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Annotation of kernel/bsd/sys/file.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1982, 1986, 1989, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)file.h      8.3 (Berkeley) 1/9/95
        !            59:  */
        !            60: 
        !            61: #ifndef _SYS_FILE_H_
        !            62: #define        _SYS_FILE_H_
        !            63: 
        !            64: #include <sys/fcntl.h>
        !            65: #include <sys/unistd.h>
        !            66: 
        !            67: #ifdef _KERNEL
        !            68: #include <sys/queue.h>
        !            69: 
        !            70: struct proc;
        !            71: struct uio;
        !            72: 
        !            73: /*
        !            74:  * Kernel descriptor table.
        !            75:  * One entry for each open kernel vnode and socket.
        !            76:  */
        !            77: struct file {
        !            78:        LIST_ENTRY(file) f_list;/* list of active files */
        !            79:        short   f_flag;         /* see fcntl.h */
        !            80: #define        DTYPE_VNODE     1       /* file */
        !            81: #define        DTYPE_SOCKET    2       /* communications endpoint */
        !            82:        short   f_type;         /* descriptor type */
        !            83:        short   f_count;        /* reference count */
        !            84:        short   f_msgcount;     /* references from message queue */
        !            85:        struct  ucred *f_cred;  /* credentials associated with descriptor */
        !            86:        struct  fileops {
        !            87:                int     (*fo_read)      __P((struct file *fp, struct uio *uio,
        !            88:                                            struct ucred *cred));
        !            89:                int     (*fo_write)     __P((struct file *fp, struct uio *uio,
        !            90:                                            struct ucred *cred));
        !            91:                int     (*fo_ioctl)     __P((struct file *fp, u_long com,
        !            92:                                            caddr_t data, struct proc *p));
        !            93:                int     (*fo_select)    __P((struct file *fp, int which,
        !            94:                                            struct proc *p));
        !            95:                int     (*fo_close)     __P((struct file *fp, struct proc *p));
        !            96:        } *f_ops;
        !            97:        off_t   f_offset;
        !            98:        caddr_t f_data;         /* vnode or socket */
        !            99: };
        !           100: 
        !           101: LIST_HEAD(filelist, file);
        !           102: extern struct filelist filehead;       /* head of list of open files */
        !           103: extern int maxfiles;                   /* kernel limit on number of open files */
        !           104: extern int nfiles;                     /* actual number of open files */
        !           105: 
        !           106: #endif /* _KERNEL */
        !           107: 
        !           108: #endif /* !_SYS_FILE_H_ */

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