getpeername function (winsock.h)

The getpeername function retrieves the address of the peer to which a socket is connected.

Syntax

int getpeername(
  SOCKET   s,
  sockaddr *name,
  int      *namelen
);

Parameters

s

A descriptor identifying a connected socket.

name

The SOCKADDR structure that receives the address of the peer.

namelen

A pointer to the size, in bytes, of the name parameter.

Return value

If no error occurs, getpeername returns zero. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

Error code Meaning
WSANOTINITIALISED
A successful WSAStartup call must occur before using this function.
WSAENETDOWN
The network subsystem has failed.
WSAEFAULT
The name or the namelen parameter is not in a valid part of the user address space, or the namelen parameter is too small.
WSAEINPROGRESS
A blocking Windows Sockets 1.1 call is in progress, or the service provider is still processing a callback function.
WSAENOTCONN
The socket is not connected.
WSAENOTSOCK
The descriptor is not a socket.

Remarks

The getpeername function retrieves the address of the peer connected to the socket s and stores the address in the SOCKADDR structure identified by the name parameter. This function works with any address family and it simply returns the address to which the socket is connected. The getpeername function can be used only on a connected socket.

For datagram sockets, only the address of a peer specified in a previous connect call will be returned. Any address specified by a previous sendto call will not be returned by getpeername.

On call, the namelen parameter contains the size, in bytes, of the name buffer. On return, the namelen parameter contains the actual size, in bytes, of the name parameter returned.

Windows Phone 8: This function is supported for Windows Phone Store apps on Windows Phone 8 and later.

Windows 8.1 and Windows Server 2012 R2: This function is supported for Windows Store apps on Windows 8.1, Windows Server 2012 R2, and later.

Requirements

   
Minimum supported client Windows 8.1, Windows Vista [desktop apps | UWP apps]
Minimum supported server Windows Server 2003 [desktop apps | UWP apps]
Target Platform Windows
Header winsock.h (include Winsock2.h)
Library Ws2_32.lib
DLL Ws2_32.dll

See also

Winsock Functions

Winsock Reference

bind

connect

getsockname

sendto

socket