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From: ekalenda@cup.portal.com (Edward John Kalenda)
Newsgroups: comp.os.msdos.programmer
Subject: Re: Device Drivers
Message-ID: <36152@cup.portal.com>
Date: 22 Nov 90 07:53:46 GMT
References: <1990Nov21.205117.2778@watserv1.waterloo.edu>
Distribution: na
Organization: The Portal System (TM)
Lines: 16

> Hi, I know that I can do this, but for the life of me I can't figure out
> how.  
> 
> How do I identify a give filename as a name used by a device driver.
> i.e. lpt1, com1 and the sorts?
> 
> Inquiring minds and that stuff,
> -- 
> Jack a.k.a. Wildside   ... 2nd regeneration of a Time Lord

Open the file using DOS function 0x3d then use function 0x44 subfunction
0x00. The return will tell you if it's a file or a device. If a device,
there's some more bits to tell you if it's stdin, stdout, etc.

Ed
ekalenda@cup.portal.com