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
77 static TUNABLE(bool, no_sigsys, "-no_sigsys", false);
78 #define send_sigsys (!no_sigsys)
79 #else
80 #define send_sigsys true
81 #endif
82
83 /*
84 * Unsupported device function (e.g. writing to read-only device).
85 */
86 int
enodev(void)87 enodev(void)
88 {
89 return ENODEV;
90 }
91
92 /*
93 * Unsupported strategy function.
94 */
95 void
enodev_strat(void)96 enodev_strat(void)
97 {
98 return;
99 }
100
101 /*
102 * Unconfigured device function; driver not configured.
103 */
104 int
enxio(void)105 enxio(void)
106 {
107 return ENXIO;
108 }
109
110 /*
111 * Unsupported ioctl function.
112 */
113 int
enoioctl(void)114 enoioctl(void)
115 {
116 return ENOTTY;
117 }
118
119
120 /*
121 * Unsupported system function.
122 * This is used for an otherwise-reasonable operation
123 * that is not supported by the current system binary.
124 */
125 int
enosys(void)126 enosys(void)
127 {
128 return ENOSYS;
129 }
130
131 /*
132 * Return error for operation not supported
133 * on a specific object or file type.
134 *
135 * XXX Name of this routine is wrong.
136 */
137 int
eopnotsupp(void)138 eopnotsupp(void)
139 {
140 return ENOTSUP;
141 }
142
143 /*
144 * Generic null operation, always returns success.
145 */
146 int
nullop(void)147 nullop(void)
148 {
149 return 0;
150 }
151
152
153 /*
154 * Null routine; placed in insignificant entries
155 * in the bdevsw and cdevsw tables.
156 */
157 int
nulldev(void)158 nulldev(void)
159 {
160 return 0;
161 }
162
163 /*
164 * Null system calls. Not invalid, just not configured.
165 */
166 int
errsys(void)167 errsys(void)
168 {
169 return EINVAL;
170 }
171
172 void
nullsys(void)173 nullsys(void)
174 {
175 }
176
177 /*
178 * nonexistent system call-- signal process (may want to handle it)
179 * flag error if process won't see signal immediately
180 * Q: should we do that all the time ??
181 */
182 /* ARGSUSED */
183 int
nosys(__unused struct proc * p,__unused struct nosys_args * args,__unused int32_t * retval)184 nosys(__unused struct proc *p, __unused struct nosys_args *args, __unused int32_t *retval)
185 {
186 if (send_sigsys) {
187 psignal_uthread(current_thread(), SIGSYS);
188 }
189 return ENOSYS;
190 }
191