le.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendto.2.html> (archived, actually for iOS)
 * NetBSD: <https://man.netbsd.org/sendto.2>
 * OpenBSD: <https://man.openbsd.org/sendto.2>
 * iOS: <https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/sendto.2.html> (archived)
 * illumos: <https://illumos.org/man/3SOCKET/sendto>
 * Windows: <https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-sendto>