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Path: utzoo!mnetor!uunet!husc6!cmcl2!nrl-cmf!ames!ucbcad!ucbvax!CLUTX.CLARKSON.EDU!nelson
From: nelson@CLUTX.CLARKSON.EDU (Russell Nelson)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Berzerkeley sockets (and MS-DOG)
Message-ID: <8711111448.AA24644@clutx.clarkson.edu>
Date: Wed, 11-Nov-87 09:48:48 EST
Article-I.D.: clutx.8711111448.AA24644
Posted: Wed Nov 11 09:48:48 1987
Date-Received: Fri, 13-Nov-87 23:14:37 EST
References: <283548.871111.PAP4@AI.AI.MIT.EDU>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 22

Briefly, since many people might not be interested, the hack goes like this:

Open a socket:

	/* the NUL device is the head of the device chain */
	Open the NUL device with an FCB.
	If (version==2.x) NUL_device_header_ptr = fcb_reserved + 1;
	else if (version<3.20) NUL_device_header_ptr = fcb_reserved + 2;
	else NUL_device_header_ptr = (fcb_reserved + 2) + FCB_MAGIC;
	Find the end of the device chain.
	Link your device into the device chain.
	Open the device.
	Set it to raw mode using IOCTL.	/* takes care of a MS-DOG 2.x bug. */
					/* also sends entire block of data */
					/* to the device. */
	return the handle as your socket handle.

Close a socket:
	close the socket handle.
	unlink the created device from the device chain.

There are a few details missing, but that's the gist of it.