For quite some versions that modern networking APIs on macOS using Objective-C frameworks, starting in 2018.
See WWDC 2018's "Introducing Network.framework, A modern alternative to sockets".
NeXTSTEP might have been a UNIX, and macOS derives from it, but the whole UNIX story has always been to bring UNIX software into the platform, not to make it easier to move elsewhere.
Regardless, even if they renew the certification, they aren't obliged to expose in the classical POSIX APIs more than what the certification requires in features, or happens to be optional, implementation defined.
As anyone that has painfully tried to write POSIX portable code across big iron UNIX is aware of.
> Regardless, even if they renew the certification, they aren't obliged to expose in the classical POSIX APIs more than what the certification requires in features, or happens to be optional, implementation defined.
getaddrinfo() is part of POSIX, so it would be necessary to expose it:
* https://pubs.opengroup.org/onlinepubs/9699969599/functions/g... (2004)
* https://pubs.opengroup.org/onlinepubs/9699919799/functions/g... (2017)
* https://pubs.opengroup.org/onlinepubs/9799919799/functions/g... (2024)
macOS is still certified POSIX UNIX
EDIT: maybe not anymore, Sequoia isn't listed yet, https://www.opengroup.org/openbrand/register/xy.htm