const syscall.IPV6_V6ONLY

3 uses

	syscall (current package)
		zerrors_darwin_arm64.go#L548: 	IPV6_V6ONLY                       = 0x1b

	net
		ipsock_posix.go#L56: 		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, probes[i].value)
		sockopt_bsd.go#L32: 		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))