1/*
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 *
9 */
10
11#include <sys/cdefs.h>
12__FBSDID("$FreeBSD: src/lib/libc/gen/sysctlbyname.c,v 1.5 2002/02/01 00:57:29 obrien Exp $");
13
14#include <sys/types.h>
15#include <sys/sysctl.h>
16#include <string.h>
17#include <sys/errno.h>
18#include <TargetConditionals.h>
19
20extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
21					void *newp, size_t newlen);
22extern int
23__sysctlbyname(const char *name, size_t namelen, void *oldp, size_t *oldlenp, void *newp,
24			   size_t newlen);
25
26int
27sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp,
28	     size_t newlen)
29{
30	int name2oid_oid[2];
31	int real_oid[CTL_MAXNAME+2];
32	int error;
33	size_t oidlen;
34
35#if !TARGET_IPHONE_SIMULATOR
36	/* Try primary system call first, fall back if not supported */
37	error = __sysctlbyname(name, strlen(name), oldp, oldlenp, newp, newlen);
38	if ((error == 0) || (errno != ENOSYS))
39		return error;
40#endif /* !TARGET_IPHONE_SIMULATOR */
41
42	name2oid_oid[0] = 0;	/* This is magic & undocumented! */
43	name2oid_oid[1] = 3;
44
45	oidlen = sizeof(real_oid);
46	error = __sysctl(name2oid_oid, 2, real_oid, &oidlen, (void *)name,
47		       strlen(name));
48	if (error < 0)
49		return error;
50	oidlen /= sizeof (int);
51	error = __sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen);
52	return (error);
53}
54
55