lib/libc/gen/sysctlbyname.c

   1 /*      $NetBSD: sysctlbyname.c,v 1.4 2008/04/29 06:53:01 martin 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 1.4 2008/04/29 06:53:01 martin Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #include "namespace.h"
  38 #include <sys/param.h>
  39 #include <sys/sysctl.h>
  40
  41 #ifdef __weak_alias
  42 __weak_alias(sysctlbyname,_sysctlbyname)
  43 #endif
  44
  45 /*
  46  * trivial sysctlbyname() function for the "lazy".
  47  */
  48 int
  49 sysctlbyname(const char *gname, void *oldp, size_t *oldlenp,
  50              const void *newp, size_t newlen)
  51 {
  52         int name[CTL_MAXNAME], rc;
  53         u_int namelen;
  54
  55         rc = sysctlgetmibinfo(gname, &name[0], &namelen, NULL, NULL, NULL,
  56                               SYSCTL_VERSION);
  57         if (rc == 0)
  58                 rc = sysctl(&name[0], namelen, oldp, oldlenp, newp, newlen);
  59         return (rc);
  60 }