ltt/branches/poly/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 /* Facility names used in this file */
  52
  53 GQuark LTT_FACILITY_NAME_HEARTBEAT,
  54        LTT_EVENT_NAME_HEARTBEAT,
  55        LTT_EVENT_NAME_HEARTBEAT_FULL;
  56 GQuark LTT_TRACEFILE_NAME_FACILITIES;
  57
  58 #ifndef g_open
  59 #define g_open open
  60 #endif
  61
  62
  63 #define __UNUSED__ __attribute__((__unused__))
  64
  65 #define g_info(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, format)
  66
  67 #ifndef g_debug
  68 #define g_debug(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, format)
  69 #endif
  70
  71 #define g_close close
  72
  73 /* Those macros must be called from within a function where page_size is a known
  74  * variable */
  75 #define PAGE_MASK (~(page_size-1))
  76 #define PAGE_ALIGN(addr)  (((addr)+page_size-1)&PAGE_MASK)
  77
  78 LttTrace *father_trace = NULL;
  79
  80 /* set the offset of the fields belonging to the event,
  81    need the information of the archecture */
  82 //void set_fields_offsets(LttTracefile *tf, LttEventType *event_type);
  83 //size_t get_fields_offsets(LttTracefile *tf, LttEventType *event_type, void *data);
  84
  85 /* get the size of the field type according to
  86  * The facility size information. */
  87 #if 0
  88 static inline void preset_field_type_size(LttTracefile *tf,
  89     LttEventType *event_type,
  90     off_t offset_root, off_t offset_parent,
  91     enum field_status *fixed_root, enum field_status *fixed_parent,
  92     LttField *field);
  93 #endif //0
  94
  95 /* map a fixed size or a block information from the file (fd) */
  96 static gint map_block(LttTracefile * tf, guint block_num);
  97
  98 /* calculate nsec per cycles for current block */
  99 #if 0
 100 static guint32 calc_nsecs_per_cycle(LttTracefile * t);
 101 static guint64 cycles_2_ns(LttTracefile *tf, guint64 cycles);
 102 #endif //0
 103
 104 /* go to the next event */
 105 static int ltt_seek_next_event(LttTracefile *tf);
 106
 107 static int open_tracefiles(LttTrace *trace, gchar *root_path,
 108     gchar *relative_path);
 109 static int ltt_process_facility_tracefile(LttTracefile *tf);
 110 static void ltt_tracefile_time_span_get(LttTracefile *tf,
 111                                         LttTime *start, LttTime *end);
 112 static void group_time_span_get(GQuark name, gpointer data, gpointer user_data);
 113 static gint map_block(LttTracefile * tf, guint block_num);
 114 static void ltt_update_event_size(LttTracefile *tf);
 115
 116 /* Enable event debugging */
 117 static int a_event_debug = 0;
 118
 119 void ltt_event_debug(int state)
 120 {
 121   a_event_debug = state;
 122 }
 123
 124 /* trace can be NULL
 125  *
 126  * Return value : 0 success, 1 bad tracefile
 127  */
 128 static int parse_trace_header(void *header, LttTracefile *tf, LttTrace *t)
 129 {
 130   guint32 *magic_number = (guint32*)header;
 131   struct ltt_trace_header_any *any = (struct ltt_trace_header_any *)header;
 132
 133   if(*magic_number == LTT_MAGIC_NUMBER)
 134     tf->reverse_bo = 0;
 135   else if(*magic_number == LTT_REV_MAGIC_NUMBER)
 136     tf->reverse_bo = 1;
 137   else  /* invalid magic number, bad tracefile ! */
 138     return 1;
 139
 140   /* Get float byte order : might be different from int byte order
 141    * (or is set to 0 if the trace has no float (kernel trace)) */
 142   tf->float_word_order = any->float_word_order;
 143         tf->alignment = any->alignment;
 144   tf->has_heartbeat = any->has_heartbeat;
 145
 146   if(t) {
 147     t->arch_type = ltt_get_uint32(LTT_GET_BO(tf),
 148                           &any->arch_type);
 149     t->arch_variant = ltt_get_uint32(LTT_GET_BO(tf),
 150         &any->arch_variant);
 151     t->arch_size = any->arch_size;
 152     t->ltt_major_version = any->major_version;
 153     t->ltt_minor_version = any->minor_version;
 154     t->flight_recorder = any->flight_recorder;
 155    // t->compact_facilities = NULL;
 156   }
 157
 158   switch(any->major_version) {
 159
 160   case 0:
 161     g_warning("Unsupported trace version : %hhu.%hhu",
 162           any->major_version, any->minor_version);
 163     return 1;
 164     break;
 165   case 1:
 166     switch(any->minor_version) {
 167     case 0:
 168       {
 169         struct ltt_trace_header_1_0 *vheader =
 170           (struct ltt_trace_header_1_0 *)header;
 171         tf->buffer_header_size =
 172          sizeof(struct ltt_block_start_header)
 173             + sizeof(struct ltt_trace_header_1_0);
 174         tf->tsc_lsb_truncate = vheader->tsc_lsb_truncate;
 175         tf->tscbits = vheader->tscbits;
 176         tf->tsc_msb_cutoff = 32 - tf->tsc_lsb_truncate - tf->tscbits;
 177         tf->compact_event_bits = 32 - vheader->compact_data_shift;
 178         tf->tsc_mask = ((1ULL << (tf->tscbits))-1);
 179         tf->tsc_mask = tf->tsc_mask << tf->tsc_lsb_truncate;
 180         tf->tsc_mask_next_bit = (1ULL<<(tf->tscbits));
 181         tf->tsc_mask_next_bit = tf->tsc_mask_next_bit << tf->tsc_lsb_truncate;
 182         if(t) {
 183           t->start_freq = ltt_get_uint64(LTT_GET_BO(tf),
 184                                          &vheader->start_freq);
 185           t->freq_scale = ltt_get_uint32(LTT_GET_BO(tf),
 186                                          &vheader->freq_scale);
 187           if(father_trace) {
 188             t->start_freq = father_trace->start_freq;
 189             t->freq_scale = father_trace->freq_scale;
 190           }
 191           else {
 192             father_trace = t;
 193           }
 194           t->start_tsc = ltt_get_uint64(LTT_GET_BO(tf),
 195                                         &vheader->start_tsc);
 196           t->start_monotonic = ltt_get_uint64(LTT_GET_BO(tf),
 197                                               &vheader->start_monotonic);
 198           t->start_time.tv_sec = ltt_get_uint64(LTT_GET_BO(tf),
 199                                        &vheader->start_time_sec);
 200           t->start_time.tv_nsec = ltt_get_uint64(LTT_GET_BO(tf),
 201                                        &vheader->start_time_usec);
 202           t->start_time.tv_nsec *= 1000; /* microsec to nanosec */
 203
 204           t->start_time_from_tsc = ltt_time_from_uint64(
 205               (double)t->start_tsc
 206               * (1000000000.0 / tf->trace->freq_scale)
 207               / (double)t->start_freq);
 208         }
 209       }
 210       break;
 211     default:
 212       g_warning("Unsupported trace version : %hhu.%hhu",
 213               any->major_version, any->minor_version);
 214       return 1;
 215     }
 216     break;
 217   default:
 218     g_warning("Unsupported trace version : %hhu.%hhu",
 219             any->major_version, any->minor_version);
 220     return 1;
 221   }
 222
 223
 224   return 0;
 225 }
 226
 227
 228
 229 /*****************************************************************************
 230  *Function name
 231  *    ltt_tracefile_open : open a trace file, construct a LttTracefile
 232  *Input params
 233  *    t                  : the trace containing the tracefile
 234  *    fileName           : path name of the trace file
 235  *    tf                 : the tracefile structure
 236  *Return value
 237  *                       : 0 for success, -1 otherwise.
 238  ****************************************************************************/
 239
 240 static gint ltt_tracefile_open(LttTrace *t, gchar * fileName, LttTracefile *tf)
 241 {
 242   struct stat    lTDFStat;    /* Trace data file status */
 243   struct ltt_block_start_header *header;
 244   int page_size = getpagesize();
 245
 246   //open the file
 247   tf->long_name = g_quark_from_string(fileName);
 248   tf->trace = t;
 249   tf->fd = open(fileName, O_RDONLY);
 250   if(tf->fd < 0){
 251     g_warning("Unable to open input data file %s\n", fileName);
 252     goto end;
 253   }
 254
 255   // Get the file's status
 256   if(fstat(tf->fd, &lTDFStat) < 0){
 257     g_warning("Unable to get the status of the input data file %s\n", fileName);
 258     goto close_file;
 259   }
 260
 261   // Is the file large enough to contain a trace
 262   if(lTDFStat.st_size <
 263       (off_t)(sizeof(struct ltt_block_start_header)
 264                      + sizeof(struct ltt_trace_header_any))){
 265     g_print("The input data file %s does not contain a trace\n", fileName);
 266     goto close_file;
 267   }
 268
 269   /* Temporarily map the buffer start header to get trace information */
 270   /* Multiple of pages aligned head */
 271   tf->buffer.head = mmap(0,
 272       PAGE_ALIGN(sizeof(struct ltt_block_start_header)
 273           + sizeof(struct ltt_trace_header_any)), PROT_READ,
 274       MAP_PRIVATE, tf->fd, 0);
 275   if(tf->buffer.head == MAP_FAILED) {
 276     perror("Error in allocating memory for buffer of tracefile");
 277     goto close_file;
 278   }
 279   g_assert( ( (gulong)tf->buffer.head&(8-1) ) == 0); // make sure it's aligned.
