getsockname()

Description

Get the local name for a socket.

#include <winsock.h>

int PASCAL FAR getsockname(SOCKET s, struct sockaddr FAR * name, int FAR * namelen);

s

A descriptor identifying a bound socket.
name
Receives the address (name) of the socket.
namelen
The size of the name buffer.

Remarks

getsockname() retrieves the current name for the specified socket descriptor in name. It is used on a bound and/or connected socket specified by the s parameter. The local association is returned. This call is especially useful when a connect() call has been made without doing a bind() first; this call provides the only means by which you can determine the local association which has been set by the system.

On return, the namelen argument contains the actual size of the name returned in bytes.

If a socket was bound to INADDR_ANY, indicating that any of the host's IP addresses should be used for the socket, getsockname() will not necessarily return information about the host IP address, unless the socket has been connected with connect() or accept() A Windows Sockets application must not assume that the IP address will be changed from INADDR_ANY unless the socket is connected. This is because for a multi-homed host the IP address that will be used for the socket is unknown unless the socket is connected.

Return Value

If no error occurs, getsockname() returns 0. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code may be retrieved by calling WSAGetLastError()

Error Codes

WSANOTINITIALISED

A successful WSAStartup() must occur before using this API.
WSAENETDOWN
The Windows Sockets implementation has detected that the network subsystem has failed.
WSAEFAULT
The namelen argument is not large enough.
WSAEINPROGRESS
A blocking Windows Sockets operation is in progress.
WSAENOTSOCK
The descriptor is not a socket.
WSAEINVAL
The socket has not been bound to an address with bind()

See Also

bind(), socket(), getpeername()

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