projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b688fc87 WJ |
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 | * | |
| 33 | * @(#)file.h 7.10 (Berkeley) 6/4/91 | |
| 34 | */ | |
| 35 | ||
| 36 | #include <sys/fcntl.h> | |
| 37 | #include <sys/unistd.h> | |
| 38 | ||
| 39 | #ifdef KERNEL | |
| 40 | /* | |
| 41 | * Kernel descriptor table. | |
| 42 | * One entry for each open kernel vnode and socket. | |
| 43 | */ | |
| 44 | struct file { | |
| 45 | struct file *f_filef; /* list of active files */ | |
| 46 | struct file **f_fileb; /* list of active files */ | |
| 47 | short f_flag; /* see fcntl.h */ | |
| 48 | #define DTYPE_VNODE 1 /* file */ | |
| 49 | #define DTYPE_SOCKET 2 /* communications endpoint */ | |
| 50 | short f_type; /* descriptor type */ | |
| 51 | short f_count; /* reference count */ | |
| 52 | short f_msgcount; /* references from message queue */ | |
| 53 | struct ucred *f_cred; /* credentials associated with descriptor */ | |
| 54 | struct fileops { | |
| 55 | int (*fo_read) __P((struct file *fp, struct uio *uio, | |
| 56 | struct ucred *cred)); | |
| 57 | int (*fo_write) __P((struct file *fp, struct uio *uio, | |
| 58 | struct ucred *cred)); | |
| 59 | int (*fo_ioctl) __P((struct file *fp, int com, | |
| 60 | caddr_t data, struct proc *p)); | |
| 61 | int (*fo_select) __P((struct file *fp, int which, | |
| 62 | struct proc *p)); | |
| 63 | int (*fo_close) __P((struct file *fp, struct proc *p)); | |
| 64 | } *f_ops; | |
| 65 | off_t f_offset; | |
| 66 | caddr_t f_data; /* vnode or socket */ | |
| 67 | }; | |
| 68 | ||
| 69 | extern struct file *filehead; /* head of list of open files */ | |
| 70 | extern int maxfiles; /* kernel limit on number of open files */ | |
| 71 | extern int nfiles; /* actual number of open files */ | |
| 72 | ||
| 73 | #endif /* KERNEL */ |