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 * $FreeBSD: src/sys/sys/file.h,v 1.22.2.7 2002/11/21 23:39:24 sam Exp $ 35 * $DragonFly: src/sys/sys/file.h,v 1.4 2003/07/29 20:03:08 dillon Exp $ 36 */ 37 38 #ifndef _SYS_FILE_H_ 39 #define _SYS_FILE_H_ 40 41 #ifndef _KERNEL 42 #include <sys/fcntl.h> 43 #include <sys/unistd.h> 44 #endif 45 46 #ifdef _KERNEL 47 #include <sys/queue.h> 48 49 struct stat; 50 struct proc; 51 struct thread; 52 struct uio; 53 struct knote; 54 struct file; 55 struct ucred; 56 struct lwkt_port; 57 58 struct fileops { 59 struct lwkt_port *fo_port; 60 u_int fo_autoq; 61 62 int (*fold_read) (struct file *fp, struct uio *uio, 63 struct ucred *cred, int flags, 64 struct thread *td); 65 int (*fold_write) (struct file *fp, struct uio *uio, 66 struct ucred *cred, int flags, 67 struct thread *td); 68 int (*fold_ioctl) (struct file *fp, u_long com, 69 caddr_t data, struct thread *td); 70 int (*fold_poll) (struct file *fp, int events, 71 struct ucred *cred, struct thread *td); 72 int (*fold_kqfilter) (struct file *fp, 73 struct knote *kn); 74 int (*fold_stat) (struct file *fp, struct stat *sb, 75 struct thread *td); 76 int (*fold_close) (struct file *fp, struct thread *td); 77 }; 78 79 #define FOF_OFFSET 1 /* fo_read(), fo_write() flags */ 80 81 /* 82 * Kernel descriptor table. 83 * One entry for each open kernel vnode and socket. 84 */ 85 struct file { 86 LIST_ENTRY(file) f_list;/* list of active files */ 87 short f_FILLER3; /* (old f_flag) */ 88 #define DTYPE_VNODE 1 /* file */ 89 #define DTYPE_SOCKET 2 /* communications endpoint */ 90 #define DTYPE_PIPE 3 /* pipe */ 91 #define DTYPE_FIFO 4 /* fifo (named pipe) */ 92 #define DTYPE_KQUEUE 5 /* event queue */ 93 #define DTYPE_CRYPTO 6 /* crypto */ 94 short f_type; /* descriptor type */ 95 u_int f_flag; /* see fcntl.h */ 96 struct ucred *f_cred; /* credentials associated with descriptor */ 97 struct fileops *f_ops; 98 int f_seqcount; /* 99 * count of sequential accesses -- cleared 100 * by most seek operations. 101 */ 102 off_t f_nextoff; /* 103 * offset of next expected read or write 104 */ 105 off_t f_offset; 106 caddr_t f_data; /* vnode or socket */ 107 int f_count; /* reference count */ 108 int f_msgcount; /* reference count from message queue */ 109 }; 110 111 #ifdef MALLOC_DECLARE 112 MALLOC_DECLARE(M_FILE); 113 #endif 114 115 extern int fdrop (struct file *fp, struct thread *td); 116 117 LIST_HEAD(filelist, file); 118 extern struct filelist filehead; /* head of list of open files */ 119 extern struct fileops vnops; 120 extern struct fileops badfileops; 121 extern int maxfiles; /* kernel limit on number of open files */ 122 extern int maxfilesperproc; /* per process limit on number of open files */ 123 extern int nfiles; /* actual number of open files */ 124 125 #endif /* _KERNEL */ 126 127 #endif /* !SYS_FILE_H */ 128