Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!unisoft!gethen!bdt!david
From: david@bdt.UUCP (David Beckemeyer)
Newsgroups: comp.sys.atari.st
Subject: Re: File handle info
Message-ID: <324@bdt.UUCP>
Date: 26 May 88 17:35:01 GMT
References: <447@ruuinf.UUCP>
Reply-To: david@bdt.UUCP (David Beckemeyer)
Organization: Beckemeyer Development Tools, Oakland, CA
Lines: 29

In article <447@ruuinf.UUCP> piet@ruuinf.UUCP (Piet van Oostrum) writes:
>Is there a way to find out what kind of file is connected to a file handle,
>e.g. disk file/keyboard/screen.
>In some old Atari doc I found F_ioctl, but that doesn't seem to be
>implemented. The problems come up when you run a program with stdin/stdout
>redirected by a shell.
>
>-- 
>Piet van Oostrum, Dept of Computer Science, University of Utrecht
>Padualaan 14, P.O. Box 80.089, 3508 TB Utrecht, The Netherlands
>Telephone: +31-30-531806              UUCP: ...!mcvax!ruuinf!piet


Micro RTX added this feature to TOS.  There are two calls to determine
characteristics of a file handle.  Here's the simplest way:

	type = Ftype(fd);

The value returned by this call tells you what the handle is:

	0-15	The BIOS level device number (e.g. 2=console)
	16	A regular file
	17	A pipe

Maybe a future versiaon of Atari TOS will also support this.
-- 
David Beckemeyer			| "Reckon the Ball's plumb open now,
Beckemeyer Development Tools		| and it's `swing partner'!"
478 Santa Clara Ave, Oakland, CA 94610	|    - Unnamed Cowboy, upon seeing
UUCP: ...!ihnp4!hoptoad!bdt!david 	|      heap many Indians approaching