unix_s_socketpair 3674 ext/socket/socket.c     rb_define_singleton_method(rb_cUNIXSocket, "socketpair", unix_s_socketpair, -1);
unix_s_socketpair 3675 ext/socket/socket.c     rb_define_singleton_method(rb_cUNIXSocket, "pair", unix_s_socketpair, -1);