2 * SPDX-License-Identifier: BSD-3-Clause
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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32 #include <sys/cdefs.h>
33 __SCCSID("@(#)sysctl.c 8.2 (Berkeley) 1/4/94");
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/sysctl.h>
46 extern int __sysctl(const int *name, u_int namelen, void *oldp,
47 size_t *oldlenp, const void *newp, size_t newlen);
50 set_user_str(void *dstp, size_t *dstlenp, const char *src, size_t len,
62 memcpy(dstp, src, len);
69 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
70 const void *newp, size_t newlen)
75 orig_oldlen = oldlenp != NULL ? *oldlenp : 0;
76 retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen);
78 * Valid names under CTL_USER except USER_LOCALBASE have a dummy entry
79 * in the sysctl tree (to support name lookups and enumerations) with
80 * an empty/zero value, and the true value is supplied by this routine.
81 * For all such names, __sysctl() is used solely to validate the name.
83 * Return here unless there was a successful lookup for a CTL_USER name.
85 if (retval != 0 || name[0] != CTL_USER)
93 /* Variables under CLT_USER that may be overridden by kernel values */
96 if (oldlenp == NULL || *oldlenp > sizeof(""))
98 return (set_user_str(oldp, oldlenp, _PATH_LOCALBASE,
99 sizeof(_PATH_LOCALBASE), orig_oldlen));
102 /* Variables under CLT_USER whose values are immutably defined below */
110 return (set_user_str(oldp, oldlenp, _PATH_STDPATH,
111 sizeof(_PATH_STDPATH), orig_oldlen));
114 if (oldp != NULL && *oldlenp < sizeof(int)) {
118 *oldlenp = sizeof(int);
123 case USER_BC_BASE_MAX:
124 *(int *)oldp = BC_BASE_MAX;
126 case USER_BC_DIM_MAX:
127 *(int *)oldp = BC_DIM_MAX;
129 case USER_BC_SCALE_MAX:
130 *(int *)oldp = BC_SCALE_MAX;
132 case USER_BC_STRING_MAX:
133 *(int *)oldp = BC_STRING_MAX;
135 case USER_COLL_WEIGHTS_MAX:
136 *(int *)oldp = COLL_WEIGHTS_MAX;
138 case USER_EXPR_NEST_MAX:
139 *(int *)oldp = EXPR_NEST_MAX;
142 *(int *)oldp = LINE_MAX;
144 case USER_RE_DUP_MAX:
145 *(int *)oldp = RE_DUP_MAX;
147 case USER_POSIX2_VERSION:
148 *(int *)oldp = _POSIX2_VERSION;
150 case USER_POSIX2_C_BIND:
157 case USER_POSIX2_C_DEV:
164 case USER_POSIX2_CHAR_TERM:
165 #ifdef POSIX2_CHAR_TERM
171 case USER_POSIX2_FORT_DEV:
172 #ifdef POSIX2_FORT_DEV
178 case USER_POSIX2_FORT_RUN:
179 #ifdef POSIX2_FORT_RUN
185 case USER_POSIX2_LOCALEDEF:
186 #ifdef POSIX2_LOCALEDEF
192 case USER_POSIX2_SW_DEV:
199 case USER_POSIX2_UPE:
206 case USER_STREAM_MAX:
207 *(int *)oldp = FOPEN_MAX;
209 case USER_TZNAME_MAX:
210 *(int *)oldp = NAME_MAX;