Perl5 リファレンス


       send SOCKET,MSG,FLAGS
               Sends a message on a socket.  Takes the same flags
               as the system call of the same name.  On
               unconnected sockets you must specify a destination
               to send TO, in which case it does a C `sendto'.
               Returns the number of characters sent, or the
               undefined value if there is an error.  The C
               system call sendmsg(2) is currently unimplemented.
               See the UDP: Message Passing entry in the perlipc
               manpage for examples.