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X/Open Networking Services Library Functionslisten(3XNET)


NAME

 listen - listen for socket connections and limit the queue of incoming connections

SYNOPSIS

 
cc [ flag ... ] file ... -lxnet [ library ... ]
#include <sys/socket.h>
int listen(int socket, int backlog);

DESCRIPTION

 

The listen() function marks a connection-mode socket, specified by the socket argument, as accepting connections, and limits the number of outstanding connections in the socket's listen queue to the value specified by the backlog argument.

If listen() is called with a backlog argument value that is less than 0, the function sets the length of the socket's listen queue to 0.

The implementation may include incomplete connections in the queue subject to the queue limit. The implementation may also increase the specified queue limit internally if it includes such incomplete connections in the queue subject to this limit.

Implementations may limit the length of the socket's listen queue. If backlog exceeds the implementation-dependent maximum queue length, the length of the socket's listen queue will be set to the maximum supported value.

The socket in use may require the process to have appropriate privileges to use the listen() function.

RETURN VALUES

 

Upon successful completions, listen() returns 0. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

 

The listen() function will fail if:

EBADF
The socket argument is not a valid file descriptor.
EDESTADDRREQ
The socket is not bound to a local address, and the protocol does not support listening on an unbound socket.
EINVAL
The socket is already connected.
ENOTSOCK
The socket argument does not refer to a socket.
EOPNOTSUPP
The socket protocol does not support listen().

The listen() function may fail if:

EACCES
The calling process does not have the appropriate privileges.
EINVAL
The socket has been shut down.
ENOBUFS
Insufficient resources are available in the system to complete the call.

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

accept(3XNET), connect(3XNET), socket(3XNET), attributes(5)


SunOS 5.9Go To TopLast Changed 8 May 1998

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.