LISTEN(2) System Calls LISTEN(2)
listen - listen for connections on a socket
int listen (int s, int backlog);
To accept connections, a socket is first created with socket(2), a
willingness to accept incoming connections and a queue limit for incom-
ing connections are specified with listen, and then the connections are
accepted with accept(2). The listen call applies only to sockets of
type SOCK_STREAM or SOCK_SEQPACKET.
The backlog parameter defines the maximum length the queue of pending
connections may grow to. If a connection request arrives with the
queue full the client may receive an error with an indication of ECON-
NREFUSED, or, if the underlying protocol supports retransmission, the
request may be ignored so that retries may succeed.
A 0 return value indicates success; -1 indicates an error.
Listen will fail if:
EBADF The argument s is not a valid descriptor.
The argument s is not a socket.
The socket is not of a type that supports the operation
accept(2), connect(2), socket(2)
The backlog is currently limited (silently) to 32.
The listen function call appeared in 4.2BSD. The first appearance in
GNO was in v2.0.5.
GNO 16 January 1997 LISTEN(2)
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