Calls the System V IPC function msgsnd to send the message MSG to the message queue ID. MSG must begin with the native long integer message type, be followed by the length of the actual message, and then finally the message itself. This kind of packing can be achieved with pack("l! a*", $type, $message). Returns true if successful, false on error. See also "SysV IPC" in perlipc and the documentation for IPC::SysV and IPC::Msg.
Portability issues: "msgsnd" in perlport.