Function sysctlbyname

tools/compat/sysctlbyname.c:19–30

#include <sys/sysctl.h>

int
sysctlbyname(const char *name, void *oldp, size_t *oldlenp,
    const void *newp, size_t newlen)
{
	int real_oid[CTL_MAXNAME+2];
	size_t oidlen;

	oidlen = sizeof(real_oid) / sizeof(int);
	if (sysctlnametomib(name, real_oid, &oidlen) < 0)
		return (-1);
	return (sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen));
}