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file.h
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file.h
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/*
* 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
* $Id: file.h,v 1.16.2.1 1999/05/05 22:53:02 dt Exp $
*/
#ifndef _SYS_FILE_H_
#define _SYS_FILE_H_
#ifndef KERNEL
#include <sys/fcntl.h>
#include <sys/unistd.h>
#endif
#ifdef KERNEL
#include <sys/queue.h>
struct proc;
struct uio;
/*
* Kernel descriptor table.
* One entry for each open kernel vnode and socket.
*/
struct file {
LIST_ENTRY(file) f_list;/* list of active files */
short f_flag; /* see fcntl.h */
#define DTYPE_VNODE 1 /* file */
#define DTYPE_SOCKET 2 /* communications endpoint */
#define DTYPE_PIPE 3 /* pipe */
#define DTYPE_FIFO 4 /* fifo (named pipe) */
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 flags));
int (*fo_write) __P((struct file *fp, struct uio *uio,
struct ucred *cred, int flags));
#define FOF_OFFSET 1
int (*fo_ioctl) __P((struct file *fp, u_long com,
caddr_t data, struct proc *p));
int (*fo_poll) __P((struct file *fp, int events,
struct ucred *cred, struct proc *p));
int (*fo_close) __P((struct file *fp, struct proc *p));
} *f_ops;
int f_seqcount; /*
* count of sequential accesses -- cleared
* by most seek operations.
*/
off_t f_nextread; /*
* offset of next expected read
*/
off_t f_offset;
caddr_t f_data; /* vnode or socket */
};
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_FILE);
#endif
LIST_HEAD(filelist, file);
extern struct filelist filehead; /* head of list of open files */
extern struct fileops vnops;
extern int maxfiles; /* kernel limit on number of open files */
extern int maxfilesperproc; /* per process limit on number of open files */
extern int nfiles; /* actual number of open files */
#endif /* KERNEL */
#endif /* !SYS_FILE_H */