 280
 281   header = (struct ltt_block_start_header*)tf->buffer.head;
 282
 283   if(parse_trace_header(header->trace, tf, NULL)) {
 284     g_warning("parse_trace_header error");
 285     goto unmap_file;
 286   }
 287
 288   //store the size of the file
 289   tf->file_size = lTDFStat.st_size;
 290   tf->buf_size = ltt_get_uint32(LTT_GET_BO(tf), &header->buf_size);
 291   tf->num_blocks = tf->file_size / tf->buf_size;
 292
 293   if(munmap(tf->buffer.head,
 294         PAGE_ALIGN(sizeof(struct ltt_block_start_header)
 295             + sizeof(struct ltt_trace_header_any)))) {
 296     g_warning("unmap size : %u\n",
 297         PAGE_ALIGN(sizeof(struct ltt_block_start_header)
 298             + sizeof(struct ltt_trace_header_any)));
 299     perror("munmap error");
 300     g_assert(0);
 301   }
 302   tf->buffer.head = NULL;
 303
 304   //read the first block
 305   if(map_block(tf,0)) {
 306     perror("Cannot map block for tracefile");
 307     goto close_file;
 308   }
 309
 310   return 0;
 311
 312   /* Error */
 313 unmap_file:
 314   if(munmap(tf->buffer.head,
 315         PAGE_ALIGN(sizeof(struct ltt_block_start_header)
 316             + sizeof(struct ltt_trace_header_any)))) {
 317     g_warning("unmap size : %u\n",
 318         PAGE_ALIGN(sizeof(struct ltt_block_start_header)
 319             + sizeof(struct ltt_trace_header_any)));
 320     perror("munmap error");
 321     g_assert(0);
 322   }
 323 close_file:
 324   close(tf->fd);
 325 end:
 326   return -1;
 327 }
 328
 329 #if 0
 330 /*****************************************************************************
 331  *Open control and per cpu tracefiles
 332  ****************************************************************************/
 333
 334 void ltt_tracefile_open_cpu(LttTrace *t, gchar * tracefile_name)
 335 {
 336   LttTracefile * tf;
 337   tf = ltt_tracefile_open(t,tracefile_name);
 338   if(!tf) return;
 339   t->per_cpu_tracefile_number++;
 340   g_ptr_array_add(t->per_cpu_tracefiles, tf);
 341 }
 342
 343 gint ltt_tracefile_open_control(LttTrace *t, gchar * control_name)
 344 {
 345   LttTracefile * tf;
 346   LttEvent ev;
 347   LttFacility * f;
 348   void * pos;
 349   FacilityLoad fLoad;
 350   unsigned int i;
 351
 352   tf = ltt_tracefile_open(t,control_name);
 353   if(!tf) {
 354           g_warning("ltt_tracefile_open_control : bad file descriptor");
 355     return -1;
 356   }
 357   t->control_tracefile_number++;
 358   g_ptr_array_add(t->control_tracefiles,tf);
 359
 360   //parse facilities tracefile to get base_id
 361   if(strcmp(&control_name[strlen(control_name)-10],"facilities") ==0){
 362     while(1){
 363       if(!ltt_tracefile_read(tf,&ev)) return 0; // end of file
 364
 365       if(ev.event_id == TRACE_FACILITY_LOAD){
 366         pos = ev.data;
 367         fLoad.name = (gchar*)pos;
 368         fLoad.checksum = *(LttChecksum*)(pos + strlen(fLoad.name));
 369         fLoad.base_code = *(guint32 *)(pos + strlen(fLoad.name) + sizeof(LttChecksum));
 370
 371         for(i=0;i<t->facility_number;i++){
 372           f = (LttFacility*)g_ptr_array_index(t->facilities,i);
 373           if(strcmp(f->name,fLoad.name)==0 && fLoad.checksum==f->checksum){
 374             f->base_id = fLoad.base_code;
 375             break;
 376           }
 377         }
 378         if(i==t->facility_number) {
 379           g_warning("Facility: %s, checksum: %u is not found",
 380                   fLoad.name,(unsigned int)fLoad.checksum);
 381     return -1;
 382   }
 383       }else if(ev.event_id == TRACE_BLOCK_START){
 384         continue;
 385       }else if(ev.event_id == TRACE_BLOCK_END){
 386         break;
 387       }else {
 388         g_warning("Not valid facilities trace file");
 389         return -1;
 390       }
 391     }
 392   }
 393   return 0;
 394 }
 395 #endif //0
 396
 397 /*****************************************************************************
 398  *Function name
 399  *    ltt_tracefile_close: close a trace file,
 400  *Input params
 401  *    t                  : tracefile which will be closed
 402  ****************************************************************************/
 403
 404 static void ltt_tracefile_close(LttTracefile *t)
 405 {
 406   int page_size = getpagesize();
 407
 408   if(t->buffer.head != NULL)
 409     if(munmap(t->buffer.head, PAGE_ALIGN(t->buf_size))) {
 410     g_warning("unmap size : %u\n",
 411         PAGE_ALIGN(t->buf_size));
 412     perror("munmap error");
 413     g_assert(0);
 414   }
 415
 416   close(t->fd);
 417 }
 418
 419
 420 /*****************************************************************************
 421  *Get system information
 422  ****************************************************************************/
 423 #if 0
 424 gint getSystemInfo(LttSystemDescription* des, gchar * pathname)
 425 {
 426   int fd;
 427   GIOChannel *iochan;
 428   gchar *buf = NULL;
 429   gsize length;
 430
 431   GMarkupParseContext * context;
 432   GError * error = NULL;
 433   GMarkupParser markup_parser =
 434     {
 435       parser_start_element,
 436       NULL,
 437       parser_characters,
 438       NULL,  /*  passthrough  */
 439       NULL   /*  error        */
 440     };
 441
 442   fd = g_open(pathname, O_RDONLY, 0);
 443   if(fd == -1){
 444     g_warning("Can not open file : %s\n", pathname);
 445     return -1;
 446   }
 447
 448   iochan = g_io_channel_unix_new(fd);
 449
 450   context = g_markup_parse_context_new(&markup_parser, 0, des,NULL);
 451
 452   //while(fgets(buf,DIR_NAME_SIZE, fp) != NULL){
 453   while(g_io_channel_read_line(iochan, &buf, &length, NULL, &error)
 454       != G_IO_STATUS_EOF) {
 455
 456     if(error != NULL) {
 457       g_warning("Can not read xml file: \n%s\n", error->message);
 458       g_error_free(error);
 459     }
 460     if(!g_markup_parse_context_parse(context, buf, length, &error)){
 461       if(error != NULL) {
 462         g_warning("Can not parse xml file: \n%s\n", error->message);
 463         g_error_free(error);
 464       }
 465       g_markup_parse_context_free(context);
 466
 467       g_io_channel_shutdown(iochan, FALSE, &error); /* No flush */
 468       if(error != NULL) {
 469         g_warning("Can not close file: \n%s\n", error->message);
 470         g_error_free(error);
 471       }
 472
 473       close(fd);
 474       return -1;
 475     }
 476   }
 477   g_markup_parse_context_free(context);
 478
 479   g_io_channel_shutdown(iochan, FALSE, &error); /* No flush */
 480   if(error != NULL) {
 481     g_warning("Can not close file: \n%s\n", error->message);
 482     g_error_free(error);
 483   }
 484
 485   g_close(fd);
 486
 487   g_free(buf);
 488   return 0;
 489 }
 490 #endif //0
 491
 492 /*****************************************************************************
 493  *The following functions get facility/tracefile information
 494  ****************************************************************************/
 495 #if 0
 496 gint getFacilityInfo(LttTrace *t, gchar* eventdefs)
 497 {
 498   GDir * dir;
 499   const gchar * name;
 500   unsigned int i,j;
 501   LttFacility * f;
 502   LttEventType * et;
 503   gchar fullname[DIR_NAME_SIZE];
 504   GError * error = NULL;
 505
 506   dir = g_dir_open(eventdefs, 0, &error);
 507
 508   if(error != NULL) {
 509     g_warning("Can not open directory: %s, %s\n", eventdefs, error->message);
 510     g_error_free(error);
 511     return -1;
 512   }
 513
 514   while((name = g_dir_read_name(dir)) != NULL){
 515     if(!g_pattern_match_simple("*.xml", name)) continue;
 516     strcpy(fullname,eventdefs);
 517     strcat(fullname,name);
 518     ltt_facility_open(t,fullname);
 519   }
 520   g_dir_close(dir);
 521
 522   for(j=0;j<t->facility_number;j++){
 523     f = (LttFacility*)g_ptr_array_index(t->facilities, j);
 524     for(i=0; i<f->event_number; i++){
 525       et = f->events[i];
 526       setFieldsOffset(NULL, et, NULL, t);
 527     }
 528   }
 529   return 0;
 530 }
 531 #endif //0
 532
 533 /*****************************************************************************
 534  *A trace is specified as a pathname to the directory containing all the
 535  *associated data (control tracefiles, per cpu tracefiles, event
 536  *descriptions...).
 537  *
 538  *When a trace is closed, all the associated facilities, types and fields
 539  *are released as well.
 540  */
 541
 542
 543 /****************************************************************************
 544  * get_absolute_pathname
 545  *
 546  * return the unique pathname in the system
 547  *
 548  * MD : Fixed this function so it uses realpath, dealing well with
 549  * forgotten cases (.. were not used correctly before).
 550  *
 551  ****************************************************************************/
 552 void get_absolute_pathname(const gchar *pathname, gchar * abs_pathname)
 553 {
 554   abs_pathname[0] = '\0';
 555
 556   if ( realpath (pathname, abs_pathname) != NULL)
 557     return;
 558   else
 559   {
 560     /* error, return the original path unmodified */
 561     strcpy(abs_pathname, pathname);
 562     return;
 563   }
 564   return;
 565 }
 566
 567 /* Search for something like : .*_.*
 568  *
 569  * The left side is the name, the right side is the number.
 570  */
 571
 572 static int get_tracefile_name_number(gchar *raw_name,
 573                               GQuark *name,
 574                               guint *num,
 575                               gulong *tid,
 576                               gulong *pgid,
 577                               guint64 *creation)
 578 {
 579   guint raw_name_len = strlen(raw_name);
 580   gchar char_name[PATH_MAX];
 581   int i;
 582   int underscore_pos;
 583   long int cpu_num;
 584   gchar *endptr;
 585   gchar *tmpptr;
 586
 587   for(i=raw_name_len-1;i>=0;i--) {
 588     if(raw_name[i] == '_') break;
 589   }
 590   if(i==-1) { /* Either not found or name length is 0 */
 591     /* This is a userspace tracefile */
 592     strncpy(char_name, raw_name, raw_name_len);
 593     char_name[raw_name_len] = '\0';
 594     *name = g_quark_from_string(char_name);
 595     *num = 0;  /* unknown cpu */
 596     for(i=0;i<raw_name_len;i++) {
 597       if(raw_name[i] == '/') {
 598         break;
 599       }
 600     }
 601     i++;
 602     for(;i<raw_name_len;i++) {
 603       if(raw_name[i] == '/') {
 604         break;
 605       }
 606     }
 607     i++;
 608     for(;i<raw_name_len;i++) {
 609       if(raw_name[i] == '-') {
 610         break;
 611       }
 612     }
 613     if(i == raw_name_len) return -1;
 614     i++;
 615     tmpptr = &raw_name[i];
 616     for(;i<raw_name_len;i++) {
 617       if(raw_name[i] == '.') {
 618         raw_name[i] = ' ';
 619         break;
 620       }
 621     }
 622     *tid = strtoul(tmpptr, &endptr, 10);
 623     if(endptr == tmpptr)
 624       return -1; /* No digit */
 625     if(*tid == ULONG_MAX)
 626       return -1; /* underflow / overflow */
 627     i++;
 628     tmpptr = &raw_name[i];
 629     for(;i<raw_name_len;i++) {
 630       if(raw_name[i] == '.') {
 631         raw_name[i] = ' ';
 632         break;
 633       }
 634     }
 635     *pgid = strtoul(tmpptr, &endptr, 10);
 636     if(endptr == tmpptr)
 637       return -1; /* No digit */
 638     if(*pgid == ULONG_MAX)
 639       return -1; /* underflow / overflow */
 640     i++;
 641     tmpptr = &raw_name[i];
 642     *creation = strtoull(tmpptr, &endptr, 10);
 643     if(endptr == tmpptr)
 644       return -1; /* No digit */
 645     if(*creation == G_MAXUINT64)
 646       return -1; /* underflow / overflow */
 647   } else {
 648     underscore_pos = i;
 649
 650     cpu_num = strtol(raw_name+underscore_pos+1, &endptr, 10);
 651
 652     if(endptr == raw_name+underscore_pos+1)
 653       return -1; /* No digit */
 654     if(cpu_num == LONG_MIN || cpu_num == LONG_MAX)
 655       return -1; /* underflow / overflow */
 656
 657     strncpy(char_name, raw_name, underscore_pos);
 658     char_name[underscore_pos] = '\0';
 659
 660     *name = g_quark_from_string(char_name);
 661     *num = cpu_num;
 662   }
 663
 664
 665   return 0;
 666 }
 667
 668
 669 GData **ltt_trace_get_tracefiles_groups(LttTrace *trace)
 670 {
 671   return &trace->tracefiles;
 672 }
 673
 674
 675 void compute_tracefile_group(GQuark key_id,
 676                              GArray *group,
 677                              struct compute_tracefile_group_args *args)
 678 {
 679   int i;
 680   LttTracefile *tf;
 681
 682   for(i=0; i<group->len; i++) {
 683     tf = &g_array_index (group, LttTracefile, i);
 684     if(tf->cpu_online)
 685       args->func(tf, args->func_args);
 686   }
 687 }
 688
 689
 690 static void ltt_tracefile_group_destroy(gpointer data)
 691 {
 692   GArray *group = (GArray *)data;
 693   int i;
 694   LttTracefile *tf;
 695
 696   for(i=0; i<group->len; i++) {
 697     tf = &g_array_index (group, LttTracefile, i);
 698     if(tf->cpu_online)
 699       ltt_tracefile_close(tf);
 700   }
 701   g_array_free(group, TRUE);
 702 }
 703
 704 static gboolean ltt_tracefile_group_has_cpu_online(gpointer data)
 705 {
 706   GArray *group = (GArray *)data;
 707   int i;
 708   LttTracefile *tf;
 709
 710   for(i=0; i<group->len; i++) {
 711     tf = &g_array_index (group, LttTracefile, i);
 712     if(tf->cpu_online)
 713       return 1;
 714   }
 715   return 0;
 716 }
 717
 718
 719 /* Open each tracefile under a specific directory. Put them in a
 720  * GData : permits to access them using their tracefile group pathname.
 721  * i.e. access control/modules tracefile group by index :
 722  * "control/module".
 723  *
 724  * relative path is the path relative to the trace root
 725  * root path is the full path
 726  *
 727  * A tracefile group is simply an array where all the per cpu tracefiles sit.
