Redirection to Serial I/O Driver

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#2689

From: John Dobbs
Date: Tue, 16 Oct 1990 12:35

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I am looking for some advice concerning DOS device drivers.  I have written 
a serial i/o port driver (AUX) in assembly language.  It is installed by 
DEVICE = xxx.sys and handles the RS-232 port on an interrupt basis.  I can 
successfully access the driver directly from C language routines as in 
    fgets( string, MAX_CHARS, stdaux) 
      or
    fputs( string, stdaux ).

The problem I have is in redirecting stdin from aux as in 
    c:> someprog < aux
By monitoring what the driver is receiving versus what DOS is giving to
someprog, it looks as though there is double buffering or non-recognition 
of end of line in that the characters received are out of sync.  The 
documentation I have described the template of a device driver but not the 
buffering that might be done by DOS.  Can someone give me a hint of what 
might be happening?  

Thanks,
John
jdobbs@mwunix.mitre.org

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!ns-mx!iowasp.physics.uiowa.edu!maverick.ksu.ksu.edu!zaphod.mps.ohio-state.edu!uwm.edu!bionet!agate!linus!linus!mwunix.mitre.org!jdobbs
From: jdobbs@mwunix.mitre.org (John Dobbs)
Newsgroups: comp.os.msdos.programmer
Subject: Redirection to Serial I/O Driver
Summary: Trouble redirecting stdin to aux
Keywords: Redirection, Serial I/O, Device Driver
Message-ID: <jdobbs.656080521@mwunix.mitre.org>
Date: 16 Oct 90 12:35:21 GMT
Sender: usenet@linus.mitre.org
Distribution: comp
Lines: 21