LISTEN(2) Linux Programmer's Manual LISTEN(2)
NAME
listen - listen for connections on a socket
SYNOPSIS
#include (lt)sys/socket.h(gt)
int listen(int s, int backlog);
DESCRIPTION
To accept connections, a socket is first created with
socket(2), a willingness to accept incoming connections
and a queue limit for incoming 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 ECONNREFUSED, or, if the
underlying protocol supports retransmission, the request
may be ignored so that retries may succeed.
RETURN VALUE
On success, zero is returned. On error, -1 is returned,
and errno is set appropriately.
ERRORS
EBADF The argument s is not a valid descriptor.
ENOTSOCK
The argument s is not a socket.
EOPNOTSUPP
The socket is not of a type that supports the
operation listen.
CONFORMING TO
SVr4, 4.4BSD (the listen function call first appeared in
4.2BSD).
BUGS
If the socket is of type af_inet, and the backlog argument
is greater than the constant SO_MAXCONN (128 in 2.0.23),
it is silently truncated to SO_MAXCONN. For portable
applications don't rely on this value since BSD (and at
least some BSD derived systems) limit the backlog to 5.
SEE ALSO
accept(2), connect(2), socket(2)
BSD Man Page 23 July 1993 1
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