 728  */
 729
 730 static int open_tracefiles(LttTrace *trace, gchar *root_path, gchar *relative_path)
 731 {
 732   DIR *dir = opendir(root_path);
 733   struct dirent *entry;
 734   struct stat stat_buf;
 735   int ret;
 736
 737   gchar path[PATH_MAX];
 738   int path_len;
 739   gchar *path_ptr;
 740
 741   int rel_path_len;
 742   gchar rel_path[PATH_MAX];
 743   gchar *rel_path_ptr;
 744   LttTracefile tmp_tf;
 745
 746   if(dir == NULL) {
 747     perror(root_path);
 748     return ENOENT;
 749   }
 750
 751   strncpy(path, root_path, PATH_MAX-1);
 752   path_len = strlen(path);
 753   path[path_len] = '/';
 754   path_len++;
 755   path_ptr = path + path_len;
 756
 757   strncpy(rel_path, relative_path, PATH_MAX-1);
 758   rel_path_len = strlen(rel_path);
 759   rel_path[rel_path_len] = '/';
 760   rel_path_len++;
 761   rel_path_ptr = rel_path + rel_path_len;
 762
 763   while((entry = readdir(dir)) != NULL) {
 764
 765     if(entry->d_name[0] == '.') continue;
 766
 767     strncpy(path_ptr, entry->d_name, PATH_MAX - path_len);
 768     strncpy(rel_path_ptr, entry->d_name, PATH_MAX - rel_path_len);
 769
 770     ret = stat(path, &stat_buf);
 771     if(ret == -1) {
 772       perror(path);
 773       continue;
 774     }
 775
 776     g_debug("Tracefile file or directory : %s\n", path);
 777
 778   //  if(strcmp(rel_path, "/eventdefs") == 0) continue;
 779
 780     if(S_ISDIR(stat_buf.st_mode)) {
 781
 782       g_debug("Entering subdirectory...\n");
 783       ret = open_tracefiles(trace, path, rel_path);
 784       if(ret < 0) continue;
 785     } else if(S_ISREG(stat_buf.st_mode)) {
 786       GQuark name;
 787       guint num;
 788       gulong tid, pgid;
 789       guint64 creation;
 790       GArray *group;
 791       num = 0;
 792       tid = pgid = 0;
 793       creation = 0;
 794       if(get_tracefile_name_number(rel_path, &name, &num, &tid, &pgid, &creation))
 795         continue; /* invalid name */
 796
 797       g_debug("Opening file.\n");
 798       if(ltt_tracefile_open(trace, path, &tmp_tf)) {
 799         g_info("Error opening tracefile %s", path);
 800
 801         continue; /* error opening the tracefile : bad magic number ? */
 802       }
 803
 804       g_debug("Tracefile name is %s and number is %u",
 805           g_quark_to_string(name), num);
 806
 807       tmp_tf.cpu_online = 1;
 808       tmp_tf.cpu_num = num;
 809       tmp_tf.name = name;
 810       tmp_tf.tid = tid;
 811       tmp_tf.pgid = pgid;
 812       tmp_tf.creation = creation;
 813       if(tmp_tf.name == g_quark_from_string("/compact")
 814         || tmp_tf.name == g_quark_from_string("/flight-compact"))
 815         tmp_tf.compact = 1;
 816       else
 817         tmp_tf.compact = 0;
 818       group = g_datalist_id_get_data(&trace->tracefiles, name);
 819       if(group == NULL) {
 820         /* Elements are automatically cleared when the array is allocated.
 821          * It makes the cpu_online variable set to 0 : cpu offline, by default.
 822          */
 823         group = g_array_sized_new (FALSE, TRUE, sizeof(LttTracefile), 10);
 824         g_datalist_id_set_data_full(&trace->tracefiles, name,
 825                                  group, ltt_tracefile_group_destroy);
 826       }
 827
 828       /* Add the per cpu tracefile to the named group */
 829       unsigned int old_len = group->len;
 830       if(num+1 > old_len)
 831         group = g_array_set_size(group, num+1);
 832       g_array_index (group, LttTracefile, num) = tmp_tf;
 833       g_array_index (group, LttTracefile, num).event.tracefile =
 834         &g_array_index (group, LttTracefile, num);
 835     }
 836   }
 837
 838   closedir(dir);
 839
 840   return 0;
 841 }
 842
 843
 844 /* Presumes the tracefile is already seeked at the beginning. It makes sense,
 845  * because it must be done just after the opening */
 846 static int ltt_process_facility_tracefile(LttTracefile *tf)
 847 {
 848   int err;
 849   //LttFacility *fac;
 850   //GArray *fac_ids;
 851   guint i;
 852   //LttEventType *et;
 853
 854   while(1) {
 855     err = ltt_tracefile_read_seek(tf);
 856     if(err == EPERM) goto seek_error;
 857     else if(err == ERANGE) break; /* End of tracefile */
 858
 859     err = ltt_tracefile_read_update_event(tf);
 860     if(err) goto update_error;
 861
 862     /* We are on a facility load/or facility unload/ or heartbeat event */
 863     /* The rules are :
 864      * * facility 0 is hardcoded : this is the core facility. It will be shown
 865      *   in the facility array though, and is shown as "loaded builtin" in the
 866      *   trace.
 867      * It contains event :
 868      *  0 : facility load
 869      *  1 : facility unload
 870      *  2 : state dump facility load
 871      *  3 : heartbeat
 872      */
 873     if(tf->event.event_id >= MARKER_CORE_IDS) {
 874       /* Should only contain core facility */
 875       g_warning("Error in processing facility file %s, "
 876           "should not contain event id %u.", g_quark_to_string(tf->name),
 877           tf->event.event_id);
 878       err = EPERM;
 879       goto event_id_error;
 880     } else {
 881
 882       char *pos;
 883       const char *marker_name, *format;
 884       uint16_t id;
 885       guint8 int_size, long_size, pointer_size, size_t_size, alignment;
 886
 887       // FIXME align
 888       switch((enum marker_id)tf->event.event_id) {
 889         case MARKER_ID_SET_MARKER_ID:
 890           marker_name = pos = tf->event.data;
 891           g_debug("Doing MARKER_ID_SET_MARKER_ID of marker %s", marker_name);
 892           pos += strlen(marker_name) + 1;
 893           //remove genevent compatibility
 894           //pos += ltt_align((size_t)pos, tf->trace->arch_size, tf->alignment);
 895           pos += ltt_align((size_t)pos, sizeof(uint16_t), tf->alignment);
 896           id = ltt_get_uint16(LTT_GET_BO(tf), pos);
 897           g_debug("In MARKER_ID_SET_MARKER_ID of marker %s id %hu",
 898                 marker_name, id);
 899           pos += sizeof(guint16);
 900           int_size = *(guint8*)pos;
 901           pos += sizeof(guint8);
 902           long_size = *(guint8*)pos;
 903           pos += sizeof(guint8);
 904           pointer_size = *(guint8*)pos;
 905           pos += sizeof(guint8);
 906           size_t_size = *(guint8*)pos;
 907           pos += sizeof(guint8);
 908           alignment = *(guint8*)pos;
 909           pos += sizeof(guint8);
 910           marker_id_event(tf->trace, g_quark_from_string(marker_name),
 911                           id, int_size, long_size,
 912                           pointer_size, size_t_size, alignment);
 913           break;
 914         case MARKER_ID_SET_MARKER_FORMAT:
 915           marker_name = pos = tf->event.data;
 916           g_debug("Doing MARKER_ID_SET_MARKER_FORMAT of marker %s",
 917                   marker_name);
 918           pos += strlen(marker_name) + 1;
 919           //break genevent.
 920           //pos += ltt_align((size_t)pos, tf->trace->arch_size, tf->alignment);
 921           format = pos;
 922           pos += strlen(format) + 1;
 923           //break genevent
 924           //pos += ltt_align((size_t)pos, tf->trace->arch_size, tf->alignment);
 925           marker_format_event(tf->trace, g_quark_from_string(marker_name),
 926                               format);
 927           /* get information from dictionnary TODO */
 928           break;
 929         case MARKER_ID_HEARTBEAT_32:
 930         case MARKER_ID_HEARTBEAT_64:
 931           break;
 932         default:
 933           g_warning("Error in processing facility file %s, "
 934               "unknown event id %hhu.",
 935               g_quark_to_string(tf->name),
 936               tf->event.event_id);
 937           err = EPERM;
 938           goto event_id_error;
 939       }
 940     }
 941   }
 942   return 0;
 943
 944   /* Error handling */
 945 event_id_error:
 946 update_error:
 947 seek_error:
 948   g_warning("An error occured in facility tracefile parsing");
 949   return err;
 950 }
 951
 952 /*
 953  * Open a trace and return its LttTrace handle.
 954  *
 955  * pathname must be the directory of the trace
 956  */
 957
 958 LttTrace *ltt_trace_open(const gchar *pathname)
 959 {
 960   gchar abs_path[PATH_MAX];
 961   LttTrace  * t;
 962   LttTracefile *tf;
 963   GArray *group;
 964   int i, ret;
 965   struct ltt_block_start_header *header;
 966   DIR *dir;
 967   struct dirent *entry;
 968   guint control_found = 0;
 969   struct stat stat_buf;
 970   gchar path[PATH_MAX];
 971
 972   t = g_new(LttTrace, 1);
 973   if(!t) goto alloc_error;
 974
 975   get_absolute_pathname(pathname, abs_path);
 976   t->pathname = g_quark_from_string(abs_path);
 977
 978   g_datalist_init(&t->tracefiles);
 979
 980   /* Test to see if it looks like a trace */
 981   dir = opendir(abs_path);
 982   if(dir == NULL) {
 983     perror(abs_path);
 984     goto open_error;
 985   }
 986   while((entry = readdir(dir)) != NULL) {
 987     strcpy(path, abs_path);
 988     strcat(path, "/");
 989     strcat(path, entry->d_name);
 990     ret = stat(path, &stat_buf);
 991     if(ret == -1) {
 992       perror(path);
 993       continue;
 994     }
 995     if(S_ISDIR(stat_buf.st_mode)) {
 996       if(strcmp(entry->d_name, "control") == 0) {
 997         control_found = 1;
 998       }
 999     }
1000   }
1001   closedir(dir);
1002
1003   if(!control_found) goto find_error;
1004
1005   /* Open all the tracefiles */
1006   if(open_tracefiles(t, abs_path, "")) {
1007     g_warning("Error opening tracefile %s", abs_path);
1008     goto find_error;
1009   }
1010
1011   /* Parse each trace control/facilitiesN files : get runtime fac. info */
1012   group = g_datalist_id_get_data(&t->tracefiles, LTT_TRACEFILE_NAME_FACILITIES);
1013   if(group == NULL) {
1014     g_error("Trace %s has no facility tracefile", abs_path);
1015     g_assert(0);
1016     goto facilities_error;
1017   }
1018
1019   /* Get the trace information for the control/facility 0 tracefile */
1020   g_assert(group->len > 0);
1021   tf = &g_array_index (group, LttTracefile, 0);
1022   header = (struct ltt_block_start_header*)tf->buffer.head;
1023   g_assert(parse_trace_header(header->trace,
1024                                   tf, t) == 0);
1025
1026   t->num_cpu = group->len;
1027
1028   ret = allocate_marker_data(t);
1029   if (ret)
1030     g_error("Error in allocating marker data");
1031
1032   for(i=0; i<group->len; i++) {
1033     tf = &g_array_index (group, LttTracefile, i);
1034     if(ltt_process_facility_tracefile(tf))
1035       goto facilities_error;
1036   }
1037
1038   return t;
1039
1040   /* Error handling */
1041 facilities_error:
1042   destroy_marker_data(t);
1043 find_error:
1044   g_datalist_clear(&t->tracefiles);
1045 open_error:
1046   g_free(t);
1047 alloc_error:
1048   return NULL;
1049
1050 }
1051
1052 /* Open another, completely independant, instance of a trace.
1053  *
1054  * A read on this new instance will read the first event of the trace.
1055  *
1056  * When we copy a trace, we want all the opening actions to happen again :
1057  * the trace will be reopened and totally independant from the original.
1058  * That's why we call ltt_trace_open.
1059  */
1060 LttTrace *ltt_trace_copy(LttTrace *self)
1061 {
1062   return ltt_trace_open(g_quark_to_string(self->pathname));
1063 }
1064
1065 /*
1066  * Close a trace
1067  */
1068
1069 void ltt_trace_close(LttTrace *t)
1070 {
1071   g_datalist_clear(&t->tracefiles);
1072   g_free(t);
1073 }
1074
1075
1076 /*****************************************************************************
1077  * Get the start time and end time of the trace
1078  ****************************************************************************/
1079
1080 void ltt_tracefile_time_span_get(LttTracefile *tf,
1081                                         LttTime *start, LttTime *end)
1082 {
1083   int err;
1084
1085   err = map_block(tf, 0);
1086   if(unlikely(err)) {
1087     g_error("Can not map block");
1088     *start = ltt_time_infinite;
1089   } else
1090     *start = tf->buffer.begin.timestamp;
1091
1092   err = map_block(tf, tf->num_blocks - 1);  /* Last block */
1093   if(unlikely(err)) {
1094     g_error("Can not map block");
1095     *end = ltt_time_zero;
1096   } else
1097     *end = tf->buffer.end.timestamp;
1098 }
1099
1100 struct tracefile_time_span_get_args {
1101   LttTrace *t;
1102   LttTime *start;
1103   LttTime *end;
1104 };
1105
1106 static void group_time_span_get(GQuark name, gpointer data, gpointer user_data)
1107 {
1108   struct tracefile_time_span_get_args *args =
1109           (struct tracefile_time_span_get_args*)user_data;
1110
1111   GArray *group = (GArray *)data;
1112   int i;
1113   LttTracefile *tf;
1114   LttTime tmp_start;
1115   LttTime tmp_end;
1116
1117   for(i=0; i<group->len; i++) {
1118     tf = &g_array_index (group, LttTracefile, i);
1119     if(tf->cpu_online) {
1120       ltt_tracefile_time_span_get(tf, &tmp_start, &tmp_end);
1121       if(ltt_time_compare(*args->start, tmp_start)>0) *args->start = tmp_start;
1122       if(ltt_time_compare(*args->end, tmp_end)<0) *args->end = tmp_end;
1123     }
1124   }
1125 }
1126
1127 /* return the start and end time of a trace */
1128
1129 void ltt_trace_time_span_get(LttTrace *t, LttTime *start, LttTime *end)
1130 {
1131   LttTime min_start = ltt_time_infinite;
1132   LttTime max_end = ltt_time_zero;
1133   struct tracefile_time_span_get_args args = { t, &min_start, &max_end };
1134
1135   g_datalist_foreach(&t->tracefiles, &group_time_span_get, &args);
1136
1137   if(start != NULL) *start = min_start;
1138   if(end != NULL) *end = max_end;
1139
1140 }
1141
1142
1143 /* Seek to the first event in a tracefile that has a time equal or greater than
1144  * the time passed in parameter.
