There seems to be a standard socket API in the Cosmopolitan clib though: https://github.com/jart/cosmopolitan/tree/master/libc/sock https://github.com/jart/cos

There seems to be a standard socket API in the Cosmopolitan clib though: https://github.com/jart/cosmopolitan/tree/master/libc/sock https://github.com/jart/cosmopolitan/tree/master/libc/sock ..and that also seems to have WinSock support: https://github.com/jart/cosmopolitan/blob/master/libc/sock/connect-nt.c https://github.com/jart/cosmopolitan/blob/master/libc/sock/c... (also Windows is probably the only non-POSIX OS that matters - and APE is obviously only portable to systems it specifically supports, it can't support systems it doesn't even know about, no matter if it is a "POSIX system" or not).