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Overview
Comment:Add retry logic to GetFileAttributesEx() on windows.
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Timelines: family | ancestors | experimental
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SHA1: 1cca9a49f2612c0c2695e63a429ce4bc1703d802
User & Date: drh 2011-04-15 13:29:45.824
Context
2011-04-15
13:29
Add retry logic to GetFileAttributesEx() on windows. (Closed-Leaf check-in: 1cca9a49f2 user: drh tags: experimental)
12:36
Make sure the unix backend returns SQLITE_FULL if write() fails with an ENOSPC error code. (check-in: 721e3c16b3 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/os_win.c.
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  SimulateIOError( return SQLITE_IOERR_ACCESS; );
  zConverted = convertUtf8Filename(zFilename);
  if( zConverted==0 ){
    return SQLITE_NOMEM;
  }
  if( isNT() ){


    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
    memset(&sAttrData, 0, sizeof(sAttrData));


    if( GetFileAttributesExW((WCHAR*)zConverted,
                             GetFileExInfoStandard, 
                             &sAttrData) ){


      /* For an SQLITE_ACCESS_EXISTS query, treat a zero-length file
      ** as if it does not exist.
      */
      if(    flags==SQLITE_ACCESS_EXISTS
          && sAttrData.nFileSizeHigh==0 
          && sAttrData.nFileSizeLow==0 ){
        attr = INVALID_FILE_ATTRIBUTES;








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  SimulateIOError( return SQLITE_IOERR_ACCESS; );
  zConverted = convertUtf8Filename(zFilename);
  if( zConverted==0 ){
    return SQLITE_NOMEM;
  }
  if( isNT() ){
    DWORD rc;
    int retryCnt = 0;
    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
    memset(&sAttrData, 0, sizeof(sAttrData));
    do{
      if( retryCnt>0 ) Sleep(10*(retryCnt-1));
      rc = GetFileAttributesExW((WCHAR*)zConverted,
                                GetFileExInfoStandard, 
                                &sAttrData);
    }while( rc!=0 && (retryCnt++)<3 && GetLastError()==ERROR_ACCESS_DENIED );
    if( rc ){
      /* For an SQLITE_ACCESS_EXISTS query, treat a zero-length file
      ** as if it does not exist.
      */
      if(    flags==SQLITE_ACCESS_EXISTS
          && sAttrData.nFileSizeHigh==0 
          && sAttrData.nFileSizeLow==0 ){
        attr = INVALID_FILE_ATTRIBUTES;
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