1145  *
1146  * If the time parameter is outside the tracefile time span, seek to the first
1147  * event or if after, return ERANGE.
1148  *
1149  * If the time parameter is before the first event, we have to seek specially to
1150  * there.
1151  *
1152  * If the time is after the end of the trace, return ERANGE.
1153  *
1154  * Do a binary search to find the right block, then a sequential search in the
1155  * block to find the event.
1156  *
1157  * In the special case where the time requested fits inside a block that has no
1158  * event corresponding to the requested time, the first event of the next block
1159  * will be seeked.
1160  *
1161  * IMPORTANT NOTE : // FIXME everywhere...
1162  *
1163  * You MUST NOT do a ltt_tracefile_read right after a ltt_tracefile_seek_time :
1164  * you will jump over an event if you do.
1165  *
1166  * Return value : 0 : no error, the tf->event can be used
1167  *                ERANGE : time if after the last event of the trace
1168  *                otherwise : this is an error.
1169  *
1170  * */
1171
1172 int ltt_tracefile_seek_time(LttTracefile *tf, LttTime time)
1173 {
1174   int ret = 0;
1175   int err;
1176   unsigned int block_num, high, low;
1177
1178   /* seek at the beginning of trace */
1179   err = map_block(tf, 0);  /* First block */
1180   if(unlikely(err)) {
1181     g_error("Can not map block");
1182     goto fail;
1183   }
1184
1185  /* If the time is lower or equal the beginning of the trace,
1186   * go to the first event. */
1187   if(ltt_time_compare(time, tf->buffer.begin.timestamp) <= 0) {
1188     ret = ltt_tracefile_read(tf);
1189     if(ret == ERANGE) goto range;
1190     else if (ret) goto fail;
1191     goto found; /* There is either no event in the trace or the event points
1192                    to the first event in the trace */
1193   }
1194
1195   err = map_block(tf, tf->num_blocks - 1);  /* Last block */
1196   if(unlikely(err)) {
1197     g_error("Can not map block");
1198     goto fail;
1199   }
1200
1201  /* If the time is after the end of the trace, return ERANGE. */
1202   if(ltt_time_compare(time, tf->buffer.end.timestamp) > 0) {
1203     goto range;
1204   }
1205
1206   /* Binary search the block */
1207   high = tf->num_blocks - 1;
1208   low = 0;
1209
1210   while(1) {
1211     block_num = ((high-low) / 2) + low;
1212
1213     err = map_block(tf, block_num);
1214     if(unlikely(err)) {
1215       g_error("Can not map block");
1216       goto fail;
1217     }
1218     if(high == low) {
1219       /* We cannot divide anymore : this is what would happen if the time
1220        * requested was exactly between two consecutive buffers'end and start
1221        * timestamps. This is also what would happend if we didn't deal with out
1222        * of span cases prior in this function. */
1223       /* The event is right in the buffer!
1224        * (or in the next buffer first event) */
1225       while(1) {
1226         ret = ltt_tracefile_read(tf);
1227         if(ret == ERANGE) goto range; /* ERANGE or EPERM */
1228         else if(ret) goto fail;
1229
1230         if(ltt_time_compare(time, tf->event.event_time) <= 0)
1231           goto found;
1232       }
1233
1234     } else if(ltt_time_compare(time, tf->buffer.begin.timestamp) < 0) {
1235       /* go to lower part */
1236       high = block_num - 1;
1237     } else if(ltt_time_compare(time, tf->buffer.end.timestamp) > 0) {
1238       /* go to higher part */
1239       low = block_num + 1;
1240     } else {/* The event is right in the buffer!
1241                (or in the next buffer first event) */
1242       while(1) {
1243         ret = ltt_tracefile_read(tf);
1244         if(ret == ERANGE) goto range; /* ERANGE or EPERM */
1245         else if(ret) goto fail;
1246
1247         if(ltt_time_compare(time, tf->event.event_time) <= 0)
1248           break;
1249       }
1250       goto found;
1251     }
1252   }
1253
1254 found:
1255   return 0;
1256 range:
1257   return ERANGE;
1258
1259   /* Error handling */
1260 fail:
1261   g_error("ltt_tracefile_seek_time failed on tracefile %s",
1262       g_quark_to_string(tf->name));
1263   return EPERM;
1264 }
1265
1266 /* Seek to a position indicated by an LttEventPosition
1267  */
1268
1269 int ltt_tracefile_seek_position(LttTracefile *tf, const LttEventPosition *ep)
1270 {
1271   int err;
1272
1273   if(ep->tracefile != tf) {
1274     goto fail;
1275   }
1276
1277   err = map_block(tf, ep->block);
1278   if(unlikely(err)) {
1279     g_error("Can not map block");
1280     goto fail;
1281   }
1282
1283   tf->event.offset = ep->offset;
1284
1285   /* Put back the event real tsc */
1286   tf->event.tsc = ep->tsc;
1287   tf->buffer.tsc = ep->tsc;
1288
1289   err = ltt_tracefile_read_update_event(tf);
1290   if(err) goto fail;
1291   err = ltt_tracefile_read_op(tf);
1292   if(err) goto fail;
1293
1294   return 0;
1295
1296 fail:
1297   g_error("ltt_tracefile_seek_time failed on tracefile %s",
1298       g_quark_to_string(tf->name));
1299   return 1;
1300 }
1301
1302 /* Given a TSC value, return the LttTime (seconds,nanoseconds) it
1303  * corresponds to.
1304  */
1305
1306 LttTime ltt_interpolate_time_from_tsc(LttTracefile *tf, guint64 tsc)
1307 {
1308   LttTime time;
1309
1310   if(tsc > tf->trace->start_tsc) {
1311     time = ltt_time_from_uint64(
1312         (double)(tsc - tf->trace->start_tsc)
1313                                     * (1000000000.0 / tf->trace->freq_scale)
1314                                     / (double)tf->trace->start_freq);
1315     time = ltt_time_add(tf->trace->start_time_from_tsc, time);
1316   } else {
1317     time = ltt_time_from_uint64(
1318         (double)(tf->trace->start_tsc - tsc)
1319                                     * (1000000000.0 / tf->trace->freq_scale)
1320                                     / (double)tf->trace->start_freq);
1321     time = ltt_time_sub(tf->trace->start_time_from_tsc, time);
1322   }
1323   return time;
1324 }
1325
1326 /* Calculate the real event time based on the buffer boundaries */
1327 LttTime ltt_interpolate_time(LttTracefile *tf, LttEvent *event)
1328 {
1329   return ltt_interpolate_time_from_tsc(tf, tf->buffer.tsc);
1330 }
1331
1332
1333 /* Get the current event of the tracefile : valid until the next read */
1334 LttEvent *ltt_tracefile_get_event(LttTracefile *tf)
1335 {
1336   return &tf->event;
1337 }
1338
1339
1340
1341 /*****************************************************************************
1342  *Function name
1343  *    ltt_tracefile_read : Read the next event in the tracefile
1344  *Input params
1345  *    t                  : tracefile
1346  *Return value
1347  *
1348  *    Returns 0 if an event can be used in tf->event.
1349  *    Returns ERANGE on end of trace. The event in tf->event still can be used
1350  *    (if the last block was not empty).
1351  *    Returns EPERM on error.
1352  *
1353  *    This function does make the tracefile event structure point to the event
1354  *    currently pointed to by the tf->event.
1355  *
1356  *    Note : you must call a ltt_tracefile_seek to the beginning of the trace to
1357  *    reinitialize it after an error if you want results to be coherent.
1358  *    It would be the case if a end of trace last buffer has no event : the end
1359  *    of trace wouldn't be returned, but an error.
1360  *    We make the assumption there is at least one event per buffer.
