/*	@(#)fifo.h	4.1	(ULTRIX)	7/2/90	*//************************************************************************ *									* *			Copyright (c) 1986 by				* *		Digital Equipment Corporation, Maynard, MA		* *			All rights reserved.				* *									* *   This software is furnished under a license and may be used and	* *   copied  only  in accordance with the terms of such license and	* *   with the  inclusion  of  the  above  copyright  notice.   This	* *   software  or  any  other copies thereof may not be provided or	* *   otherwise made available to any other person.  No title to and	* *   ownership of the software is hereby transferred.			* *									* *   This software is  derived  from  software  received  from  the	* *   University    of   California,   Berkeley,   and   from   Bell	* *   Laboratories.  Use, duplication, or disclosure is  subject  to	* *   restrictions  under  license  agreements  with  University  of	* *   California and with AT&T.						* *									* *   The information in this software is subject to change  without	* *   notice  and should not be construed as a commitment by Digital	* *   Equipment Corporation.						* *									* *   Digital assumes no responsibility for the use  or  reliability	* *   of its software on equipment which is not supplied by Digital.	* *									* ************************************************************************//* * Copyright (c) 1986 by Sun Microsystems, Inc. *//************************************************************************ *			Modification History * * 11-Jul-88 -- prs *	Added two defines : IF_WASYNC IF_RASYNC. * * 27-Apr-88 -- prs *	Added two defines : IF_WCOLL IF_RCOLL. * * 06-Apr-88 -- prs *	Increased the total number of bytes to be allocated for all *	fifos. * * 10-Feb-88 -- prs *	New fifo code. * ************************************************************************/#ifdef KERNEL/* *	Configuration Constants *	SHOULD BE SETTABLE BY "/etc/config". */#define FIFOBUF	4092	/* max # bytes stored in a fifo */#define FIFOMAX ~0	/* largest size of a single write to a fifo */#define FIFOBSZ 4092	/* number of data bytes in each fifo data buffer */#define FIFOMNB FIFOBUF*10	/* total # bytes allowed for all fifos *//* *	Implementation Constants. */#define IFIR	  0x001	/* # blocked readers */#define IFIW	  0x002	/* # blocked writers */#define IF_WCOLL  0x004	/* Collision for a write select */#define IF_RCOLL  0x008	/* Collision for a read select */#define IF_WASYNC 0x020   /* SIGIO enabled for write side */#define IF_RASYNC 0x040   /* SIGIO enabled for read side */struct fifo_bufhdr {	struct fifo_bufhdr *fb_next;	char fb_data[1];};#define FIFO_BUFHDR_SIZE (sizeof(struct fifo_bufhdr *))#define FIFO_BUFFER_SIZE (FIFO_BUFHDR_SIZE + fifoinfo.fifobsz)/* *	Fifo information structure. */struct fifoinfo {	int	fifobuf,	/* max # bytes stored in a fifo */		fifomax,	/* largest size of a single write to a fifo */		fifobsz,	/* # of data bytes in each fifo data buffer */		fifomnb;	/* max # bytes reserved for all fifos */};#define PIPE_BUF (fifoinfo.fifobuf)#define PIPE_MAX (fifoinfo.fifomax)#define PIPE_BSZ (fifoinfo.fifobsz)#define PIPE_MNB (fifoinfo.fifomnb)int fifo_alloc;			/* total number of bytes reserved for fifos */struct fifoinfo	fifoinfo = {4096, ~0, 4096, 4096000};	 /* fifo parameters */#endif KERNEL