msgrcv ID,VAR,SIZE,TYPE,FLAGS
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 if a message is received, the message type will be the
first thing in VAR, and the maximum length of VAR is SIZE plus the size
of the message type. Returns TRUE if successful, or FALSE if there is
an error.
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