1 /* $NetBSD: nullfs.c,v 1.12 2014/03/20 03:13:18 christos 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 "stand.h"
64
65 /*
66 * Null filesystem
67 */
68
69 __compactcall int
null_open(const char * path,struct open_file * f)70 null_open(const char *path, struct open_file *f)
71 {
72
73 return EIO;
74 }
75
76 #ifndef LIBSA_NO_FS_CLOSE
77 __compactcall int
null_close(struct open_file * f)78 null_close(struct open_file *f)
79 {
80
81 return 0;
82 }
83 #endif
84
85 __compactcall int
null_read(struct open_file * f,void * buf,size_t size,size_t * resid)86 null_read(struct open_file *f, void *buf, size_t size, size_t *resid)
87 {
88
89 return EIO;
90 }
91
92 #ifndef LIBSA_NO_FS_WRITE
93 __compactcall int
null_write(struct open_file * f,void * buf,size_t size,size_t * resid)94 null_write(struct open_file *f, void *buf, size_t size, size_t *resid)
95 {
96
97 return EIO;
98 }
99 #endif
100
101 #ifndef LIBSA_NO_FS_SEEK
102 __compactcall off_t
null_seek(struct open_file * f,off_t offset,int where)103 null_seek(struct open_file *f, off_t offset, int where)
104 {
105
106 return (off_t)-1;
107 }
108 #endif
109
110 __compactcall int
null_stat(struct open_file * f,struct stat * sb)111 null_stat(struct open_file *f, struct stat *sb)
112 {
113
114 return EIO;
115 }
116
117 #if defined(LIBSA_ENABLE_LS_OP)
118 #include "ls.h"
119 __compactcall void
null_ls(struct open_file * f,const char * pattern)120 null_ls(struct open_file *f, const char *pattern)
121 {
122 lsunsup("nullfs");
123 }
124 #endif
125