posix: implement fattach() and fdetach() #68464
Merged
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This is part of the See #51211 (RFC #51211).
fattach()
andfdetach()
are required as part of _XOPEN_STREAMS Option Group.For more information, please refer to https://pubs.opengroup.org/onlinepubs/9699919799/functions/fattach.html
Fixes #66973
Fixes #66974