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   1.
     ½ñÌìÉϰà×·Á˸öÎÊÌ⣬׷Á˰ëÌì·¢ÏÖÊÇfopen´ò¿ª´óÓÚ2GµÄÎļþÓÐÎÊÌâ¡£
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  //   ¶¨Òåºê£¬Ê¹µÃ¿ÉÒÔ´¦Àí´óÎļþ£¨>4GB£©  
  #undef   _FILE_OFFSET_BITS  
  #define   _FILE_OFFSET_BITS   64  
  #include   <unistd.h>  
  #include   <dirent.h>
fopen64()
2.
º¯Êý£ºperror
NAME
       perror - print a system error message
SYNOPSIS
       #include <stdio.h>
       void perror(const char *s);
       #include <errno.h>
       const char *sys_errlist[];
       int sys_nerr;
       int errno;


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