prog_sysctlnametomib
if (prog_sysctlnametomib("net.bpf.peers", &name[0], &sz) == -1)
if (prog_sysctlnametomib(mibname, mib, &namelen) == -1) {
rc = prog_sysctlnametomib(mib, &name[0], &sz);
rc = prog_sysctlnametomib("kern.file2", &name[0], &sz);