Calls the System V IPC function msgrcv to receive a message from message queue ID into variable VAR with a maximum message size of SIZE. Note that when a message is received, the message type as a native long integer will be the first thing in VAR, followed by the actual message. This packing may be opened withunpack("l! a*"). Taints the variable. Returns true if successful, or false if there is an error. See also"SysV IPC" in perlipc,IPC::SysV, andIPC::SysV::Msg documentation.
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