Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!yale!mintaka!bloom-beacon!world!jstone
From: jstone@world.std.com (Jeffrey R Stone)
Newsgroups: comp.os.msdos.programmer
Subject: Re: How to detect redirection?
Message-ID: <1990Aug8.030621.24021@world.std.com>
Date: 8 Aug 90 03:06:21 GMT
References: <1426@wet.UUCP> <1990Aug8.012021.19429@ucselx.sdsu.edu>
Distribution: na
Organization: The World @ Software Tool & Die
Lines: 14

lai@math.sdsu.edu (Henry Lai ) writes:

>In article <1426@wet.UUCP> naga@wet.UUCP (Peter Davidson) writes:
    [ question about how to detect that stdout has been redirected ]

>	isatty (fileno (stdout))
>will return zero if stdout has been redirected to a file. See the
>reference to isatty in your run-time library reference.

According to Turbo C's library reference, isatty() returns TRUE if 
it argument file pointer is a character devuce - A tty - not necessarily
THE tty.

-jeff-