www.pudn.com > tcpipsim.rar > file.h

/* 
 * 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	8.1 (Berkeley) 6/2/93 
 */ 
 
#include  
#include  
 
#ifdef KERNEL 
struct proc; 
struct uio; 
 
/* 
 * 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 */ 
	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 */