1 /* $NetBSD: nullfs.c,v 1.1 1996/01/13 22:25:39 leo Exp $ */
2
3 /*
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * The Mach Operating System project at Carnegie-Mellon University.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)open.c 8.1 (Berkeley) 6/11/93
35 *
36 *
37 * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
38 * All Rights Reserved.
39 *
40 * Author: Alessandro Forin
41 *
42 * Permission to use, copy, modify and distribute this software and its
43 * documentation is hereby granted, provided that both the copyright
44 * notice and this permission notice appear in all copies of the
45 * software, derivative works or modified versions, and any portions
46 * thereof, and that both notices appear in supporting documentation.
47 *
48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
50 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
51 *
52 * Carnegie Mellon requests users of this software to return to
53 *
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
58 *
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
61 */
62
63 #include <sys/cdefs.h>
64
65 #include "stand.h"
66
67 /*
68 * Null filesystem
69 */
70 int
null_open(const char * path __unused,struct open_file * f __unused)71 null_open(const char *path __unused, struct open_file *f __unused)
72 {
73 return EINVAL;
74 }
75
76 int
null_close(struct open_file * f __unused)77 null_close(struct open_file *f __unused)
78 {
79 return 0;
80 }
81
82 int
null_read(struct open_file * f __unused,void * buf __unused,size_t size __unused,size_t * resid __unused)83 null_read(struct open_file *f __unused, void *buf __unused,
84 size_t size __unused, size_t *resid __unused)
85 {
86 return EIO;
87 }
88
89 int
null_write(struct open_file * f __unused,const void * buf __unused,size_t size __unused,size_t * resid __unused)90 null_write(struct open_file *f __unused, const void *buf __unused,
91 size_t size __unused, size_t *resid __unused)
92 {
93 return EROFS;
94 }
95
96 off_t
null_seek(struct open_file * f __unused,off_t offset __unused,int where __unused)97 null_seek(struct open_file *f __unused, off_t offset __unused,
98 int where __unused)
99 {
100 errno = EIO;
101 return -1;
102 }
103
104 int
null_stat(struct open_file * f __unused,struct stat * sb __unused)105 null_stat(struct open_file *f __unused, struct stat *sb __unused)
106 {
107 return EIO;
108 }
109
110 int
null_readdir(struct open_file * f __unused,struct dirent * d __unused)111 null_readdir(struct open_file *f __unused, struct dirent *d __unused)
112 {
113 return EIO;
114 }
115