/*	$NetBSD: file.h,v 1.22 2000/02/01 01:22:45 assar Exp $	*//* * Copyright (c) 1982, 1986, 1989, 1993 *	The 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	8.3 (Berkeley) 1/9/95 */#ifndef _SYS_FILE_H_#define _SYS_FILE_H_#include <sys/fcntl.h>#include <sys/unistd.h>#ifdef _KERNEL#include <sys/queue.h>struct proc;struct uio;struct iovec;/* * Kernel descriptor table. * One entry for each open kernel vnode and socket. */struct file {	LIST_ENTRY(file) f_list;/* list of active files */	int	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 */	short	f_pad0;		/* spare */	struct	ucred *f_cred;	/* credentials associated with descriptor */	struct	fileops {		int	(*fo_read)	__P((struct file *fp, off_t *offset,					    struct uio *uio,					    struct ucred *cred, int flags));		int	(*fo_write)	__P((struct file *fp, off_t *offset,					    struct uio *uio,					    struct ucred *cred, int flags));		int	(*fo_ioctl)	__P((struct file *fp, u_long com,					    caddr_t data, struct proc *p));		int	(*fo_fcntl)	__P((struct file *fp, u_int com,					    caddr_t data, struct proc *p));		int	(*fo_poll)	__P((struct file *fp, int events,					    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 */	int	f_iflags;	/* internal flags */	int	f_usecount;	/* number active users */};#define	FIF_WANTCLOSE		0x01	/* a close is waiting for usecount */#ifdef DIAGNOSTIC#define	FILE_USE_CHECK(fp, str)						\do {									\	if ((fp)->f_usecount < 0)					\		panic(str);						\} while (0)#else#define	FILE_USE_CHECK(fp, str)		/* nothing */#endif#define	FILE_USE(fp)							\do {									\	(fp)->f_usecount++;						\	FILE_USE_CHECK((fp), "f_usecount overflow");			\} while (0)#define	FILE_UNUSE(fp, p)						\do {									\	if ((fp)->f_iflags & FIF_WANTCLOSE) {				\		/* Will drop usecount. */				\		(void) closef((fp), (p));				\	} else {							\		(fp)->f_usecount--;					\		FILE_USE_CHECK((fp), "f_usecount underflow");		\	}								\} while (0)/* * Flags for fo_read and fo_write. */#define	FOF_UPDATE_OFFSET	0x01	/* update the file offset */LIST_HEAD(filelist, file);extern struct filelist 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 */extern struct fileops vnops;		/* vnode operations for files */int	dofileread __P((struct proc *, int, struct file *, void *, size_t,	    off_t *, int, register_t *));int	dofilewrite __P((struct proc *, int, struct file *, const void *,	    size_t, off_t *, int, register_t *));int	dofilereadv __P((struct proc *, int, struct file *,	    const struct iovec *, int, off_t *, int, register_t *));int	dofilewritev __P((struct proc *, int, struct file *,	    const struct iovec *, int, off_t *, int, register_t *));void	finit __P((void));#endif /* _KERNEL */#endif /* _SYS_FILE_H_ */