2172   LttType *type1;
2173   LttType *type2;
2174
2175   if(field1 == NULL) {
2176     if(field2 == NULL) goto end;
2177     else {
2178       different = 1;
2179       goto end;
2180     }
2181   } else if(field2 == NULL) {
2182     different = 1;
2183     goto end;
2184   }
2185
2186   type1 = &field1->field_type;
2187   type2 = &field2->field_type;
2188
2189   if(type1->type_class != type2->type_class) {
2190     different = 1;
2191     goto end;
2192   }
2193   if(type1->network != type2->network) {
2194     different = 1;
2195     goto end;
2196   }
2197
2198   switch(type1->type_class) {
2199     case LTT_INT_FIXED:
2200     case LTT_UINT_FIXED:
2201     case LTT_POINTER:
2202     case LTT_CHAR:
2203     case LTT_UCHAR:
2204     case LTT_SHORT:
2205     case LTT_USHORT:
2206     case LTT_INT:
2207     case LTT_UINT:
2208     case LTT_LONG:
2209     case LTT_ULONG:
2210     case LTT_SIZE_T:
2211     case LTT_SSIZE_T:
2212     case LTT_OFF_T:
2213     case LTT_FLOAT:
2214     case LTT_ENUM:
2215       if(field1->field_size != field2->field_size)
2216         different = 1;
2217       break;
2218     case LTT_STRING:
2219       break;
2220     case LTT_ARRAY:
2221       {
2222         LttField *child1 = &g_array_index(type1->fields, LttField, 0);
2223         LttField *child2 = &g_array_index(type2->fields, LttField, 0);
2224
2225         if(type1->size != type2->size)
2226           different = 1;
2227         if(check_fields_compatibility(event_type1, event_type2, child1, child2))
2228           different = 1;
2229       }
2230       break;
2231     case LTT_SEQUENCE:
2232       {
2233         LttField *child1 = &g_array_index(type1->fields, LttField, 1);
2234         LttField *child2 = &g_array_index(type2->fields, LttField, 1);
2235
2236         if(check_fields_compatibility(event_type1, event_type2, child1, child2))
2237           different = 1;
2238       }
2239       break;
2240     case LTT_STRUCT:
2241     case LTT_UNION:
2242       {
2243         LttField *child;
2244         guint i;
2245
2246         if(type1->fields->len != type2->fields->len) {
2247           different = 1;
2248           goto end;
2249         }
2250
2251         for(i=0; i< type1->fields->len; i++) {
2252           LttField *child1;
2253           LttField *child2;
2254           child1 = &g_array_index(type1->fields, LttField, i);
2255           child2 = &g_array_index(type2->fields, LttField, i);
2256           different = check_fields_compatibility(event_type1,
2257                         event_type2, child1, child2);
2258
2259           if(different) break;
2260         }
2261       }
2262       break;
2263     case LTT_NONE:
2264     default:
2265       g_error("check_fields_compatibility : unknown type");
2266   }
2267
2268 end:
2269   return different;
2270 }
2271 #endif //0
2272
2273 #if 0
2274 gint check_fields_compatibility(LttEventType *event_type1,
2275     LttEventType *event_type2,
2276     LttField *field1, LttField *field2)
2277 {
2278   guint different = 0;
2279   guint i;
2280   LttType *type1;
2281   LttType *type2;
2282
2283   if(field1 == NULL) {
2284     if(field2 == NULL) goto end;
2285     else {
2286       different = 1;
2287       goto end;
2288     }
2289   } else if(field2 == NULL) {
2290     different = 1;
2291     goto end;
2292   }
2293
2294   g_assert(field1->fixed_root != FIELD_UNKNOWN);
2295   g_assert(field2->fixed_root != FIELD_UNKNOWN);
2296   g_assert(field1->fixed_parent != FIELD_UNKNOWN);
2297   g_assert(field2->fixed_parent != FIELD_UNKNOWN);
2298   g_assert(field1->fixed_size != FIELD_UNKNOWN);
2299   g_assert(field2->fixed_size != FIELD_UNKNOWN);
2300
2301   type1 = field1->field_type;
2302   type2 = field2->field_type;
2303
2304   if(type1->type_class != type2->type_class) {
2305     different = 1;
2306     goto end;
2307   }
2308   if(type1->element_name != type2->element_name) {
2309     different = 1;
2310     goto end;
2311   }
2312
2313   switch(type1->type_class) {
2314     case LTT_INT_FIXED:
2315     case LTT_UINT_FIXED:
2316     case LTT_POINTER:
2317     case LTT_CHAR:
2318     case LTT_UCHAR:
2319     case LTT_SHORT:
2320     case LTT_USHORT:
2321     case LTT_INT:
2322     case LTT_UINT:
2323     case LTT_FLOAT:
2324     case LTT_POINTER:
2325     case LTT_LONG:
2326     case LTT_ULONG:
2327     case LTT_SIZE_T:
2328     case LTT_SSIZE_T:
2329     case LTT_OFF_T:
2330       if(field1->field_size != field2->field_size) {
2331         different = 1;
2332         goto end;
2333       }
2334       break;
2335     case LTT_ENUM:
2336       if(type1->element_number != type2->element_number) {
2337         different = 1;
2338         goto end;
2339       }
2340       for(i=0;i<type1->element_number;i++) {
2341         if(type1->enum_strings[i] != type2->enum_strings[i]) {
2342           different = 1;
2343           goto end;
2344         }
2345       }
2346       break;
2347     case LTT_SEQUENCE:
2348       /* Two elements : size and child */
2349       g_assert(type1->element_number != type2->element_number);
