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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
23: /*
24: * Copyright (c) 1982, 1986, 1989, 1993
25: * The Regents of the University of California. All rights reserved.
26: *
27: * Redistribution and use in source and binary forms, with or without
28: * modification, are permitted provided that the following conditions
29: * are met:
30: * 1. Redistributions of source code must retain the above copyright
31: * notice, this list of conditions and the following disclaimer.
32: * 2. Redistributions in binary form must reproduce the above copyright
33: * notice, this list of conditions and the following disclaimer in the
34: * documentation and/or other materials provided with the distribution.
35: * 3. All advertising materials mentioning features or use of this software
36: * must display the following acknowledgement:
37: * This product includes software developed by the University of
38: * California, Berkeley and its contributors.
39: * 4. Neither the name of the University nor the names of its contributors
40: * may be used to endorse or promote products derived from this software
41: * without specific prior written permission.
42: *
43: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53: * SUCH DAMAGE.
54: *
55: * @(#)file.h 8.3 (Berkeley) 1/9/95
56: */
57:
58: #ifndef _SYS_FILE_H_
59: #define _SYS_FILE_H_
60:
61: #include <sys/fcntl.h>
62: #include <sys/unistd.h>
63:
64: #ifdef KERNEL
65: #include <sys/queue.h>
66:
67: struct proc;
68: struct uio;
69:
70: /*
71: * Kernel descriptor table.
72: * One entry for each open kernel vnode and socket.
73: */
74: struct file {
75: LIST_ENTRY(file) f_list;/* list of active files */
76: short f_flag; /* see fcntl.h */
77: #define DTYPE_VNODE 1 /* file */
78: #define DTYPE_SOCKET 2 /* communications endpoint */
79: #define DTYPE_PSXSHM 3 /* POSIX Shared memory */
80: #define DTYPE_PSXSEM 4 /* POSIX Semaphores */
81: short f_type; /* descriptor type */
82: short f_count; /* reference count */
83: short f_msgcount; /* references from message queue */
84: struct ucred *f_cred; /* credentials associated with descriptor */
85: struct fileops {
86: int (*fo_read) __P((struct file *fp, struct uio *uio,
87: struct ucred *cred));
88: int (*fo_write) __P((struct file *fp, struct uio *uio,
89: struct ucred *cred));
90: int (*fo_ioctl) __P((struct file *fp, u_long com,
91: caddr_t data, struct proc *p));
92: int (*fo_select) __P((struct file *fp, int which,
93: struct proc *p));
94: int (*fo_close) __P((struct file *fp, struct proc *p));
95: } *f_ops;
96: off_t f_offset;
97: caddr_t f_data; /* vnode or socket */
98: };
99:
100: LIST_HEAD(filelist, file);
101: extern struct filelist filehead; /* head of list of open files */
102: extern int maxfiles; /* kernel limit on number of open files */
103: extern int nfiles; /* actual number of open files */
104:
105: #endif /* KERNEL */
106:
107: #endif /* !_SYS_FILE_H_ */
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