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LISTEN call z/OS Communications Server: IP CICS Sockets Guide SC27-3649-00 |
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The LISTEN call:
Note: The LISTEN call is not supported for datagram sockets
or raw sockets.
The LISTEN call is typically used by a server to receive
connection requests from clients. When a connection request is received,
a new socket is created by a subsequent ACCEPT call, and the original
socket continues to listen for additional connection requests. The
LISTEN call converts an active socket to a passive socket and conditions
it to accept connection requests from clients. After a socket becomes
passive, it cannot initiate connection requests.
Note: The BACKLOG
value specified on the LISTEN command cannot be greater than the value
configured by the SOMAXCONN statement in the stack's TCPIP PROFILE
(default=10); no error is returned if a larger backlog is requested.
If you want a larger backlog, update the SOMAXCONN statement. See
the z/OS Communications Server: IP Configuration
Reference for details.
The following requirements apply to this call:
Figure 1 shows an example of LISTEN call instructions. Figure 1. LISTEN call instruction example
For equivalent PL/I and assembler language declarations, see Converting parameter descriptions. |
Copyright IBM Corporation 1990, 2014
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