file.h revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
1N/A/*
1N/A * Copyright (c) 1982, 1986, 1989, 1993
1N/A * The Regents of the University of California. All rights reserved.
1N/A *
1N/A * Redistribution and use in source and binary forms, with or without
1N/A * modification, are permitted provided that the following conditions
1N/A * are met:
1N/A * 1. Redistributions of source code must retain the above copyright
1N/A * notice, this list of conditions and the following disclaimer.
1N/A * 2. Redistributions in binary form must reproduce the above copyright
1N/A * notice, this list of conditions and the following disclaimer in the
1N/A * documentation and/or other materials provided with the distribution.
1N/A * 3. All advertising materials mentioning features or use of this software
1N/A * must display the following acknowledgement:
1N/A * This product includes software developed by the University of
1N/A * California, Berkeley and its contributors.
1N/A * 4. Neither the name of the University nor the names of its contributors
1N/A * may be used to endorse or promote products derived from this software
1N/A * without specific prior written permission.
1N/A *
1N/A * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1N/A * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1N/A * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1N/A * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1N/A * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1N/A * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1N/A * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1N/A * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1N/A * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1N/A * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1N/A * SUCH DAMAGE.
1N/A *
1N/A * @(#)file.h 8.3 (Berkeley) 1/9/95
1N/A * $Id: file.h,v 1.1.1.1 2006/05/30 06:12:53 hhzhou Exp $
1N/A */
1N/A
1N/A#ifndef _SYS_FILE_H_
1N/A#define _SYS_FILE_H_
1N/A
1N/A#ifndef KERNEL
1N/A#include <sys/fcntl.h>
1N/A#include <sys/unistd.h>
1N/A#endif
1N/A
1N/A#ifdef KERNEL
1N/A#include <sys/queue.h>
1N/A
1N/Astruct proc;
1N/Astruct uio;
1N/A
1N/A/*
1N/A * Kernel descriptor table.
1N/A * One entry for each open kernel vnode and socket.
1N/A */
1N/Astruct file {
1N/A LIST_ENTRY(file) f_list;/* list of active files */
1N/A 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 */