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Synopsis:
    #include <io.h>
    int isatty( int handle );

Description:
    The isatty function tests if the opened file or device referenced by the
    file handle handle is a character device (for example, a console,
    printer or port).

Returns:
    The isatty function returns zero if the device or file is not a
    character device; otherwise, a non-zero value is returned.  When an
    error has occurred,  errno contains a value indicating the type of error
    that has been detected.

Example:
    #include <stdio.h>
    #include <io.h>

    void main()
      {
        printf( "stdin is a %stty\n",
                ( isatty( fileno( stdin ) ) )
                ? "" : "not " );
      }

Classification:
    POSIX 1003.1

Systems:
    All, Netware
See Also:
    open