Opens a socket of the specified kind and attaches it to filehandle
SOCKET. DOMAIN, TYPE, and PROTOCOL are specified the same as for
the system call of the same name. You should use Socket first
to get the proper definitions imported. See the examples in
perlipc/"Sockets: Client/Server Communication".
On systems that support a close-on-exec flag on files, the flag will be set for the newly opened file descriptor, as determined by the value of $^F. See perlvar/$^F.