/* $Id: file.h,v 1.2 1996/01/16 14:22:28 chris Exp $ *//* * Copyright (c) 1982, 1986, 1989 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * *	@(#)file.h	7.10 (Berkeley) 6/4/91 */#include <sys/fcntl.h>#ifndef PROM#include <sys/unistd.h>#endif#ifdef KERNEL/* * Kernel descriptor table. * One entry for each open kernel vnode and socket. */struct file {	struct	file *f_filef;	/* list of active files */	struct	file **f_fileb;	/* list of active files */	short	f_flag;		/* see fcntl.h */#define	DTYPE_VNODE	1	/* file */#define	DTYPE_SOCKET	2	/* communications endpoint */	short	f_type;		/* descriptor type */	short	f_count;	/* reference count */	short	f_msgcount;	/* references from message queue */	struct	ucred *f_cred;	/* credentials associated with descriptor */	const struct fileops {		int	(*fo_read)	__P((struct file *fp, struct uio *uio,					    struct ucred *cred));		int	(*fo_write)	__P((struct file *fp, struct uio *uio,					    struct ucred *cred));		int	(*fo_ioctl)	__P((struct file *fp, int com,					    caddr_t data, struct proc *p));		int	(*fo_select)	__P((struct file *fp, int which,					    struct proc *p));		int	(*fo_close)	__P((struct file *fp, struct proc *p));	} *f_ops;	off_t	f_offset;	caddr_t	f_data;		/* vnode or socket */};extern struct file *filehead;	/* head of list of open files */extern int maxfiles;		/* kernel limit on number of open files */extern int nfiles;		/* actual number of open files */#endif /* KERNEL */