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q = number of pending TCP connections for a TCP listener waiting to be accepted by accept - 3 way handshake complete
q0 = number of connnection request in SYN_RCVD that are halfway through the TCP three-way handshake.
max = backlog queue size. Represents a limit on the number of incoming client requests that can be queued at the listening endpoint [ int listen(int s, int backlog); ]
here is a link to dtrace that may help: