1 /* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. 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 8.3 (Berkeley) 1/9/95 34 * $Id: file.h,v 1.1.1.1 2006/05/30 06:12:53 hhzhou Exp $ 35 */ 36 37 #ifndef _SYS_FILE_H_ 38 #define _SYS_FILE_H_ 39 40 #ifndef KERNEL 41 #include <sys/fcntl.h> 42 #include <sys/unistd.h> 43 #endif 44 45 #ifdef KERNEL 46 #include <sys/queue.h> 47 48 struct proc; 49 struct uio; 50 51 /* 52 * Kernel descriptor table. 53 * One entry for each open kernel vnode and socket. 54 */ 55 struct file { 56 LIST_ENTRY(file) f_list;/* list of active files */ 57 short f_flag; /* see fcntl.h */ 58 #define DTYPE_VNODE 1 /* file */ 59 #define DTYPE_SOCKET 2 /* communications endpoint */ 60 #define DTYPE_PIPE 3 /* pipe */ 61 #define DTYPE_FIFO 4 /* fifo (named pipe) */ 62 short f_type; /* descriptor type */ 63 short f_count; /* reference count */ 64 short f_msgcount; /* references from message queue */ 65 struct ucred *f_cred; /* credentials associated with descriptor */ 66 struct fileops { 67 int (*fo_read) __P((struct file *fp, struct uio *uio, 68 struct ucred *cred, int flags)); 69 int (*fo_write) __P((struct file *fp, struct uio *uio, 70 struct ucred *cred, int flags)); 71 #define FOF_OFFSET 1 72 int (*fo_ioctl) __P((struct file *fp, u_long com, 73 caddr_t data, struct proc *p)); 74 int (*fo_poll) __P((struct file *fp, int events, 75 struct ucred *cred, struct proc *p)); 76 int (*fo_close) __P((struct file *fp, struct proc *p)); 77 } *f_ops; 78 int f_seqcount; /* 79 * count of sequential accesses -- cleared 80 * by most seek operations. 81 */ 82 off_t f_nextread; /* 83 * offset of next expected read 84 */ 85 off_t f_offset; 86 caddr_t f_data; /* vnode or socket */ 87 }; 88 89 #ifdef MALLOC_DECLARE 90 MALLOC_DECLARE(M_FILE); 91 #endif 92 93 LIST_HEAD(filelist, file); 94 extern struct filelist filehead; /* head of list of open files */ 95 extern struct fileops vnops; 96 extern int maxfiles; /* kernel limit on number of open files */ 97 extern int maxfilesperproc; /* per process limit on number of open files */ 98 extern int nfiles; /* actual number of open files */ 99 100 #endif /* KERNEL */ 101 102 #endif /* !SYS_FILE_H */ 103