1361  ****************************************************************************/
1362
1363 int ltt_tracefile_read(LttTracefile *tf)
1364 {
1365   int err;
1366
1367   err = ltt_tracefile_read_seek(tf);
1368   if(err) return err;
1369   err = ltt_tracefile_read_update_event(tf);
1370   if(err) return err;
1371   err = ltt_tracefile_read_op(tf);
1372   if(err) return err;
1373
1374   return 0;
1375 }
1376
1377 int ltt_tracefile_read_seek(LttTracefile *tf)
1378 {
1379   int err;
1380
1381   /* Get next buffer until we finally have an event, or end of trace */
1382   while(1) {
1383     err = ltt_seek_next_event(tf);
1384     if(unlikely(err == ENOPROTOOPT)) {
1385       return EPERM;
1386     }
1387
1388     /* Are we at the end of the buffer ? */
1389     if(err == ERANGE) {
1390       if(unlikely(tf->buffer.index == tf->num_blocks-1)){ /* end of trace ? */
1391         return ERANGE;
1392       } else {
1393         /* get next block */
1394         err = map_block(tf, tf->buffer.index + 1);
1395         if(unlikely(err)) {
1396           g_error("Can not map block");
1397           return EPERM;
1398         }
1399       }
1400     } else break; /* We found an event ! */
1401   }
1402
1403   return 0;
1404 }
1405
1406 /* do an operation when reading a new event */
1407
1408 /* do specific operation on events */
1409 int ltt_tracefile_read_op(LttTracefile *tf)
1410 {
1411   LttEvent *event;
1412
1413   event = &tf->event;
1414
1415    /* do event specific operation */
1416
1417   /* do something if its an heartbeat event : increment the heartbeat count */
1418   //if(event->facility_id == LTT_FACILITY_CORE)
1419   //  if(event->event_id == LTT_EVENT_HEARTBEAT)
1420   //    tf->cur_heart_beat_number++;
1421
1422   return 0;
1423 }
1424
1425 static void print_debug_event_header(LttEvent *ev, void *start_pos, void *end_pos)
1426 {
1427   unsigned int offset = 0;
1428   int i, j;
1429
1430   g_printf("Event header (tracefile %s offset %llx):\n",
1431     g_quark_to_string(ev->tracefile->long_name),
1432     ((uint64_t)ev->tracefile->buffer.index * ev->tracefile->buf_size)
1433       + (long)start_pos - (long)ev->tracefile->buffer.head);
1434
1435   while (offset < (long)end_pos - (long)start_pos) {
1436     g_printf("%8lx", (long)start_pos - (long)ev->tracefile->buffer.head + offset);
1437     g_printf("    ");
1438
1439     for (i = 0; i < 4 ; i++) {
1440       for (j = 0; j < 4; j++) {
1441         if (offset + ((i * 4) + j) <
1442                 (long)end_pos - (long)start_pos)
1443           g_printf("%02hhX",
1444             ((char*)start_pos)[offset + ((i * 4) + j)]);
1445         else
1446           g_printf("  ");
1447         g_printf(" ");
1448       }
1449       if (i < 4)
1450       g_printf(" ");
1451     }
1452     offset+=16;
1453     g_printf("\n");
1454   }
1455 }
1456
1457
1458 /* same as ltt_tracefile_read, but does not seek to the next event nor call
1459  * event specific operation. */
1460 int ltt_tracefile_read_update_event(LttTracefile *tf)
1461 {
1462   void * pos;
1463   LttEvent *event;
1464   void *pos_aligned;
1465
1466   event = &tf->event;
1467   pos = tf->buffer.head + event->offset;
1468
1469   /* Read event header */
1470
1471   /* Align the head */
1472   if(!tf->compact)
1473     pos += ltt_align((size_t)pos, tf->trace->arch_size, tf->alignment);
1474   else {
1475     g_assert(tf->has_heartbeat);
1476     pos += ltt_align((size_t)pos, sizeof(uint32_t), tf->alignment);
1477   }
1478   pos_aligned = pos;
1479
1480   if(tf->has_heartbeat) {
1481     event->timestamp = ltt_get_uint32(LTT_GET_BO(tf),
1482                                           pos);
1483     if(!tf->compact) {
1484       /* 32 bits -> 64 bits tsc */
1485       /* note : still works for seek and non seek cases. */
1486       if(event->timestamp < (0xFFFFFFFFULL&tf->buffer.tsc)) {
1487         tf->buffer.tsc = ((tf->buffer.tsc&0xFFFFFFFF00000000ULL)
1488                             + 0x100000000ULL)
1489                                 | (guint64)event->timestamp;
1490         event->tsc = tf->buffer.tsc;
1491       } else {
1492         /* no overflow */
1493         tf->buffer.tsc = (tf->buffer.tsc&0xFFFFFFFF00000000ULL)
1494                                 | (guint64)event->timestamp;
1495         event->tsc = tf->buffer.tsc;
1496         event->compact_data = 0;
1497       }
1498     } else {
1499       /* Compact header */
1500       /* We keep the LSB of the previous timestamp, to make sure
1501        * we never go back */
1502       event->event_id = event->timestamp >> tf->tscbits;
1503       event->event_id = event->event_id & ((1 << tf->compact_event_bits) - 1);
1504       event->compact_data = event->timestamp >>
1505         (tf->compact_event_bits + tf->tscbits);
1506       //printf("tsc bits %u, ev bits %u init data %u\n",
1507       //  tf->tscbits, tf->trace->compact_event_bits, event->compact_data);
1508       /* Put the compact data back in original endianness */
1509       event->compact_data = ltt_get_uint32(LTT_GET_BO(tf), &event->compact_data);
1510       event->event_size = 0xFFFF;
1511       //printf("Found compact event %d\n", event->event_id);
1512       //printf("Compact data %d\n", event->compact_data);
1513       event->timestamp = event->timestamp << tf->tsc_lsb_truncate;
1514       event->timestamp = event->timestamp & tf->tsc_mask;
1515       //printf("timestamp 0x%lX\n", event->timestamp);
1516       //printf("mask 0x%llX\n", tf->tsc_mask);
1517       //printf("mask_next 0x%llX\n", tf->tsc_mask_next_bit);
1518       //printf("previous tsc 0x%llX\n", tf->buffer.tsc);
1519       //printf("previous tsc&mask 0x%llX\n", tf->tsc_mask&tf->buffer.tsc);
1520       //printf("previous tsc&(~mask) 0x%llX\n", tf->buffer.tsc&(~tf->tsc_mask));
1521       if(event->timestamp < (tf->tsc_mask&tf->buffer.tsc)) {
1522         //printf("wrap\n");
1523         tf->buffer.tsc = ((tf->buffer.tsc&(~tf->tsc_mask))
1524                             + tf->tsc_mask_next_bit)
1525                                 | (guint64)event->timestamp;
1526         event->tsc = tf->buffer.tsc;
1527       } else {
1528         //printf("no wrap\n");
1529         /* no overflow */
1530         tf->buffer.tsc = (tf->buffer.tsc&(~tf->tsc_mask))
1531                                 | (guint64)event->timestamp;
1532         event->tsc = tf->buffer.tsc;
1533       }
1534       //printf("current tsc 0x%llX\n", tf->buffer.tsc);
1535     }
1536     pos += sizeof(guint32);
1537   } else {
1538     event->tsc = ltt_get_uint64(LTT_GET_BO(tf), pos);
1539     tf->buffer.tsc = event->tsc;
1540     event->compact_data = 0;
1541     pos += sizeof(guint64);
1542   }
1543   event->event_time = ltt_interpolate_time(tf, event);
1544
1545   if(!tf->compact) {
1546     event->event_id = ltt_get_uint16(LTT_GET_BO(tf), pos);
1547     pos += sizeof(guint16);
1548
1549     event->event_size = ltt_get_uint16(LTT_GET_BO(tf), pos);
1550     pos += sizeof(guint16);
1551   } else {
1552     /* Compact event */
1553     event->event_size = 0xFFFF;
1554   }
1555
1556   if (a_event_debug)
1557     print_debug_event_header(event, pos_aligned, pos);
1558
1559   /* Align the head */
1560   if(!tf->compact)
1561     pos += ltt_align((size_t)pos, tf->trace->arch_size, tf->alignment);
1562
1563   event->data = pos;
1564
1565   /* get the data size and update the event fields with the current
1566    * information. Also update the time if a heartbeat_full event is found. */
1567   ltt_update_event_size(tf);
1568
1569   return 0;
1570 }
1571
1572
1573 /****************************************************************************
1574  *Function name
1575  *    map_block       : map a block from the file
1576  *Input Params
1577  *    lttdes          : ltt trace file
1578  *    whichBlock      : the block which will be read
1579  *return value
1580  *    0               : success
1581  *    EINVAL          : lseek fail
1582  *    EIO             : can not read from the file
1583  ****************************************************************************/
1584
1585 static gint map_block(LttTracefile * tf, guint block_num)
1586 {
1587   int page_size = getpagesize();
1588   struct ltt_block_start_header *header;
1589
1590   g_assert(block_num < tf->num_blocks);
1591
1592   if(tf->buffer.head != NULL) {
1593     if(munmap(tf->buffer.head, PAGE_ALIGN(tf->buf_size))) {
1594     g_warning("unmap size : %u\n",
1595         PAGE_ALIGN(tf->buf_size));
1596       perror("munmap error");
1597       g_assert(0);
1598     }
1599   }
1600
1601
1602   /* Multiple of pages aligned head */
1603   tf->buffer.head = mmap(0,
1604       PAGE_ALIGN(tf->buf_size),
1605       PROT_READ, MAP_PRIVATE, tf->fd,
1606       PAGE_ALIGN((off_t)tf->buf_size * (off_t)block_num));
1607
1608   if(tf->buffer.head == MAP_FAILED) {
1609     perror("Error in allocating memory for buffer of tracefile");
1610     g_assert(0);
1611     goto map_error;
1612   }
1613   g_assert( ( (gulong)tf->buffer.head&(8-1) ) == 0); // make sure it's aligned.
1614
1615
1616   tf->buffer.index = block_num;
1617
1618   header = (struct ltt_block_start_header*)tf->buffer.head;
1619
1620 #if 0
1621   tf->buffer.begin.timestamp = ltt_time_add(
1622                                 ltt_time_from_uint64(
1623                                  ltt_get_uint64(LTT_GET_BO(tf),
1624                                   &header->begin.timestamp)
1625                                     - tf->trace->start_monotonic),
1626                                   tf->trace->start_time);
1627 #endif //0
1628   //g_debug("block %u begin : %lu.%lu", block_num,
1629   //    tf->buffer.begin.timestamp.tv_sec, tf->buffer.begin.timestamp.tv_nsec);
1630   tf->buffer.begin.cycle_count = ltt_get_uint64(LTT_GET_BO(tf),
1631                                               &header->begin.cycle_count);
1632   tf->buffer.begin.freq = ltt_get_uint64(LTT_GET_BO(tf),
1633                                          &header->begin.freq);
1634   if(tf->buffer.begin.freq == 0)
1635     tf->buffer.begin.freq = tf->trace->start_freq;
1636
1637   tf->buffer.begin.timestamp = ltt_interpolate_time_from_tsc(tf,
1638                                           tf->buffer.begin.cycle_count);
1639 #if 0
1640     ltt_time_add(
1641                                 ltt_time_from_uint64(
1642                                   (double)(tf->buffer.begin.cycle_count
1643                                   - tf->trace->start_tsc) * 1000000.0
1644                                     / (double)tf->trace->start_freq),
1645                                    tf->trace->start_time_from_tsc);
1646 #endif //0
1647 #if 0
1648
1649   tf->buffer.end.timestamp = ltt_time_add(
1650                                 ltt_time_from_uint64(
1651                                  ltt_get_uint64(LTT_GET_BO(tf),
1652                                   &header->end.timestamp)
1653                                     - tf->trace->start_monotonic),
1654                                   tf->trace->start_time);
1655 #endif //0
1656   //g_debug("block %u end : %lu.%lu", block_num,
1657   //    tf->buffer.end.timestamp.tv_sec, tf->buffer.end.timestamp.tv_nsec);
1658   tf->buffer.end.cycle_count = ltt_get_uint64(LTT_GET_BO(tf),
1659                                               &header->end.cycle_count);
1660   tf->buffer.end.freq = ltt_get_uint64(LTT_GET_BO(tf),
1661                                        &header->end.freq);
1662   if(tf->buffer.end.freq == 0)
1663     tf->buffer.end.freq = tf->trace->start_freq;
1664
1665   tf->buffer.lost_size = ltt_get_uint32(LTT_GET_BO(tf),
1666                                         &header->lost_size);
1667   tf->buffer.end.timestamp = ltt_interpolate_time_from_tsc(tf,
1668                                         tf->buffer.end.cycle_count);
1669 #if 0
1670     ltt_time_add(
1671                                 ltt_time_from_uint64(
1672                                   (double)(tf->buffer.end.cycle_count
1673                                   - tf->trace->start_tsc) * 1000000.0
1674                                     / (double)tf->trace->start_freq),
1675                                 tf->trace->start_time_from_tsc);
1676 #endif //0
1677   tf->buffer.tsc =  tf->buffer.begin.cycle_count;
1678   tf->event.tsc = tf->buffer.tsc;
1679   tf->buffer.freq = tf->buffer.begin.freq;
1680
1681   /* FIXME
1682    * eventually support variable buffer size : will need a partial pre-read of
1683    * the headers to create an index when we open the trace... eventually. */
1684   g_assert(tf->buf_size  == ltt_get_uint32(LTT_GET_BO(tf),
1685                                              &header->buf_size));
1686
1687   /* Now that the buffer is mapped, calculate the time interpolation for the
1688    * block. */
1689
1690 //  tf->buffer.nsecs_per_cycle = calc_nsecs_per_cycle(tf);
1691   //tf->buffer.cyc2ns_scale = calc_nsecs_per_cycle(tf);
1692
1693   /* Make the current event point to the beginning of the buffer :
1694    * it means that the event read must get the first event. */
1695   tf->event.tracefile = tf;
1696   tf->event.block = block_num;
1697   tf->event.offset = 0;
1698
1699   return 0;
1700
1701 map_error:
1702   return -errno;
1703
1704 }
1705
1706 static void print_debug_event_data(LttEvent *ev)
1707 {
1708   unsigned int offset = 0;
1709   int i, j;
1710
1711   if (!max(ev->event_size, ev->data_size))
1712     return;
1713
1714   g_printf("Event data (tracefile %s offset %llx):\n",
1715     g_quark_to_string(ev->tracefile->long_name),
1716     ((uint64_t)ev->tracefile->buffer.index * ev->tracefile->buf_size)
1717       + (long)ev->data - (long)ev->tracefile->buffer.head);
1718
1719   while (offset < max(ev->event_size, ev->data_size)) {
1720     g_printf("%8lx", (long)ev->data + offset
1721       - (long)ev->tracefile->buffer.head);
1722     g_printf("    ");
1723
1724     for (i = 0; i < 4 ; i++) {
1725       for (j = 0; j < 4; j++) {
1726         if (offset + ((i * 4) + j) < max(ev->event_size, ev->data_size))
1727           g_printf("%02hhX", ((char*)ev->data)[offset + ((i * 4) + j)]);
1728         else
1729           g_printf("  ");
1730         g_printf(" ");
1731       }
1732       if (i < 4)
1733       g_printf(" ");
1734     }
1735
1736     g_printf("    ");
1737
1738     for (i = 0; i < 4; i++) {
1739       for (j = 0; j < 4; j++) {
1740         if (offset + ((i * 4) + j) < max(ev->event_size, ev->data_size)) {
1741           if (isprint(((char*)ev->data)[offset + ((i * 4) + j)]))
1742             g_printf("%c", ((char*)ev->data)[offset + ((i * 4) + j)]);
1743           else
1744             g_printf(".");
1745         } else
1746           g_printf("  ");
1747       }
1748     }
1749     offset+=16;
1750     g_printf("\n");
1751   }
1752 }
1753
1754 /* It will update the fields offsets too */
1755 void ltt_update_event_size(LttTracefile *tf)
1756 {
1757   off_t size = 0;
1758   char *tscdata;
1759   struct marker_info *info;
1760
1761   switch((enum marker_id)tf->event.event_id) {
1762     case MARKER_ID_SET_MARKER_ID:
1763       size = strlen((char*)tf->event.data) + 1;
1764       g_debug("marker %s id set", (char*)tf->event.data);
1765       size += ltt_align(size, sizeof(guint16), tf->alignment);
1766       size += sizeof(guint16);
1767       size += sizeof(guint8);
1768       size += sizeof(guint8);
1769       size += sizeof(guint8);
1770       size += sizeof(guint8);
1771       size += sizeof(guint8);
1772       break;
1773     case MARKER_ID_SET_MARKER_FORMAT:
1774       g_debug("marker %s format set", (char*)tf->event.data);
1775       size = strlen((char*)tf->event.data) + 1;
1776       size += strlen((char*)tf->event.data + size) + 1;
1777       break;
1778     case MARKER_ID_HEARTBEAT_32:
1779       g_debug("Update Event heartbeat 32 bits");
1780       break;
1781     case MARKER_ID_HEARTBEAT_64:
1782       g_debug("Update Event heartbeat 64 bits");
1783       tscdata = (char*)(tf->event.data);
1784       tf->event.tsc = ltt_get_uint64(LTT_GET_BO(tf), tscdata);
1785       tf->buffer.tsc = tf->event.tsc;
1786       tf->event.event_time = ltt_interpolate_time(tf, &tf->event);
1787       size = ltt_align(size, sizeof(guint64), tf->alignment);
1788       size += sizeof(guint64);
1789       break;
1790   }
1791
1792   info = marker_get_info_from_id(tf->trace, tf->event.event_id);
1793
1794   if (tf->event.event_id >= MARKER_CORE_IDS)
1795     g_assert(info != NULL);
1796
1797   /* Do not update field offsets of core markers when initially reading the
1798    * facility tracefile when the infos about these markers do not exist yet.
