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- /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
- /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
- /*
- * 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
- */
-
- #ifndef _SYS_FILE_H_
- #define _SYS_FILE_H_
-
- #include <sys/fcntl.h>
- #include <sys/unistd.h>
-
- #ifdef KERNEL
- #include <sys/queue.h>
- #include <sys/cdefs.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_PSXSHM 3 /* POSIX Shared memory */
- #define DTYPE_PSXSEM 4 /* POSIX Semaphores */
- 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, u_long com,
- caddr_t data, struct proc *p));
- int (*fo_select) __P((struct file *fp, int which,
- void * wql, 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 */
- };
-
- LIST_HEAD(filelist, file);
- extern struct filelist 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 */
-
- __BEGIN_DECLS
- int fref __P((struct file *)); /* take a reference on file pointer */
- int frele __P((struct file *)); /* release a reference on file pointer */
- int fcount __P((struct file *)); /* returns the reference count */
- __END_DECLS
-
- #endif /* KERNEL */
-
- #endif /* !_SYS_FILE_H_ */
-