=over =item socketpair SOCKET1,SOCKET2,DOMAIN,TYPE,PROTOCOL Creates an unnamed pair of sockets in the specified domain, of the specified type. DOMAIN, TYPE, and PROTOCOL are specified the same as for the system call of the same name. If unimplemented, yields a fatal error. Returns true if successful. On systems that support a close-on-exec flag on files, the flag will be set for the newly opened file descriptors, as determined by the value of $^F. See L. Some systems defined C in terms of C, in which a call to C is essentially: use Socket; socketpair(Rdr, Wtr, AF_UNIX, SOCK_STREAM, PF_UNSPEC); shutdown(Rdr, 1); # no more writing for reader shutdown(Wtr, 0); # no more reading for writer See L for an example of socketpair use. =back