1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __SCCSID("@(#)sysctl.c 8.2 (Berkeley) 1/4/94");
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37 #include <sys/sysctl.h>
38
39 #include <errno.h>
40 #include <limits.h>
41 #include <paths.h>
42 #include <stdio.h>
43 #include <unistd.h>
44 #include <string.h>
45
46 extern int __sysctl(const int *name, u_int namelen, void *oldp,
47 size_t *oldlenp, const void *newp, size_t newlen);
48
49 int
sysctl(const int * name,u_int namelen,void * oldp,size_t * oldlenp,const void * newp,size_t newlen)50 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
51 const void *newp, size_t newlen)
52 {
53 int retval;
54 size_t orig_oldlen;
55
56 orig_oldlen = oldlenp ? *oldlenp : 0;
57 retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen);
58 /*
59 * All valid names under CTL_USER have a dummy entry in the sysctl
60 * tree (to support name lookups and enumerations) with an
61 * empty/zero value, and the true value is supplied by this routine.
62 * For all such names, __sysctl() is used solely to validate the
63 * name.
64 *
65 * Return here unless there was a successful lookup for a CTL_USER
66 * name.
67 */
68 if (retval || name[0] != CTL_USER)
69 return (retval);
70
71 if (newp != NULL) {
72 errno = EPERM;
73 return (-1);
74 }
75 if (namelen != 2) {
76 errno = EINVAL;
77 return (-1);
78 }
79
80 switch (name[1]) {
81 case USER_CS_PATH:
82 if (oldp && orig_oldlen < sizeof(_PATH_STDPATH)) {
83 errno = ENOMEM;
84 return -1;
85 }
86 *oldlenp = sizeof(_PATH_STDPATH);
87 if (oldp != NULL)
88 memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH));
89 return (0);
90 }
91
92 if (oldp && *oldlenp < sizeof(int)) {
93 errno = ENOMEM;
94 return (-1);
95 }
96 *oldlenp = sizeof(int);
97 if (oldp == NULL)
98 return (0);
99
100 switch (name[1]) {
101 case USER_BC_BASE_MAX:
102 *(int *)oldp = BC_BASE_MAX;
103 return (0);
104 case USER_BC_DIM_MAX:
105 *(int *)oldp = BC_DIM_MAX;
106 return (0);
107 case USER_BC_SCALE_MAX:
108 *(int *)oldp = BC_SCALE_MAX;
109 return (0);
110 case USER_BC_STRING_MAX:
111 *(int *)oldp = BC_STRING_MAX;
112 return (0);
113 case USER_COLL_WEIGHTS_MAX:
114 *(int *)oldp = COLL_WEIGHTS_MAX;
115 return (0);
116 case USER_EXPR_NEST_MAX:
117 *(int *)oldp = EXPR_NEST_MAX;
118 return (0);
119 case USER_LINE_MAX:
120 *(int *)oldp = LINE_MAX;
121 return (0);
122 case USER_RE_DUP_MAX:
123 *(int *)oldp = RE_DUP_MAX;
124 return (0);
125 case USER_POSIX2_VERSION:
126 *(int *)oldp = _POSIX2_VERSION;
127 return (0);
128 case USER_POSIX2_C_BIND:
129 #ifdef POSIX2_C_BIND
130 *(int *)oldp = 1;
131 #else
132 *(int *)oldp = 0;
133 #endif
134 return (0);
135 case USER_POSIX2_C_DEV:
136 #ifdef POSIX2_C_DEV
137 *(int *)oldp = 1;
138 #else
139 *(int *)oldp = 0;
140 #endif
141 return (0);
142 case USER_POSIX2_CHAR_TERM:
143 #ifdef POSIX2_CHAR_TERM
144 *(int *)oldp = 1;
145 #else
146 *(int *)oldp = 0;
147 #endif
148 return (0);
149 case USER_POSIX2_FORT_DEV:
150 #ifdef POSIX2_FORT_DEV
151 *(int *)oldp = 1;
152 #else
153 *(int *)oldp = 0;
154 #endif
155 return (0);
156 case USER_POSIX2_FORT_RUN:
157 #ifdef POSIX2_FORT_RUN
158 *(int *)oldp = 1;
159 #else
160 *(int *)oldp = 0;
161 #endif
162 return (0);
163 case USER_POSIX2_LOCALEDEF:
164 #ifdef POSIX2_LOCALEDEF
165 *(int *)oldp = 1;
166 #else
167 *(int *)oldp = 0;
168 #endif
169 return (0);
170 case USER_POSIX2_SW_DEV:
171 #ifdef POSIX2_SW_DEV
172 *(int *)oldp = 1;
173 #else
174 *(int *)oldp = 0;
175 #endif
176 return (0);
177 case USER_POSIX2_UPE:
178 #ifdef POSIX2_UPE
179 *(int *)oldp = 1;
180 #else
181 *(int *)oldp = 0;
182 #endif
183 return (0);
184 case USER_STREAM_MAX:
185 *(int *)oldp = FOPEN_MAX;
186 return (0);
187 case USER_TZNAME_MAX:
188 *(int *)oldp = NAME_MAX;
189 return (0);
190 default:
191 errno = EINVAL;
192 return (-1);
193 }
194 /* NOTREACHED */
195 }
196