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      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 }
     68