1/*
2 * Copyright (c) 2018 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
29/*
30 * Copyright (c) 1982, 1986, 1991, 1993
31 * The Regents of the University of California. All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 3. All advertising materials mentioning features or use of this software
42 * must display the following acknowledgement:
43 * This product includes software developed by the University of
44 * California, Berkeley and its contributors.
45 * 4. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)subr_xxx.c 8.1 (Berkeley) 6/10/93
62 */
63
64#include <sys/param.h>
65#include <sys/systm.h>
66#include <sys/kernel.h>
67#include <sys/conf.h>
68#include <sys/proc_internal.h>
69#include <sys/vnode.h>
70#include <sys/uio.h>
71#include <sys/sysproto.h>
72
73#include <sys/signalvar.h> /* for psignal() */
74#include <kern/debug.h>
75
76#if DEVELOPMENT || DEBUG
77TUNABLE(bool, no_sigsys, "-no_sigsys", false);
78#endif
79
80/*
81 * Unsupported device function (e.g. writing to read-only device).
82 */
83int
84enodev(void)
85{
86 return ENODEV;
87}
88
89/*
90 * Unsupported strategy function.
91 */
92void
93enodev_strat(void)
94{
95 return;
96}
97
98/*
99 * Unconfigured device function; driver not configured.
100 */
101int
102enxio(void)
103{
104 return ENXIO;
105}
106
107/*
108 * Unsupported ioctl function.
109 */
110int
111enoioctl(void)
112{
113 return ENOTTY;
114}
115
116
117/*
118 * Unsupported system function.
119 * This is used for an otherwise-reasonable operation
120 * that is not supported by the current system binary.
121 */
122int
123enosys(void)
124{
125 return ENOSYS;
126}
127
128/*
129 * Return error for operation not supported
130 * on a specific object or file type.
131 *
132 * XXX Name of this routine is wrong.
133 */
134int
135eopnotsupp(void)
136{
137 return ENOTSUP;
138}
139
140/*
141 * Generic null operation, always returns success.
142 */
143int
144nullop(void)
145{
146 return 0;
147}
148
149
150/*
151 * Null routine; placed in insignificant entries
152 * in the bdevsw and cdevsw tables.
153 */
154int
155nulldev(void)
156{
157 return 0;
158}
159
160/*
161 * Null system calls. Not invalid, just not configured.
162 */
163int
164errsys(void)
165{
166 return EINVAL;
167}
168
169void
170nullsys(void)
171{
172}
173
174/*
175 * nonexistent system call-- signal process (may want to handle it)
176 * flag error if process won't see signal immediately
177 * Q: should we do that all the time ??
178 */
179/* ARGSUSED */
180int
181nosys(__unused struct proc *p, __unused struct nosys_args *args, __unused int32_t *retval)
182{
183 if (send_sigsys) {
184 psignal_uthread(current_thread(), SIGSYS);
185 }
186 return ENOSYS;
187}
188