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From: dlnash@ut-ngp.UUCP (Donald L. Nash)
Newsgroups: net.micro.pc
Subject: Re: How to tell if stdout is console
Message-ID: <3173@ut-ngp.UUCP>
Date: Mon, 7-Apr-86 11:11:33 EST
Article-I.D.: ut-ngp.3173
Posted: Mon Apr  7 11:11:33 1986
Date-Received: Thu, 10-Apr-86 00:34:02 EST
References: <299@bnrmtv.UUCP>
Distribution: net
Organization: UTexas Computation Center, Austin, Texas
Lines: 33


> In writing a number of utilities it has become desirable to be able to
> tell automatically if stdout has been redirected or not.  For example
> in writing a directory lister which uses color through the BIOS it
> should automatically go back to normal DOS I/O if the device is not
> the console.  I can do this through fstat or isatty in MSC 3.0 if the
> redirected device is a file and not a device, but I can't tell if the
> user has redirected stdout to the printer or another device.
>
> Any ideas?
> -- 
>
> Glenn Connery, Bell Northern Research, Mountain View, CA
> {hplabs,amdahl,3comvax}!bnrmtv!connery


Use the IOCTL DOS function.  Look it up in the DOS manual, it is
function 0x44.  You want subfunction 0.  I needed to determine the same
thing about stdin at wone time.  This will do it.  I believe that MSC
3.0 will allow you to make direct calls to DOS, won't it?  I haven't
used MSC, but in CII C86, there is a function sysint21() which allows
you to make calls to DOS.

Hope this helps...

					Don Nash

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