1799    */
1800   if (likely(info && info->fields)) {
1801     if (info->size != -1)
1802       size = info->size;
1803     else
1804       size = marker_update_fields_offsets(marker_get_info_from_id(tf->trace,
1805                                    tf->event.event_id), tf->event.data);
1806   }
1807
1808   tf->event.data_size = size;
1809
1810   /* Check consistency between kernel and LTTV structure sizes */
1811   if(tf->event.event_size == 0xFFFF) {
1812     /* Event size too big to fit in the event size field */
1813     tf->event.event_size = tf->event.data_size;
1814   }
1815
1816   if (a_event_debug)
1817     print_debug_event_data(&tf->event);
1818
1819   /* Having a marker load or marker format event out of the facilities
1820    * tracefiles is a serious bug. */
1821   switch((enum marker_id)tf->event.event_id) {
1822     case MARKER_ID_SET_MARKER_ID:
1823     case MARKER_ID_SET_MARKER_FORMAT:
1824       if (tf->name != g_quark_from_string("/control/facilities"))
1825         g_error("Trace inconsistency : metadata event found in data "
1826                 "tracefile %s", g_quark_to_string(tf->long_name));
1827   }
1828
1829   if (tf->event.data_size != tf->event.event_size) {
1830     struct marker_info *info = marker_get_info_from_id(tf->trace,
1831                                                        tf->event.event_id);
1832     g_error("Kernel/LTTV event size differs for event %s: kernel %u, LTTV %u",
1833         g_quark_to_string(info->name),
1834         tf->event.event_size, tf->event.data_size);
1835     exit(-1);
1836   }
1837 }
1838
1839
1840 /* Take the tf current event offset and use the event facility id and event id
1841  * to figure out where is the next event offset.
1842  *
1843  * This is an internal function not aiming at being used elsewhere : it will
1844  * not jump over the current block limits. Please consider using
1845  * ltt_tracefile_read to do this.
1846  *
1847  * Returns 0 on success
1848  *         ERANGE if we are at the end of the buffer.
1849  *         ENOPROTOOPT if an error occured when getting the current event size.
1850  */
1851 static int ltt_seek_next_event(LttTracefile *tf)
1852 {
1853   int ret = 0;
1854   void *pos;
1855
1856   /* seek over the buffer header if we are at the buffer start */
1857   if(tf->event.offset == 0) {
1858     tf->event.offset += tf->buffer_header_size;
1859
1860     if(tf->event.offset == tf->buf_size - tf->buffer.lost_size) {
1861       ret = ERANGE;
1862     }
1863     goto found;
1864   }
1865
1866
1867   pos = tf->event.data;
1868
1869   if(tf->event.data_size < 0) goto error;
1870
1871   pos += (size_t)tf->event.data_size;
1872
1873   tf->event.offset = pos - tf->buffer.head;
1874
1875   if(tf->event.offset == tf->buf_size - tf->buffer.lost_size) {
1876     ret = ERANGE;
1877     goto found;
1878   }
1879   g_assert(tf->event.offset < tf->buf_size - tf->buffer.lost_size);
1880
1881 found:
1882   return ret;
1883
1884 error:
1885   g_error("Error in ltt_seek_next_event for tracefile %s",
1886       g_quark_to_string(tf->name));
1887   return ENOPROTOOPT;
1888 }
1889
1890 #if 0
1891 /*****************************************************************************
1892  *Function name
1893  *    calc_nsecs_per_cycle : calculate nsecs per cycle for current block
1894  *
1895  *    1.0 / (freq(khz) *1000)  * 1000000000
1896  *Input Params
1897  *    t               : tracefile
1898  ****************************************************************************/
1899 /* from timer_tsc.c */
1900 #define CYC2NS_SCALE_FACTOR 10
1901 static guint32 calc_nsecs_per_cycle(LttTracefile * tf)
1902 {
1903   //return 1e6 / (double)tf->buffer.freq;
1904   guint32 cpu_mhz = tf->buffer.freq / 1000;
1905   guint32 cyc2ns_scale = (1000 << CYC2NS_SCALE_FACTOR)/cpu_mhz;
1906
1907   return cyc2ns_scale;
1908  // return 1e6 / (double)tf->buffer.freq;
1909 }
1910
1911 static guint64 cycles_2_ns(LttTracefile *tf, guint64 cycles)
1912 {
1913   return (cycles * tf->buffer.cyc2ns_scale) >> CYC2NS_SCALE_FACTOR;
1914 }
1915 #endif //0
1916
1917 #if 0
1918 void setFieldsOffset(LttTracefile *tf, LttEventType *evT,void *evD)
1919 {
1920   LttField * rootFld = evT->root_field;
1921   //  rootFld->base_address = evD;
1922
1923   if(likely(rootFld))
1924     rootFld->field_size = getFieldtypeSize(tf, evT->facility,
1925         evT, 0,0,rootFld, evD);
1926 }
1927 #endif //0
1928 #if 0
1929 /*****************************************************************************
1930  *Function name
1931  *    set_fields_offsets : set the precomputable offset of the fields
1932  *Input params
1933  *    tracefile       : opened trace file
1934  *    event_type      : the event type
1935  ****************************************************************************/
1936
1937 void set_fields_offsets(LttTracefile *tf, LttEventType *event_type)
1938 {
1939   LttField *field = event_type->root_field;
1940   enum field_status fixed_root = FIELD_FIXED, fixed_parent = FIELD_FIXED;
1941
1942   if(likely(field))
1943     preset_field_type_size(tf, event_type, 0, 0,
1944         &fixed_root, &fixed_parent,
1945         field);
1946
1947 }
1948 #endif //0
1949
1950
1951 /*****************************************************************************
1952  *Function name
1953  *    get_alignment : Get the alignment needed for a field.
1954  *Input params
1955  *    field : field
1956  *
1957  *    returns : The size on which it must be aligned.
1958  *
1959  ****************************************************************************/
1960 #if 0
1961 off_t get_alignment(LttField *field)
1962 {
1963   LttType *type = &field->field_type;
1964
1965   switch(type->type_class) {
1966     case LTT_INT_FIXED:
1967     case LTT_UINT_FIXED:
1968     case LTT_POINTER:
1969     case LTT_CHAR:
1970     case LTT_UCHAR:
1971     case LTT_SHORT:
1972     case LTT_USHORT:
1973     case LTT_INT:
1974     case LTT_UINT:
1975     case LTT_LONG:
1976     case LTT_ULONG:
1977     case LTT_SIZE_T:
1978     case LTT_SSIZE_T:
1979     case LTT_OFF_T:
1980     case LTT_FLOAT:
1981     case LTT_ENUM:
1982       /* Align offset on type size */
1983       g_assert(field->field_size != 0);
1984       return field->field_size;
1985       break;
1986     case LTT_STRING:
1987       return 1;
1988       break;
1989     case LTT_ARRAY:
1990       g_assert(type->fields->len == 1);
1991       {
1992         LttField *child = &g_array_index(type->fields, LttField, 0);
1993         return get_alignment(child);
1994       }
1995       break;
1996     case LTT_SEQUENCE:
1997       g_assert(type->fields->len == 2);
1998       {
1999         off_t localign = 1;
2000         LttField *child = &g_array_index(type->fields, LttField, 0);
2001
2002         localign = max(localign, get_alignment(child));
2003
2004         child = &g_array_index(type->fields, LttField, 1);
2005         localign = max(localign, get_alignment(child));
2006
2007         return localign;
2008       }
2009       break;
2010     case LTT_STRUCT:
2011     case LTT_UNION:
2012       {
2013         guint i;
2014         off_t localign = 1;
2015
2016         for(i=0; i<type->fields->len; i++) {
2017           LttField *child = &g_array_index(type->fields, LttField, i);
2018           localign = max(localign, get_alignment(child));
2019         }
2020         return localign;
2021       }
2022       break;
2023     case LTT_NONE:
2024     default:
2025       g_error("get_alignment : unknown type");
2026       return -1;
2027   }
2028 }
2029
2030 #endif //0
2031
2032 /*****************************************************************************
2033  *Function name
2034  *    field_compute_static_size : Determine the size of fields known by their
2035  *    sole definition. Unions, arrays and struct sizes might be known, but
2036  *    the parser does not give that information.
2037  *Input params
2038  *    tf : tracefile
2039  *    field : field
2040  *
2041  ****************************************************************************/
2042 #if 0
2043 void field_compute_static_size(LttFacility *fac, LttField *field)
2044 {
2045   LttType *type = &field->field_type;
2046
2047   switch(type->type_class) {
2048     case LTT_INT_FIXED:
2049     case LTT_UINT_FIXED:
2050     case LTT_POINTER:
2051     case LTT_CHAR:
2052     case LTT_UCHAR:
2053     case LTT_SHORT:
2054     case LTT_USHORT:
2055     case LTT_INT:
2056     case LTT_UINT:
2057     case LTT_LONG:
2058     case LTT_ULONG:
2059     case LTT_SIZE_T:
2060     case LTT_SSIZE_T:
2061     case LTT_OFF_T:
2062     case LTT_FLOAT:
2063     case LTT_ENUM:
2064     case LTT_STRING:
2065       /* nothing to do */
2066       break;
2067     case LTT_ARRAY:
2068       /* note this : array type size is the number of elements in the array,
2069        * while array field size of the length of the array in bytes */
2070       g_assert(type->fields->len == 1);
2071       {
2072         LttField *child = &g_array_index(type->fields, LttField, 0);
2073         field_compute_static_size(fac, child);
2074
2075         if(child->field_size != 0) {
2076           field->field_size = type->size * child->field_size;
2077           field->dynamic_offsets = g_array_sized_new(FALSE, TRUE,
2078               sizeof(off_t), type->size);
2079         } else {
2080           field->field_size = 0;
2081         }
2082       }
2083       break;
2084     case LTT_SEQUENCE:
2085       g_assert(type->fields->len == 2);
2086       {
2087         off_t local_offset = 0;
2088         LttField *child = &g_array_index(type->fields, LttField, 1);
2089         field_compute_static_size(fac, child);
2090         field->field_size = 0;
2091         type->size = 0;
2092         if(child->field_size != 0) {
2093           field->dynamic_offsets = g_array_sized_new(FALSE, TRUE,
2094               sizeof(off_t), SEQUENCE_AVG_ELEMENTS);
2095         }
2096       }
2097       break;
2098     case LTT_STRUCT:
2099     case LTT_UNION:
2100       {
2101         guint i;
2102         for(i=0;i<type->fields->len;i++) {
2103           LttField *child = &g_array_index(type->fields, LttField, i);
2104           field_compute_static_size(fac, child);
2105           if(child->field_size != 0) {
2106             type->size += ltt_align(type->size, get_alignment(child),
2107                                     fac->alignment);
2108             type->size += child->field_size;
2109           } else {
2110             /* As soon as we find a child with variable size, we have
2111              * a variable size */
2112             type->size = 0;
2113             break;
2114           }
2115         }
2116         field->field_size = type->size;
2117       }
2118       break;
2119     default:
2120       g_error("field_static_size : unknown type");
2121   }
2122
2123 }
2124 #endif //0
2125
2126
2127 /*****************************************************************************
2128  *Function name
2129  *    precompute_fields_offsets : set the precomputable offset of the fields
2130  *Input params
2131  *    fac : facility
2132  *    field : the field
2133  *    offset : pointer to the current offset, must be incremented
2134  *
2135  *    return : 1 : found a variable length field, stop the processing.
