2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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 1.18 2006/05/20 02:42:13 dillon Exp $
42 #include <sys/types.h>
45 #include <sys/fcntl.h>
47 #ifndef _SYS_UNISTD_H_
48 #include <sys/unistd.h>
51 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
54 #include <sys/queue.h>
69 struct lwkt_port *fo_port;
70 int (*fo_clone) (struct file *);/* additional work after dup */
72 int (*fold_read) (struct file *fp, struct uio *uio,
73 struct ucred *cred, int flags);
74 int (*fold_write) (struct file *fp, struct uio *uio,
75 struct ucred *cred, int flags);
76 int (*fold_ioctl) (struct file *fp, u_long com, caddr_t data,
78 int (*fold_poll) (struct file *fp, int events,
80 int (*fold_kqfilter) (struct file *fp, struct knote *kn);
81 int (*fold_stat) (struct file *fp, struct stat *sb,
83 int (*fold_close) (struct file *fp);
84 int (*fold_shutdown) (struct file *fp, int how);
87 #define FOF_OFFSET 1 /* fo_read(), fo_write() flags */
90 * Kernel descriptor table.
91 * One entry for each open kernel vnode and socket.
94 LIST_ENTRY(file) f_list;/* list of active files */
95 short f_FILLER3; /* (old f_flag) */
96 #define DTYPE_VNODE 1 /* file */
97 #define DTYPE_SOCKET 2 /* communications endpoint */
98 #define DTYPE_PIPE 3 /* pipe */
99 #define DTYPE_FIFO 4 /* fifo (named pipe) */
100 #define DTYPE_KQUEUE 5 /* event queue */
101 #define DTYPE_CRYPTO 6 /* crypto */
102 short f_type; /* descriptor type */
103 u_int f_flag; /* see fcntl.h */
104 struct ucred *f_cred; /* credentials associated with descriptor */
105 struct fileops *f_ops;
107 * count of sequential accesses -- cleared
108 * by most seek operations.
111 * offset of next expected read or write
114 void *f_data; /* vnode, pipe, socket, or kqueue */
115 int f_count; /* reference count */
116 int f_msgcount; /* reference count from message queue */
117 struct namecache *f_ncp; /* ncp (required for directories) */
120 LIST_HEAD(filelist, file);
126 #ifdef MALLOC_DECLARE
127 MALLOC_DECLARE(M_FILE);
130 extern int fdrop (struct file *fp);
131 extern int fp_open(const char *path, int flags, int mode, struct file **fpp);
132 extern int fp_vpopen(struct vnode *vp, int flags, struct file **fpp);
133 extern int fp_pread(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res);
134 extern int fp_pwrite(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res);
135 extern int fp_read(struct file *fp, void *buf, size_t nbytes, ssize_t *res, int all);
136 extern int fp_write(struct file *fp, void *buf, size_t nbytes, ssize_t *res);
137 extern int fp_stat(struct file *fp, struct stat *ub);
138 extern int fp_mmap(void *addr, size_t size, int prot, int flags, struct file *fp, off_t pos, void **resp);
140 extern int nofo_shutdown(struct file *fp, int how);
142 extern int fp_close(struct file *fp);
143 extern int fp_shutdown(struct file *fp, int how);
145 extern struct filelist filehead; /* head of list of open files */
146 extern struct fileops vnode_fileops;
147 extern struct fileops specvnode_fileops;
148 extern struct fileops badfileops;
149 extern int maxfiles; /* kernel limit on number of open files */
150 extern int maxfilesrootres; /* descriptors reserved for root use */
151 extern int maxfilesperproc; /* per process limit on number of open files */
152 extern int nfiles; /* actual number of open files */
156 #endif /* !SYS_FILE_H */