msgsnd

See the current Perl documentation for msgsnd.

Here is our local, out-dated (pre-5.6) version:

msgsnd - send a SysV IPC message to a message queue

msgsnd ID,MSG,FLAGS

Calls the System V IPC function msgsnd to send the message MSG to the message queue ID. MSG must begin with the long integer message type, which may be created with pack("l", $type). Returns TRUE if successful, or FALSE if there is an error. See also IPC::SysV and IPC::SysV::Msg documentation.