2136  *             0 otherwise.
2137  ****************************************************************************/
2138
2139 #if 0
2140 gint precompute_fields_offsets(LttFacility *fac, LttField *field, off_t *offset, gint is_compact)
2141 {
2142   LttType *type = &field->field_type;
2143
2144   if(unlikely(is_compact)) {
2145     g_assert(field->field_size != 0);
2146     /* FIXME THIS IS A HUUUUUGE hack :
2147      * offset is between the compact_data field in struct LttEvent
2148      * and the address of the field root in the memory map.
2149      * ark. Both will stay at the same addresses while the event
2150      * is readable, so it's ok.
2151      */
2152     field->offset_root = 0;
2153     field->fixed_root = FIELD_FIXED;
2154     return 0;
2155   }
2156
2157   switch(type->type_class) {
2158     case LTT_INT_FIXED:
2159     case LTT_UINT_FIXED:
2160     case LTT_POINTER:
2161     case LTT_CHAR:
2162     case LTT_UCHAR:
2163     case LTT_SHORT:
2164     case LTT_USHORT:
2165     case LTT_INT:
2166     case LTT_UINT:
2167     case LTT_LONG:
2168     case LTT_ULONG:
2169     case LTT_SIZE_T:
2170     case LTT_SSIZE_T:
2171     case LTT_OFF_T:
2172     case LTT_FLOAT:
2173     case LTT_ENUM:
2174       g_assert(field->field_size != 0);
2175       /* Align offset on type size */
2176       *offset += ltt_align(*offset, get_alignment(field),
2177                            fac->alignment);
2178       /* remember offset */
2179       field->offset_root = *offset;
2180       field->fixed_root = FIELD_FIXED;
2181       /* Increment offset */
2182       *offset += field->field_size;
2183       return 0;
2184       break;
2185     case LTT_STRING:
2186       field->offset_root = *offset;
2187       field->fixed_root = FIELD_FIXED;
2188       return 1;
2189       break;
2190     case LTT_ARRAY:
2191       g_assert(type->fields->len == 1);
2192       {
2193         LttField *child = &g_array_index(type->fields, LttField, 0);
2194
2195         *offset += ltt_align(*offset, get_alignment(field),
2196                              fac->alignment);
2197
2198         /* remember offset */
2199         field->offset_root = *offset;
2200         field->array_offset = *offset;
2201         field->fixed_root = FIELD_FIXED;
2202
2203         /* Let the child be variable */
2204         //precompute_fields_offsets(tf, child, offset);
2205
2206         if(field->field_size != 0) {
2207           /* Increment offset */
2208           /* field_size is the array size in bytes */
2209           *offset += field->field_size;
2210           return 0;
2211         } else {
2212           return 1;
2213         }
2214       }
2215       break;
2216     case LTT_SEQUENCE:
2217       g_assert(type->fields->len == 2);
2218       {
2219         LttField *child;
2220         guint ret;
2221
2222         *offset += ltt_align(*offset, get_alignment(field),
2223                              fac->alignment);
2224
2225         /* remember offset */
2226         field->offset_root = *offset;
2227         field->fixed_root = FIELD_FIXED;
2228
2229         child = &g_array_index(type->fields, LttField, 0);
2230         ret = precompute_fields_offsets(fac, child, offset, is_compact);
2231         g_assert(ret == 0); /* Seq len cannot have variable len */
2232
2233         child = &g_array_index(type->fields, LttField, 1);
2234         *offset += ltt_align(*offset, get_alignment(child),
2235                              fac->alignment);
2236         field->array_offset = *offset;
2237         /* Let the child be variable. */
2238         //ret = precompute_fields_offsets(fac, child, offset);
2239
2240         /* Cannot precompute fields offsets of sequence members, and has
2241          * variable length. */
2242         return 1;
2243       }
2244       break;
2245     case LTT_STRUCT:
2246       {
2247         LttField *child;
2248         guint i;
2249         gint ret=0;
2250
2251         *offset += ltt_align(*offset, get_alignment(field),
2252                              fac->alignment);
2253         /* remember offset */
2254         field->offset_root = *offset;
2255         field->fixed_root = FIELD_FIXED;
2256
2257         for(i=0; i< type->fields->len; i++) {
2258           child = &g_array_index(type->fields, LttField, i);
2259           ret = precompute_fields_offsets(fac, child, offset, is_compact);
2260
2261           if(ret) break;
2262         }
2263         return ret;
2264       }
2265       break;
2266     case LTT_UNION:
2267       {
2268         LttField *child;
2269         guint i;
2270         gint ret=0;
2271
2272         *offset += ltt_align(*offset, get_alignment(field),
2273                              fac->alignment);
2274         /* remember offset */
2275         field->offset_root = *offset;
2276         field->fixed_root = FIELD_FIXED;
2277
2278         for(i=0; i< type->fields->len; i++) {
2279           *offset = field->offset_root;
2280           child = &g_array_index(type->fields, LttField, i);
2281           ret = precompute_fields_offsets(fac, child, offset, is_compact);
2282
2283           if(ret) break;
2284         }
2285         *offset = field->offset_root + field->field_size;
2286         return ret;
2287       }
2288
2289       break;
2290     case LTT_NONE:
2291     default:
2292       g_error("precompute_fields_offsets : unknown type");
2293       return 1;
2294   }
2295
2296 }
2297
2298 #endif //0
2299
2300 #if 0
2301 /*****************************************************************************
2302  *Function name
2303  *    precompute_offsets : set the precomputable offset of an event type
2304  *Input params
2305  *    tf : tracefile
2306  *    event : event type
2307  *
2308  ****************************************************************************/
2309 void precompute_offsets(LttFacility *fac, LttEventType *event)
2310 {
2311   guint i;
2312   off_t offset = 0;
2313   gint ret;
2314
2315   /* First, compute the size of fixed size fields. Will determine size for
2316    * arrays, struct and unions, which is not done by the parser */
2317   for(i=0; i<event->fields->len; i++) {
2318     LttField *field = &g_array_index(event->fields, LttField, i);
2319     field_compute_static_size(fac, field);
2320   }
2321
2322   /* Precompute all known offsets */
2323   for(i=0; i<event->fields->len; i++) {
2324     LttField *field = &g_array_index(event->fields, LttField, i);
2325     if(event->has_compact_data && i == 0)
2326       ret = precompute_fields_offsets(fac, field, &offset, 1);
2327     else
2328       ret = precompute_fields_offsets(fac, field, &offset, 0);
2329     if(ret) break;
2330   }
2331 }
2332 #endif //0
2333
2334
2335
2336 /*****************************************************************************
2337  *Function name
2338  *    preset_field_type_size : set the fixed sizes of the field type
2339  *Input params
2340  *    tf              : tracefile
2341  *    event_type      : event type
2342  *    offset_root     : offset from the root
2343  *    offset_parent   : offset from the parent
2344  *    fixed_root      : Do we know a fixed offset to the root ?
2345  *    fixed_parent    : Do we know a fixed offset to the parent ?
2346  *    field           : field
2347  ****************************************************************************/
2348
2349
2350
2351 // preset the fixed size offsets. Calculate them just like genevent-new : an
2352 // increment of a *to value that represents the offset from the start of the
2353 // event data.
2354 // The preset information is : offsets up to (and including) the first element
2355 // of variable size. All subsequent fields must be flagged "VARIABLE OFFSET".
2356 #if 0
2357 void preset_field_type_size(LttTracefile *tf, LttEventType *event_type,
2358     off_t offset_root, off_t offset_parent,
2359     enum field_status *fixed_root, enum field_status *fixed_parent,
2360     LttField *field)
2361 {
2362   enum field_status local_fixed_root, local_fixed_parent;
2363   guint i;
2364   LttType *type;
2365
2366   g_assert(field->fixed_root == FIELD_UNKNOWN);
2367   g_assert(field->fixed_parent == FIELD_UNKNOWN);
2368   g_assert(field->fixed_size == FIELD_UNKNOWN);
2369
2370   type = field->field_type;
2371
2372   field->fixed_root = *fixed_root;
2373   if(field->fixed_root == FIELD_FIXED)
2374     field->offset_root = offset_root;
2375   else
2376     field->offset_root = 0;
2377
2378   field->fixed_parent = *fixed_parent;
2379   if(field->fixed_parent == FIELD_FIXED)
2380     field->offset_parent = offset_parent;
2381   else
2382     field->offset_parent = 0;
2383
2384   size_t current_root_offset;
2385   size_t current_offset;
2386   enum field_status current_child_status, final_child_status;
2387   size_t max_size;
2388
2389   switch(type->type_class) {
2390     case LTT_INT_FIXED:
2391     case LTT_UINT_FIXED:
2392     case LTT_CHAR:
2393     case LTT_UCHAR:
2394     case LTT_SHORT:
2395     case LTT_USHORT:
2396     case LTT_INT:
2397     case LTT_UINT:
2398     case LTT_FLOAT:
2399     case LTT_ENUM:
2400       field->field_size = ltt_type_size(tf->trace, type);
2401       field->fixed_size = FIELD_FIXED;
2402       break;
2403     case LTT_POINTER:
2404       field->field_size = (off_t)event_type->facility->pointer_size;
2405       field->fixed_size = FIELD_FIXED;
2406       break;
2407     case LTT_LONG:
2408     case LTT_ULONG:
2409       field->field_size = (off_t)event_type->facility->long_size;
2410       field->fixed_size = FIELD_FIXED;
2411       break;
2412     case LTT_SIZE_T:
2413     case LTT_SSIZE_T:
2414     case LTT_OFF_T:
2415       field->field_size = (off_t)event_type->facility->size_t_size;
2416       field->fixed_size = FIELD_FIXED;
2417       break;
2418     case LTT_SEQUENCE:
2419       local_fixed_root = FIELD_VARIABLE;
2420       local_fixed_parent = FIELD_VARIABLE;
2421       preset_field_type_size(tf, event_type,
2422         0, 0,
2423         &local_fixed_root, &local_fixed_parent,
2424         field->child[0]);
2425       field->fixed_size = FIELD_VARIABLE;
2426       field->field_size = 0;
2427       *fixed_root = FIELD_VARIABLE;
2428       *fixed_parent = FIELD_VARIABLE;
2429       break;
2430     case LTT_STRING:
2431       field->fixed_size = FIELD_VARIABLE;
2432       field->field_size = 0;
2433       *fixed_root = FIELD_VARIABLE;
2434       *fixed_parent = FIELD_VARIABLE;
2435       break;
2436     case LTT_ARRAY:
2437       local_fixed_root = FIELD_VARIABLE;
2438       local_fixed_parent = FIELD_VARIABLE;
2439       preset_field_type_size(tf, event_type,
2440         0, 0,
2441         &local_fixed_root, &local_fixed_parent,
2442         field->child[0]);
2443       field->fixed_size = field->child[0]->fixed_size;
2444       if(field->fixed_size == FIELD_FIXED) {
2445         field->field_size = type->element_number * field->child[0]->field_size;
2446       } else {
2447         field->field_size = 0;
2448         *fixed_root = FIELD_VARIABLE;
2449         *fixed_parent = FIELD_VARIABLE;
2450       }
2451       break;
2452     case LTT_STRUCT:
2453       current_root_offset = field->offset_root;
2454       current_offset = 0;
2455       current_child_status = FIELD_FIXED;
2456       for(i=0;i<type->element_number;i++) {
2457         preset_field_type_size(tf, event_type,
2458           current_root_offset, current_offset,
2459           fixed_root, &current_child_status,
2460           field->child[i]);
2461         if(current_child_status == FIELD_FIXED) {
2462           current_root_offset += field->child[i]->field_size;
2463           current_offset += field->child[i]->field_size;
2464         } else {
2465           current_root_offset = 0;
2466           current_offset = 0;
2467         }
2468       }
2469       if(current_child_status != FIELD_FIXED) {
2470         *fixed_parent = current_child_status;
2471         field->field_size = 0;
2472         field->fixed_size = current_child_status;
2473       } else {
2474         field->field_size = current_offset;
2475         field->fixed_size = FIELD_FIXED;
2476       }
2477       break;
2478     case LTT_UNION:
2479       current_root_offset = field->offset_root;
2480       current_offset = 0;
2481       max_size = 0;
2482       final_child_status = FIELD_FIXED;
2483       for(i=0;i<type->element_number;i++) {
2484         enum field_status current_root_child_status = FIELD_FIXED;
2485         enum field_status current_child_status = FIELD_FIXED;
2486         preset_field_type_size(tf, event_type,
2487           current_root_offset, current_offset,
2488           &current_root_child_status, &current_child_status,
2489           field->child[i]);
2490         if(current_child_status != FIELD_FIXED)
2491           final_child_status = current_child_status;
2492         else
2493           max_size = max(max_size, field->child[i]->field_size);
2494       }
2495       if(final_child_status != FIELD_FIXED) {
2496         g_error("LTTV does not support variable size fields in unions.");
2497         /* This will stop the application. */
2498         *fixed_root = final_child_status;
2499         *fixed_parent = final_child_status;
2500         field->field_size = 0;
2501         field->fixed_size = current_child_status;
2502       } else {
2503         field->field_size = max_size;
2504         field->fixed_size = FIELD_FIXED;
2505       }
2506       break;
2507     case LTT_NONE:
2508       g_error("unexpected type NONE");
2509       break;
2510   }
2511
2512 }
2513 #endif //0
2514
2515 /*****************************************************************************
2516  *Function name
2517  *    check_fields_compatibility : Check for compatibility between two fields :
2518  *    do they use the same inner structure ?
