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From: connery@bnrmtv.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: ioctl on msdos device drivers
Message-ID: <1620@bnrmtv.UUCP>
Date: Sun, 12-Apr-87 16:57:12 EST
Article-I.D.: bnrmtv.1620
Posted: Sun Apr 12 16:57:12 1987
Date-Received: Tue, 14-Apr-87 00:57:03 EST
References: <959@rocksvax.UUCP> <4490002@hpcvck.HP>
Organization: Bell Northern Research, Mtn. View, CA
Lines: 35

> I would also be interested in what people have to say about
> setting ioctl for devices like printers.  I have been trying
> to write a graphics dump routine for my MSDOS computer (not IBM
> compatible), and was having trouble.  I was opening the printer
> as a binary device, but MSDOS was *not* treating like a binary
> device/file.  If I wrote the info to a file first, then did
> COPY <fname> PRN: /B, it printed the info fine.
> 

	void SetRaw(fd)
	int fd;
	{
	   union REGS r;

	   r.h.ah = 0x44;
	   r.x.bx = fd;
	   r.h.al = 0;
	   intdos(&r, &r);

	   if (r.x.dx & 0x80) {
		r.h.ah = 0x44;
		r.x.bx = fd;
		r.h.al = 1;
		r.x.dx |= 0x20;
		r.x.dx &= 0xFF;
		intdos(&r, &r);
	   }
	}

Basically, this just sets raw if the handle passed is a device, and sets
raw mode if it is.  Works fine on network devices too.
-- 

Glenn Connery, Bell Northern Research, Mountain View, CA
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