sysctl.c revision 204170
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 * 4. 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
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)sysctl.c	8.2 (Berkeley) 1/4/94";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/lib/libc/gen/sysctl.c 204170 2010-02-21 13:57:02Z ed $");
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
46extern int __sysctl(const int *name, u_int namelen, void *oldp,
47    size_t *oldlenp, const void *newp, size_t newlen);
48
49int
50sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
51    const void *newp, size_t newlen)
52{
53	if (name[0] != CTL_USER)
54		return (__sysctl(name, namelen, oldp, oldlenp, newp, newlen));
55
56	if (newp != NULL) {
57		errno = EPERM;
58		return (-1);
59	}
60	if (namelen != 2) {
61		errno = EINVAL;
62		return (-1);
63	}
64
65	switch (name[1]) {
66	case USER_CS_PATH:
67		if (oldp && *oldlenp < sizeof(_PATH_STDPATH)) {
68			errno = ENOMEM;
69			return -1;
70		}
71		*oldlenp = sizeof(_PATH_STDPATH);
72		if (oldp != NULL)
73			memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH));
74		return (0);
75	}
76
77	if (oldp && *oldlenp < sizeof(int)) {
78		errno = ENOMEM;
79		return (-1);
80	}
81	*oldlenp = sizeof(int);
82	if (oldp == NULL)
83		return (0);
84
85	switch (name[1]) {
86	case USER_BC_BASE_MAX:
87		*(int *)oldp = BC_BASE_MAX;
88		return (0);
89	case USER_BC_DIM_MAX:
90		*(int *)oldp = BC_DIM_MAX;
91		return (0);
92	case USER_BC_SCALE_MAX:
93		*(int *)oldp = BC_SCALE_MAX;
94		return (0);
95	case USER_BC_STRING_MAX:
96		*(int *)oldp = BC_STRING_MAX;
97		return (0);
98	case USER_COLL_WEIGHTS_MAX:
99		*(int *)oldp = COLL_WEIGHTS_MAX;
100		return (0);
101	case USER_EXPR_NEST_MAX:
102		*(int *)oldp = EXPR_NEST_MAX;
103		return (0);
104	case USER_LINE_MAX:
105		*(int *)oldp = LINE_MAX;
106		return (0);
107	case USER_RE_DUP_MAX:
108		*(int *)oldp = RE_DUP_MAX;
109		return (0);
110	case USER_POSIX2_VERSION:
111		*(int *)oldp = _POSIX2_VERSION;
112		return (0);
113	case USER_POSIX2_C_BIND:
114#ifdef POSIX2_C_BIND
115		*(int *)oldp = 1;
116#else
117		*(int *)oldp = 0;
118#endif
119		return (0);
120	case USER_POSIX2_C_DEV:
121#ifdef	POSIX2_C_DEV
122		*(int *)oldp = 1;
123#else
124		*(int *)oldp = 0;
125#endif
126		return (0);
127	case USER_POSIX2_CHAR_TERM:
128#ifdef	POSIX2_CHAR_TERM
129		*(int *)oldp = 1;
130#else
131		*(int *)oldp = 0;
132#endif
133		return (0);
134	case USER_POSIX2_FORT_DEV:
135#ifdef	POSIX2_FORT_DEV
136		*(int *)oldp = 1;
137#else
138		*(int *)oldp = 0;
139#endif
140		return (0);
141	case USER_POSIX2_FORT_RUN:
142#ifdef	POSIX2_FORT_RUN
143		*(int *)oldp = 1;
144#else
145		*(int *)oldp = 0;
146#endif
147		return (0);
148	case USER_POSIX2_LOCALEDEF:
149#ifdef	POSIX2_LOCALEDEF
150		*(int *)oldp = 1;
151#else
152		*(int *)oldp = 0;
153#endif
154		return (0);
155	case USER_POSIX2_SW_DEV:
156#ifdef	POSIX2_SW_DEV
157		*(int *)oldp = 1;
158#else
159		*(int *)oldp = 0;
160#endif
161		return (0);
162	case USER_POSIX2_UPE:
163#ifdef	POSIX2_UPE
164		*(int *)oldp = 1;
165#else
166		*(int *)oldp = 0;
167#endif
168		return (0);
169	case USER_STREAM_MAX:
170		*(int *)oldp = FOPEN_MAX;
171		return (0);
172	case USER_TZNAME_MAX:
173		*(int *)oldp = NAME_MAX;
174		return (0);
175	default:
176		errno = EINVAL;
177		return (-1);
178	}
179	/* NOTREACHED */
180}
181