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 1.8 2003/10/19 23:23:29 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 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 47 48 #include <sys/queue.h> 49 50 struct stat; 51 struct proc; 52 struct thread; 53 struct uio; 54 struct knote; 55 struct file; 56 struct ucred; 57 struct vnode; 58 struct lwkt_port; 59 60 struct fileops { 61 struct lwkt_port *fo_port; 62 u_int fo_autoq; 63 64 int (*fold_read) (struct file *fp, struct uio *uio, 65 struct ucred *cred, int flags, 66 struct thread *td); 67 int (*fold_write) (struct file *fp, struct uio *uio, 68 struct ucred *cred, int flags, 69 struct thread *td); 70 int (*fold_ioctl) (struct file *fp, u_long com, 71 caddr_t data, struct thread *td); 72 int (*fold_poll) (struct file *fp, int events, 73 struct ucred *cred, struct thread *td); 74 int (*fold_kqfilter) (struct file *fp, 75 struct knote *kn); 76 int (*fold_stat) (struct file *fp, struct stat *sb, 77 struct thread *td); 78 int (*fold_close) (struct file *fp, struct thread *td); 79 }; 80 81 #define FOF_OFFSET 1 /* fo_read(), fo_write() flags */ 82 83 /* 84 * Kernel descriptor table. 85 * One entry for each open kernel vnode and socket. 86 */ 87 struct file { 88 LIST_ENTRY(file) f_list;/* list of active files */ 89 short f_FILLER3; /* (old f_flag) */ 90 #define DTYPE_VNODE 1 /* file */ 91 #define DTYPE_SOCKET 2 /* communications endpoint */ 92 #define DTYPE_PIPE 3 /* pipe */ 93 #define DTYPE_FIFO 4 /* fifo (named pipe) */ 94 #define DTYPE_KQUEUE 5 /* event queue */ 95 #define DTYPE_CRYPTO 6 /* crypto */ 96 short f_type; /* descriptor type */ 97 u_int f_flag; /* see fcntl.h */ 98 struct ucred *f_cred; /* credentials associated with descriptor */ 99 struct fileops *f_ops; 100 int f_seqcount; /* 101 * count of sequential accesses -- cleared 102 * by most seek operations. 103 */ 104 off_t f_nextoff; /* 105 * offset of next expected read or write 106 */ 107 off_t f_offset; 108 caddr_t f_data; /* vnode or socket */ 109 int f_count; /* reference count */ 110 int f_msgcount; /* reference count from message queue */ 111 }; 112 113 LIST_HEAD(filelist, file); 114 115 #endif 116 117 #ifdef _KERNEL 118 119 #ifdef MALLOC_DECLARE 120 MALLOC_DECLARE(M_FILE); 121 #endif 122 123 extern int fdrop (struct file *fp, struct thread *td); 124 125 extern int fp_open(const char *path, int flags, int mode, struct file **fpp); 126 extern int fp_vpopen(struct vnode *vp, int flags, struct file **fpp); 127 extern int fp_pread(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res); 128 extern int fp_pwrite(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res); 129 extern int fp_read(struct file *fp, void *buf, size_t nbytes, ssize_t *res); 130 extern int fp_write(struct file *fp, void *buf, size_t nbytes, ssize_t *res); 131 extern int fp_stat(struct file *fp, struct stat *ub); 132 extern int fp_mmap(void *addr, size_t size, int prot, int flags, struct file *fp, off_t pos, void **resp); 133 134 extern int fp_close(struct file *fp); 135 136 extern struct filelist filehead; /* head of list of open files */ 137 extern struct fileops vnops; 138 extern struct fileops badfileops; 139 extern int maxfiles; /* kernel limit on number of open files */ 140 extern int maxfilesperproc; /* per process limit on number of open files */ 141 extern int nfiles; /* actual number of open files */ 142 143 #endif /* _KERNEL */ 144 145 #endif /* !SYS_FILE_H */ 146