msgget(2) - perldoc - phpman

    msgget KEY,FLAGS
            Calls the System V IPC function msgget(2). Returns the message
            queue id, or "undef" on error. See also "SysV IPC" in perlipc
            and the documentation for "IPC::SysV" and "IPC::Msg".

            Portability issues: "msgget" in perlport.