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Synopsis:
    #include <stdio.h>
    FILE *freopen( const char *filename,
                   const char *mode,
                   FILE *fp );

Description:
    The stream located by the  fp pointer is closed.  The freopen function
    opens the file whose name is the string pointed to by filename, and
    associates a stream with it.  The stream information is placed in the
    structure located by the fp pointer.

    The argument mode is described in the description of the  fopen
    function.

Returns:
    The  freopen function returns a pointer to the object controlling the
    stream.  This pointer must be passed as a parameter to subsequent
    functions for performing operations on the file.  If the open operation
    fails,  freopen returns NULL.  When an error has occurred,  errno
    contains a value indicating the type of error that has been detected.

See Also:
    fclose, fcloseall, fdopen, fopen, _fsopen

Example:
    #include <stdio.h>

    void main()
      {
        FILE *fp;
        int c;

        fp = freopen( "file", "r", stdin );
        if( fp != NULL ) {
          while( (c = fgetchar()) != EOF )
            fputchar(c);
          fclose( fp );
        }
      }

Classification:
    ANSI

Systems:
    All