lib/libc/gen/sysctlbyname.c

   1 /*      $NetBSD: sysctlbyname.c,v 1.7 2010/12/13 23:10:13 pooka Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2003,2004 The NetBSD Foundation, Inc.
   5  *      All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Andrew Brown.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 __RCSID("$NetBSD: sysctlbyname.c,v 1.7 2010/12/13 23:10:13 pooka Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #ifndef RUMP_ACTION
  38 #include "namespace.h"
  39 #endif
  40 #include <sys/param.h>
  41 #include <sys/sysctl.h>
  42
  43 #ifdef RUMP_ACTION
  44 #include <rump/rump_syscalls.h>
  45 #define sysctl(a,b,c,d,e,f) rump_sys___sysctl(a,b,c,d,e,f)
  46 #else
  47 #ifdef __weak_alias
  48 __weak_alias(sysctlbyname,_sysctlbyname)
  49 #endif
  50 #endif
  51
  52 /*
  53  * trivial sysctlbyname() function for the "lazy".
  54  */
  55 int
  56 sysctlbyname(const char *gname, void *oldp, size_t *oldlenp,
  57              const void *newp, size_t newlen)
  58 {
  59         int name[CTL_MAXNAME], rc;
  60         u_int namelen;
  61
  62         rc = sysctlgetmibinfo(gname, &name[0], &namelen, NULL, NULL, NULL,
  63                               SYSCTL_VERSION);
  64         if (rc == 0)
  65                 rc = sysctl(&name[0], namelen, oldp, oldlenp, newp, newlen);
  66         return (rc);
  67 }