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d52d983e5b
per https://pubs.opengroup.org/onlinepubs/9799919799/functions/posix_close.html Add a flag value to fhandler_*::close() and close_with_arch() methods, taking -1 as default argument, used to indicate default close(2) behaviour. The only fhandlers capable of returning EINTR are the INET based socket fhandlers. Handle -1 and POSIX_CLOSE_RESTART equivalent, making close() and posix_close(POSIX_CLOSE_RESTART) behaving identically. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>