1 /*-
2 * Copyright (c) 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)sysctl.c 8.2 (Berkeley) 1/4/94
30 * $FreeBSD: head/lib/libc/gen/sysctl.c 240176 2012-09-06 20:15:44Z trhodes $
31 */
32
33 #include <sys/param.h>
34 #include <sys/sysctl.h>
35
36 #include <errno.h>
37 #include <limits.h>
38 #include <paths.h>
39 #include <stdio.h>
40 #include <unistd.h>
41 #include <string.h>
42
43 extern int __sysctl(const int *name, u_int namelen, void *oldp,
44 size_t *oldlenp, const void *newp, size_t newlen);
45
46 int
sysctl(const int * name,u_int namelen,void * oldp,size_t * oldlenp,const void * newp,size_t newlen)47 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
48 const void *newp, size_t newlen)
49 {
50 int retval;
51 size_t orig_oldlen;
52
53 orig_oldlen = oldlenp ? *oldlenp : 0;
54 retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen);
55 /*
56 * All valid names under CTL_USER have a dummy entry in the sysctl
57 * tree (to support name lookups and enumerations) with an
58 * empty/zero value, and the true value is supplied by this routine.
59 * For all such names, __sysctl() is used solely to validate the
60 * name.
61 *
62 * Return here unless there was a successful lookup for a CTL_USER
63 * name.
64 */
65 if (retval || name[0] != CTL_USER)
66 return (retval);
67
68 if (newp != NULL) {
69 errno = EPERM;
70 return (-1);
71 }
72 if (namelen != 2) {
73 errno = EINVAL;
74 return (-1);
75 }
76
77 switch (name[1]) {
78 case USER_CS_PATH:
79 if (oldp && orig_oldlen < sizeof(_PATH_STDPATH)) {
80 errno = ENOMEM;
81 return -1;
82 }
83 *oldlenp = sizeof(_PATH_STDPATH);
84 if (oldp != NULL)
85 memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH));
86 return (0);
87 }
88
89 if (oldp && *oldlenp < sizeof(int)) {
90 errno = ENOMEM;
91 return (-1);
92 }
93 *oldlenp = sizeof(int);
94 if (oldp == NULL)
95 return (0);
96
97 switch (name[1]) {
98 case USER_BC_BASE_MAX:
99 *(int *)oldp = BC_BASE_MAX;
100 return (0);
101 case USER_BC_DIM_MAX:
102 *(int *)oldp = BC_DIM_MAX;
103 return (0);
104 case USER_BC_SCALE_MAX:
105 *(int *)oldp = BC_SCALE_MAX;
106 return (0);
107 case USER_BC_STRING_MAX:
108 *(int *)oldp = BC_STRING_MAX;
109 return (0);
110 case USER_COLL_WEIGHTS_MAX:
111 *(int *)oldp = COLL_WEIGHTS_MAX;
112 return (0);
113 case USER_EXPR_NEST_MAX:
114 *(int *)oldp = EXPR_NEST_MAX;
115 return (0);
116 case USER_LINE_MAX:
117 *(int *)oldp = LINE_MAX;
118 return (0);
119 case USER_RE_DUP_MAX:
120 *(int *)oldp = RE_DUP_MAX;
121 return (0);
122 case USER_POSIX2_VERSION:
123 *(int *)oldp = _POSIX2_VERSION;
124 return (0);
125 case USER_POSIX2_C_BIND:
126 #if _POSIX2_C_BIND > 0
127 *(int *)oldp = 1;
128 #else
129 *(int *)oldp = 0;
130 #endif
131 return (0);
132 case USER_POSIX2_C_DEV:
133 #if _POSIX2_C_DEV > 0
134 *(int *)oldp = 1;
135 #else
136 *(int *)oldp = 0;
137 #endif
138 return (0);
139 case USER_POSIX2_CHAR_TERM:
140 #if _POSIX2_CHAR_TERM > 0
141 *(int *)oldp = 1;
142 #else
143 *(int *)oldp = 0;
144 #endif
145 return (0);
146 case USER_POSIX2_FORT_DEV:
147 #if _POSIX2_FORT_DEV > 0
148 *(int *)oldp = 1;
149 #else
150 *(int *)oldp = 0;
151 #endif
152 return (0);
153 case USER_POSIX2_FORT_RUN:
154 #if _POSIX2_FORT_RUN > 0
155 *(int *)oldp = 1;
156 #else
157 *(int *)oldp = 0;
158 #endif
159 return (0);
160 case USER_POSIX2_LOCALEDEF:
161 #if _POSIX2_LOCALEDEF > 0
162 *(int *)oldp = 1;
163 #else
164 *(int *)oldp = 0;
165 #endif
166 return (0);
167 case USER_POSIX2_SW_DEV:
168 #if _POSIX2_SW_DEV > 0
169 *(int *)oldp = 1;
170 #else
171 *(int *)oldp = 0;
172 #endif
173 return (0);
174 case USER_POSIX2_UPE:
175 #if _POSIX2_UPE > 0
176 *(int *)oldp = 1;
177 #else
178 *(int *)oldp = 0;
179 #endif
180 return (0);
181 case USER_STREAM_MAX:
182 *(int *)oldp = FOPEN_MAX;
183 return (0);
184 case USER_TZNAME_MAX:
185 *(int *)oldp = NAME_MAX;
186 return (0);
187 default:
188 errno = EINVAL;
189 return (-1);
190 }
191 /* NOTREACHED */
192 }
193