l>
 * macOS: <https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/socketpair.2.html> (archived, actually for iOS)
 * NetBSD: <https://man.netbsd.org/socketpair.2>
 * OpenBSD: <https://man.openbsd.org/socketpair.2>
 * iOS: <https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/socketpair.2.html> (archived)
 * illumos: <https://illumos.org/man/3SOCKET/socketpair>