: <https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getpeername.2.html> (archived)
 * illumos: <https://illumos.org/man/3SOCKET/getpeername>
 * Windows: <https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getpeername>