xref: /illumos-gate/usr/src/boot/libsa/nullfs.c (revision 55fea89d)
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