2519  *Input params
2520  *    event_type1     : event type
2521  *    event_type2     : event type
2522  *    field1          : field
2523  *    field2          : field
2524  *Returns : 0 if identical
2525  *          1 if not.
2526  ****************************************************************************/
2527 // this function checks for equality of field types. Therefore, it does not use
2528 // per se offsets. For instance, an aligned version of a structure is
2529 // compatible with an unaligned version of the same structure.
2530 #if 0
2531 gint check_fields_compatibility(LttEventType *event_type1,
2532     LttEventType *event_type2,
2533     LttField *field1, LttField *field2)
2534 {
2535   guint different = 0;
2536   LttType *type1;
2537   LttType *type2;
2538
2539   if(field1 == NULL) {
2540     if(field2 == NULL) goto end;
2541     else {
2542       different = 1;
2543       goto end;
2544     }
2545   } else if(field2 == NULL) {
2546     different = 1;
2547     goto end;
2548   }
2549
2550   type1 = &field1->field_type;
2551   type2 = &field2->field_type;
2552
2553   if(type1->type_class != type2->type_class) {
2554     different = 1;
2555     goto end;
2556   }
2557   if(type1->network != type2->network) {
2558     different = 1;
2559     goto end;
2560   }
2561
2562   switch(type1->type_class) {
2563     case LTT_INT_FIXED:
2564     case LTT_UINT_FIXED:
2565     case LTT_POINTER:
2566     case LTT_CHAR:
2567     case LTT_UCHAR:
2568     case LTT_SHORT:
2569     case LTT_USHORT:
2570     case LTT_INT:
2571     case LTT_UINT:
2572     case LTT_LONG:
2573     case LTT_ULONG:
2574     case LTT_SIZE_T:
2575     case LTT_SSIZE_T:
2576     case LTT_OFF_T:
2577     case LTT_FLOAT:
2578     case LTT_ENUM:
2579       if(field1->field_size != field2->field_size)
2580         different = 1;
2581       break;
2582     case LTT_STRING:
2583       break;
2584     case LTT_ARRAY:
2585       {
2586         LttField *child1 = &g_array_index(type1->fields, LttField, 0);
2587         LttField *child2 = &g_array_index(type2->fields, LttField, 0);
2588
2589         if(type1->size != type2->size)
2590           different = 1;
2591         if(check_fields_compatibility(event_type1, event_type2, child1, child2))
2592           different = 1;
2593       }
2594       break;
2595     case LTT_SEQUENCE:
2596       {
2597         LttField *child1 = &g_array_index(type1->fields, LttField, 1);
2598         LttField *child2 = &g_array_index(type2->fields, LttField, 1);
2599
2600         if(check_fields_compatibility(event_type1, event_type2, child1, child2))
2601           different = 1;
2602       }
2603       break;
2604     case LTT_STRUCT:
2605     case LTT_UNION:
2606       {
2607         LttField *child;
2608         guint i;
2609
2610         if(type1->fields->len != type2->fields->len) {
2611           different = 1;
2612           goto end;
2613         }
2614
2615         for(i=0; i< type1->fields->len; i++) {
2616           LttField *child1;
2617           LttField *child2;
2618           child1 = &g_array_index(type1->fields, LttField, i);
2619           child2 = &g_array_index(type2->fields, LttField, i);
2620           different = check_fields_compatibility(event_type1,
2621                         event_type2, child1, child2);
2622
2623           if(different) break;
2624         }
2625       }
2626       break;
2627     case LTT_NONE:
2628     default:
2629       g_error("check_fields_compatibility : unknown type");
2630   }
2631
2632 end:
2633   return different;
2634 }
2635 #endif //0
2636
2637 #if 0
2638 gint check_fields_compatibility(LttEventType *event_type1,
2639     LttEventType *event_type2,
2640     LttField *field1, LttField *field2)
2641 {
2642   guint different = 0;
2643   guint i;
2644   LttType *type1;
2645   LttType *type2;
2646
2647   if(field1 == NULL) {
2648     if(field2 == NULL) goto end;
2649     else {
2650       different = 1;
2651       goto end;
2652     }
2653   } else if(field2 == NULL) {
2654     different = 1;
2655     goto end;
2656   }
2657
2658   g_assert(field1->fixed_root != FIELD_UNKNOWN);
2659   g_assert(field2->fixed_root != FIELD_UNKNOWN);
2660   g_assert(field1->fixed_parent != FIELD_UNKNOWN);
2661   g_assert(field2->fixed_parent != FIELD_UNKNOWN);
2662   g_assert(field1->fixed_size != FIELD_UNKNOWN);
2663   g_assert(field2->fixed_size != FIELD_UNKNOWN);
2664
2665   type1 = field1->field_type;
2666   type2 = field2->field_type;
2667
2668   if(type1->type_class != type2->type_class) {
2669     different = 1;
2670     goto end;
2671   }
2672   if(type1->element_name != type2->element_name) {
2673     different = 1;
2674     goto end;
2675   }
2676
2677   switch(type1->type_class) {
2678     case LTT_INT_FIXED:
2679     case LTT_UINT_FIXED:
2680     case LTT_POINTER:
2681     case LTT_CHAR:
2682     case LTT_UCHAR:
2683     case LTT_SHORT:
2684     case LTT_USHORT:
2685     case LTT_INT:
2686     case LTT_UINT:
2687     case LTT_FLOAT:
2688     case LTT_POINTER:
2689     case LTT_LONG:
2690     case LTT_ULONG:
2691     case LTT_SIZE_T:
2692     case LTT_SSIZE_T:
2693     case LTT_OFF_T:
2694       if(field1->field_size != field2->field_size) {
2695         different = 1;
2696         goto end;
2697       }
2698       break;
2699     case LTT_ENUM:
2700       if(type1->element_number != type2->element_number) {
2701         different = 1;
2702         goto end;
2703       }
2704       for(i=0;i<type1->element_number;i++) {
2705         if(type1->enum_strings[i] != type2->enum_strings[i]) {
2706           different = 1;
2707           goto end;
2708         }
2709       }
2710       break;
2711     case LTT_SEQUENCE:
2712       /* Two elements : size and child */
2713       g_assert(type1->element_number != type2->element_number);
2714       for(i=0;i<type1->element_number;i++) {
2715         if(check_fields_compatibility(event_type1, event_type2,
2716           field1->child[0], field2->child[0])) {
2717           different = 1;
2718           goto end;
2719         }
2720       }
2721       break;
2722     case LTT_STRING:
2723       break;
2724     case LTT_ARRAY:
2725       if(field1->field_size != field2->field_size) {
2726         different = 1;
2727         goto end;
2728       }
2729       /* Two elements : size and child */
2730       g_assert(type1->element_number != type2->element_number);
2731       for(i=0;i<type1->element_number;i++) {
2732         if(check_fields_compatibility(event_type1, event_type2,
2733           field1->child[0], field2->child[0])) {
2734           different = 1;
2735           goto end;
2736         }
2737       }
2738       break;
2739     case LTT_STRUCT:
2740     case LTT_UNION:
2741       if(type1->element_number != type2->element_number) {
2742         different = 1;
2743         break;
2744       }
2745       for(i=0;i<type1->element_number;i++) {
2746         if(check_fields_compatibility(event_type1, event_type2,
2747           field1->child[0], field2->child[0])) {
2748           different = 1;
2749           goto end;
2750         }
2751       }
2752       break;
2753   }
2754 end:
2755   return different;
2756 }
2757 #endif //0
2758
2759
2760 /*****************************************************************************
2761  *Function name
2762  *    ltt_get_int    : get an integer number
2763  *Input params
2764  *    reverse_byte_order: must we reverse the byte order ?
2765  *    size            : the size of the integer
2766  *    ptr             : the data pointer
2767  *Return value
2768  *    gint64          : a 64 bits integer
2769  ****************************************************************************/
2770
2771 gint64 ltt_get_int(gboolean reverse_byte_order, gint size, void *data)
2772 {
2773   gint64 val;
2774
2775   switch(size) {
2776     case 1: val = *((gint8*)data); break;
2777     case 2: val = ltt_get_int16(reverse_byte_order, data); break;
2778     case 4: val = ltt_get_int32(reverse_byte_order, data); break;
2779     case 8: val = ltt_get_int64(reverse_byte_order, data); break;
2780     default: val = ltt_get_int64(reverse_byte_order, data);
2781              g_critical("get_int : integer size %d unknown", size);
2782              break;
2783   }
2784
2785   return val;
2786 }
2787
2788 /*****************************************************************************
2789  *Function name
2790  *    ltt_get_uint    : get an unsigned integer number
2791  *Input params
2792  *    reverse_byte_order: must we reverse the byte order ?
2793  *    size            : the size of the integer
2794  *    ptr             : the data pointer
2795  *Return value
2796  *    guint64         : a 64 bits unsigned integer
2797  ****************************************************************************/
2798
2799 guint64 ltt_get_uint(gboolean reverse_byte_order, gint size, void *data)
2800 {
2801   guint64 val;
2802
2803   switch(size) {
2804     case 1: val = *((gint8*)data); break;
2805     case 2: val = ltt_get_uint16(reverse_byte_order, data); break;
2806     case 4: val = ltt_get_uint32(reverse_byte_order, data); break;
2807     case 8: val = ltt_get_uint64(reverse_byte_order, data); break;
2808     default: val = ltt_get_uint64(reverse_byte_order, data);
2809              g_critical("get_uint : unsigned integer size %d unknown",
2810                  size);
2811              break;
2812   }
2813
2814   return val;
2815 }
2816
2817
2818 /* get the node name of the system */
2819
2820 char * ltt_trace_system_description_node_name (LttSystemDescription * s)
2821 {
2822   return s->node_name;
2823 }
2824
2825
2826 /* get the domain name of the system */
2827
2828 char * ltt_trace_system_description_domain_name (LttSystemDescription * s)
2829 {
2830   return s->domain_name;
2831 }
2832
2833
2834 /* get the description of the system */
2835
2836 char * ltt_trace_system_description_description (LttSystemDescription * s)
2837 {
2838   return s->description;
2839 }
2840
2841
2842 /* get the NTP corrected start time of the trace */
2843 LttTime ltt_trace_start_time(LttTrace *t)
2844 {
2845   return t->start_time;
2846 }
2847
2848 /* get the monotonic start time of the trace */
2849 LttTime ltt_trace_start_time_monotonic(LttTrace *t)
2850 {
2851   return t->start_time_from_tsc;
2852 }
2853
2854 static LttTracefile *ltt_tracefile_new()
2855 {
2856   LttTracefile *tf;
2857   tf = g_new(LttTracefile, 1);
2858   tf->event.tracefile = tf;
2859   return tf;
2860 }
2861
2862 static void ltt_tracefile_destroy(LttTracefile *tf)
2863 {
2864   g_free(tf);
2865 }
2866
2867 static void ltt_tracefile_copy(LttTracefile *dest, const LttTracefile *src)
2868 {
2869   *dest = *src;
2870 }
2871
2872 /* Before library loading... */
2873
2874 static __attribute__((constructor)) void init(void)
2875 {
2876   LTT_FACILITY_NAME_HEARTBEAT = g_quark_from_string("heartbeat");
2877   LTT_EVENT_NAME_HEARTBEAT = g_quark_from_string("heartbeat");
2878   LTT_EVENT_NAME_HEARTBEAT_FULL = g_quark_from_string("heartbeat_full");
2879
2880   LTT_TRACEFILE_NAME_FACILITIES = g_quark_from_string("/control/facilities");
2881 }