EPGInfo_CreateCache.c

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#include                <stdio.h>
#include                <stdlib.h>
#include                <fcntl.h>
#include                <unistd.h>
#include                <sys/mman.h>
#include                <sys/stat.h>
#include                "FBLib_EPG.h"
 
bool EPGInfo_CreateCache(int NrRecords)
{
  TRACEENTER();
 
  extern dword __tap_ud__;
 
  TAP_SPrint(EPGCacheFile, "/mnt/hd/tmp/EPGCache_%x.bin", __tap_ud__);
 
  if(EPGInfoCacheFile) EPGInfo_DestroyCache();
 
  EPGInfoCacheSize = NrRecords * sizeof(TYPE_EPGInfo);
 
  //Delete the old cache
  unlink(EPGCacheFile);
 
  mkdir("/mnt/hd/tmp", 0777);
  EPGInfoCacheFile = open(EPGCacheFile, O_RDWR | O_CREAT | O_TRUNC, (mode_t)0600);
 
  if(EPGInfoCacheFile == -1)
  {
    LogEntryFBLibPrintf(TRUE, "EPGInfo: failed to create the memory mapped EPG cache");
 
    TRACEEXIT();
    return FALSE;
  }
 
  //Increase the size of the cache as needed
  if(lseek(EPGInfoCacheFile, EPGInfoCacheSize, SEEK_SET) == -1)
  {
    LogEntryFBLibPrintf(TRUE, "EPGInfo: failed to stretch the memory mapped EPG cache");
    close(EPGInfoCacheFile);
    unlink(EPGCacheFile);
 
    TRACEEXIT();
    return FALSE;
  }
  write(EPGInfoCacheFile, "", 1);
 
  //Map the memory
  EPGInfoCacheMap = mmap(0, EPGInfoCacheSize, PROT_READ | PROT_WRITE, MAP_SHARED, EPGInfoCacheFile, 0);
  if(EPGInfoCacheMap == MAP_FAILED)
  {
    LogEntryFBLibPrintf(TRUE, "EPGInfo: failed to memory map the EPG cache file");
    close(EPGInfoCacheFile);
    unlink(EPGCacheFile);
 
    TRACEEXIT();
    return FALSE;
  }
 
  EPGInfoCache = (TYPE_EPGInfo*)EPGInfoCacheMap;
 
  TRACEEXIT();
  return TRUE;
}