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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
78ed81a3 | 33 | * from: @(#)file.h 7.10 (Berkeley) 6/4/91 |
34 | * $Id$ | |
15637ed4 RG |
35 | */ |
36 | ||
37 | #include <sys/fcntl.h> | |
38 | #include <sys/unistd.h> | |
39 | ||
40 | #ifdef KERNEL | |
41 | /* | |
42 | * Kernel descriptor table. | |
43 | * One entry for each open kernel vnode and socket. | |
44 | */ | |
45 | struct file { | |
46 | struct file *f_filef; /* list of active files */ | |
47 | struct file **f_fileb; /* list of active files */ | |
48 | short f_flag; /* see fcntl.h */ | |
49 | #define DTYPE_VNODE 1 /* file */ | |
50 | #define DTYPE_SOCKET 2 /* communications endpoint */ | |
51 | short f_type; /* descriptor type */ | |
52 | short f_count; /* reference count */ | |
53 | short f_msgcount; /* references from message queue */ | |
54 | struct ucred *f_cred; /* credentials associated with descriptor */ | |
55 | struct fileops { | |
56 | int (*fo_read) __P((struct file *fp, struct uio *uio, | |
57 | struct ucred *cred)); | |
58 | int (*fo_write) __P((struct file *fp, struct uio *uio, | |
59 | struct ucred *cred)); | |
60 | int (*fo_ioctl) __P((struct file *fp, int com, | |
61 | caddr_t data, struct proc *p)); | |
62 | int (*fo_select) __P((struct file *fp, int which, | |
63 | struct proc *p)); | |
64 | int (*fo_close) __P((struct file *fp, struct proc *p)); | |
65 | } *f_ops; | |
66 | off_t f_offset; | |
67 | caddr_t f_data; /* vnode or socket */ | |
68 | }; | |
69 | ||
70 | extern struct file *filehead; /* head of list of open files */ | |
71 | extern int maxfiles; /* kernel limit on number of open files */ | |
72 | extern int nfiles; /* actual number of open files */ | |
73 | ||
74 | #endif /* KERNEL */ |