83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)file.h 8.1 (Berkeley) 6/2/93
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* $Id: file.h,v 1.2 1994/08/02 07:52:58 davidg Exp $
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*/
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#ifndef _SYS_FILE_H_
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#define _SYS_FILE_H_
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#include <sys/fcntl.h>
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#include <sys/unistd.h>
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#ifdef KERNEL
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struct proc;
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struct uio;
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/*
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* Kernel descriptor table.
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* One entry for each open kernel vnode and socket.
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*/
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struct file {
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struct file *f_filef; /* list of active files */
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struct file **f_fileb; /* list of active files */
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short f_flag; /* see fcntl.h */
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#define DTYPE_VNODE 1 /* file */
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#define DTYPE_SOCKET 2 /* communications endpoint */
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short f_type; /* descriptor type */
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short f_count; /* reference count */
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short f_msgcount; /* references from message queue */
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struct ucred *f_cred; /* credentials associated with descriptor */
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struct fileops {
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int (*fo_read) __P((struct file *fp, struct uio *uio,
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struct ucred *cred));
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int (*fo_write) __P((struct file *fp, struct uio *uio,
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struct ucred *cred));
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int (*fo_ioctl) __P((struct file *fp, int com,
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caddr_t data, struct proc *p));
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int (*fo_select) __P((struct file *fp, int which,
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struct proc *p));
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int (*fo_close) __P((struct file *fp, struct proc *p));
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} *f_ops;
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off_t f_offset;
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caddr_t f_data; /* vnode or socket */
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};
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extern struct file *filehead; /* head of list of open files */
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extern int maxfiles; /* kernel limit on number of open files */
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extern int nfiles; /* actual number of open files */
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#endif /* KERNEL */
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#endif
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