Xref: utzoo comp.unix.questions:11914 comp.unix.xenix:5140
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!gatech!gitpyr!stat!curci
From: curci@stat.uucp (Ray Curci (scri))
Newsgroups: comp.unix.questions,comp.unix.xenix
Subject: Re: How to determine file being redirected to in C
Keywords: redirection
Message-ID: <7419@pyr.gatech.EDU>
Date: 28 Feb 89 04:14:21 GMT
References: <10@sherpa.UUCP>
Sender: news@pyr.gatech.EDU
Reply-To: curci@stat.fsu.edu (Ray Curci (scri))
Distribution: na
Organization: Dept. of Statistics, Florida State Univ.
Lines: 15

In article <10@sherpa.UUCP> rac@sherpa.UUCP (Roger A. Cornelius) writes:
>...  Anyway, can someone tell me how to determine (in C)
>if output is being redirected, or more precisely, how to determine the
>file output is being redirected to.  
>Roger      rac@sherpa
>           uunet!sherpa!rac

You may want to investigate the isatty() function call.  I believe that
you can use something like:  isatty(stdout)  which will tell you if
standard out is going to a terminal (the usual case), or if it has been
redirected via a pipe or into a file.

ray curci
florida state university supercomputer institute
curci@stat.fsu.edu,  curci@nu.cs.fsu.edu