* 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
* 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
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* 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
* @(#)file.h 8.1 (Berkeley) 6/2/93
* Kernel descriptor table.
* One entry for each open kernel vnode and socket.
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 */
int (*fo_read
) __P((struct file
*fp
, struct uio
*uio
,
int (*fo_write
) __P((struct file
*fp
, struct uio
*uio
,
int (*fo_ioctl
) __P((struct file
*fp
, int com
,
caddr_t data
, struct proc
*p
));
int (*fo_select
) __P((struct file
*fp
, int which
,
int (*fo_close
) __P((struct file
*fp
, struct proc
*p
));
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 */