diff options
Diffstat (limited to 'lib/libc/gen/sysctl.c')
| -rw-r--r-- | lib/libc/gen/sysctl.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/lib/libc/gen/sysctl.c b/lib/libc/gen/sysctl.c new file mode 100644 index 000000000000..d6fadd3c3e5c --- /dev/null +++ b/lib/libc/gen/sysctl.c @@ -0,0 +1,213 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/sysctl.h> + +#include <errno.h> +#include <limits.h> +#include <paths.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> + +extern int __sysctl(const int *name, u_int namelen, void *oldp, + size_t *oldlenp, const void *newp, size_t newlen); + +static int +set_user_str(void *dstp, size_t *dstlenp, const char *src, size_t len, + size_t maxlen) +{ + int retval; + + retval = 0; + if (dstp != NULL) { + if (len > maxlen) { + len = maxlen; + errno = ENOMEM; + retval = -1; + } + memcpy(dstp, src, len); + } + *dstlenp = len; + return (retval); +} + +int +sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, + const void *newp, size_t newlen) +{ + int retval; + size_t orig_oldlen; + + orig_oldlen = oldlenp != NULL ? *oldlenp : 0; + retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen); + /* + * Valid names under CTL_USER except USER_LOCALBASE have a dummy entry + * in the sysctl tree (to support name lookups and enumerations) with + * an empty/zero value, and the true value is supplied by this routine. + * For all such names, __sysctl() is used solely to validate the name. + * + * Return here unless there was a successful lookup for a CTL_USER name. + */ + if (retval != 0 || name[0] != CTL_USER) + return (retval); + + if (namelen != 2) { + errno = EINVAL; + return (-1); + } + + /* Variables under CLT_USER that may be overridden by kernel values */ + switch (name[1]) { + case USER_LOCALBASE: + if (oldlenp == NULL || *oldlenp > sizeof("")) + return (0); + return (set_user_str(oldp, oldlenp, _PATH_LOCALBASE, + sizeof(_PATH_LOCALBASE), orig_oldlen)); + } + + /* Variables under CLT_USER whose values are immutably defined below */ + if (newp != NULL) { + errno = EPERM; + return (-1); + } + + switch (name[1]) { + case USER_CS_PATH: + return (set_user_str(oldp, oldlenp, _PATH_STDPATH, + sizeof(_PATH_STDPATH), orig_oldlen)); + } + + if (oldp != NULL && *oldlenp < sizeof(int)) { + errno = ENOMEM; + return (-1); + } + *oldlenp = sizeof(int); + if (oldp == NULL) + return (0); + + switch (name[1]) { + case USER_BC_BASE_MAX: + *(int *)oldp = BC_BASE_MAX; + return (0); + case USER_BC_DIM_MAX: + *(int *)oldp = BC_DIM_MAX; + return (0); + case USER_BC_SCALE_MAX: + *(int *)oldp = BC_SCALE_MAX; + return (0); + case USER_BC_STRING_MAX: + *(int *)oldp = BC_STRING_MAX; + return (0); + case USER_COLL_WEIGHTS_MAX: + *(int *)oldp = COLL_WEIGHTS_MAX; + return (0); + case USER_EXPR_NEST_MAX: + *(int *)oldp = EXPR_NEST_MAX; + return (0); + case USER_LINE_MAX: + *(int *)oldp = LINE_MAX; + return (0); + case USER_RE_DUP_MAX: + *(int *)oldp = RE_DUP_MAX; + return (0); + case USER_POSIX2_VERSION: + *(int *)oldp = _POSIX2_VERSION; + return (0); + case USER_POSIX2_C_BIND: +#ifdef POSIX2_C_BIND + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_POSIX2_C_DEV: +#ifdef POSIX2_C_DEV + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_POSIX2_CHAR_TERM: +#ifdef POSIX2_CHAR_TERM + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_POSIX2_FORT_DEV: +#ifdef POSIX2_FORT_DEV + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_POSIX2_FORT_RUN: +#ifdef POSIX2_FORT_RUN + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_POSIX2_LOCALEDEF: +#ifdef POSIX2_LOCALEDEF + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_POSIX2_SW_DEV: +#ifdef POSIX2_SW_DEV + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_POSIX2_UPE: +#ifdef POSIX2_UPE + *(int *)oldp = 1; +#else + *(int *)oldp = 0; +#endif + return (0); + case USER_STREAM_MAX: + *(int *)oldp = FOPEN_MAX; + return (0); + case USER_TZNAME_MAX: + *(int *)oldp = NAME_MAX; + return (0); + default: + errno = EINVAL; + return (-1); + } + /* NOTREACHED */ +} |