lib/libc/gen/sysctlnametomib.c

   1 /*      $NetBSD: sysctlnametomib.c,v 1.7 2012/03/13 21:13:37 christos 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: sysctlnametomib.c,v 1.7 2012/03/13 21:13:37 christos 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 #include <assert.h>
  43
  44 #ifdef RUMP_ACTION
  45 #include <rump/rump_syscalls.h>
  46 #define sysctl(a,b,c,d,e,f) rump_sys___sysctl(a,b,c,d,e,f)
  47 #else
  48 #ifdef __weak_alias
  49 __weak_alias(sysctlnametomib,_sysctlnametomib)
  50 #endif
  51 #endif /* RUMP_ACTION */
  52
  53 /*
  54  * freebsd compatible sysctlnametomib() function, implemented as an
  55  * extremely thin wrapper around sysctlgetmibinfo().  i think the use
  56  * of size_t as the third argument is erroneous, but what can we do
  57  * about that?
  58  */
  59 int
  60 sysctlnametomib(const char *gname, int *iname, size_t *namelenp)
  61 {
  62         u_int unamelen;
  63         int rc;
  64
  65         _DIAGASSERT(__type_fit(u_int, *namelenp));
  66         unamelen = (u_int)*namelenp;
  67         rc = sysctlgetmibinfo(gname, iname, &unamelen, NULL, NULL, NULL,
  68                               SYSCTL_VERSION);
  69         *namelenp = unamelen;
  70
  71         return (rc);
  72 }