2350       for(i=0;i<type1->element_number;i++) {
2351         if(check_fields_compatibility(event_type1, event_type2,
2352           field1->child[0], field2->child[0])) {
2353           different = 1;
2354           goto end;
2355         }
2356       }
2357       break;
2358     case LTT_STRING:
2359       break;
2360     case LTT_ARRAY:
2361       if(field1->field_size != field2->field_size) {
2362         different = 1;
2363         goto end;
2364       }
2365       /* Two elements : size and child */
2366       g_assert(type1->element_number != type2->element_number);
2367       for(i=0;i<type1->element_number;i++) {
2368         if(check_fields_compatibility(event_type1, event_type2,
2369           field1->child[0], field2->child[0])) {
2370           different = 1;
2371           goto end;
2372         }
2373       }
2374       break;
2375     case LTT_STRUCT:
2376     case LTT_UNION:
2377       if(type1->element_number != type2->element_number) {
2378         different = 1;
2379         break;
2380       }
2381       for(i=0;i<type1->element_number;i++) {
2382         if(check_fields_compatibility(event_type1, event_type2,
2383           field1->child[0], field2->child[0])) {
2384           different = 1;
2385           goto end;
2386         }
2387       }
2388       break;
2389   }
2390 end:
2391   return different;
2392 }
2393 #endif //0
2394
2395
2396 /*****************************************************************************
2397  *Function name
2398  *    ltt_get_int    : get an integer number
2399  *Input params
2400  *    reverse_byte_order: must we reverse the byte order ?
2401  *    size            : the size of the integer
2402  *    ptr             : the data pointer
2403  *Return value
2404  *    gint64          : a 64 bits integer
2405  ****************************************************************************/
2406
2407 gint64 ltt_get_int(gboolean reverse_byte_order, gint size, void *data)
2408 {
2409   gint64 val;
2410
2411   switch(size) {
2412     case 1: val = *((gint8*)data); break;
2413     case 2: val = ltt_get_int16(reverse_byte_order, data); break;
2414     case 4: val = ltt_get_int32(reverse_byte_order, data); break;
2415     case 8: val = ltt_get_int64(reverse_byte_order, data); break;
2416     default: val = ltt_get_int64(reverse_byte_order, data);
2417              g_critical("get_int : integer size %d unknown", size);
2418              break;
2419   }
2420
2421   return val;
2422 }
2423
2424 /*****************************************************************************
2425  *Function name
2426  *    ltt_get_uint    : get an unsigned integer number
2427  *Input params
2428  *    reverse_byte_order: must we reverse the byte order ?
2429  *    size            : the size of the integer
2430  *    ptr             : the data pointer
2431  *Return value
2432  *    guint64         : a 64 bits unsigned integer
2433  ****************************************************************************/
2434
2435 guint64 ltt_get_uint(gboolean reverse_byte_order, gint size, void *data)
2436 {
2437   guint64 val;
2438
2439   switch(size) {
2440     case 1: val = *((gint8*)data); break;
2441     case 2: val = ltt_get_uint16(reverse_byte_order, data); break;
2442     case 4: val = ltt_get_uint32(reverse_byte_order, data); break;
2443     case 8: val = ltt_get_uint64(reverse_byte_order, data); break;
2444     default: val = ltt_get_uint64(reverse_byte_order, data);
2445              g_critical("get_uint : unsigned integer size %d unknown",
2446                  size);
2447              break;
2448   }
2449
2450   return val;
2451 }
2452
2453
2454 /* get the node name of the system */
2455
2456 char * ltt_trace_system_description_node_name (LttSystemDescription * s)
2457 {
2458   return s->node_name;
2459 }
2460
2461
2462 /* get the domain name of the system */
2463
2464 char * ltt_trace_system_description_domain_name (LttSystemDescription * s)
2465 {
2466   return s->domain_name;
2467 }
2468
2469
2470 /* get the description of the system */
2471
2472 char * ltt_trace_system_description_description (LttSystemDescription * s)
2473 {
2474   return s->description;
2475 }
2476
2477
2478 /* get the NTP corrected start time of the trace */
2479 LttTime ltt_trace_start_time(LttTrace *t)
2480 {
2481   return t->start_time;
2482 }
2483
2484 /* get the monotonic start time of the trace */
2485 LttTime ltt_trace_start_time_monotonic(LttTrace *t)
2486 {
2487   return t->start_time_from_tsc;
2488 }
2489
2490 static LttTracefile *ltt_tracefile_new()
2491 {
2492   LttTracefile *tf;
2493   tf = g_new(LttTracefile, 1);
2494   tf->event.tracefile = tf;
2495   return tf;
2496 }
2497
2498 static void ltt_tracefile_destroy(LttTracefile *tf)
2499 {
2500   g_free(tf);
2501 }
2502
2503 static void ltt_tracefile_copy(LttTracefile *dest, const LttTracefile *src)
2504 {
2505   *dest = *src;
2506 }
2507
2508 /* Before library loading... */
2509
2510 static __attribute__((constructor)) void init(void)
2511 {
2512   LTT_TRACEFILE_NAME_METADATA = g_quark_from_string("/control/metadata");
2513 }