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 */ 74