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Who is Connected to Me?

Function: int getpeername (int socket, struct sockaddr *addr, size_t *length_ptr)

The getpeername function returns the address of the socket that socket is connected to; it stores the address in the memory space specified by addr and length_ptr. It stores the length of the address in *length_ptr.

See section Socket Addresses, for information about the format of the address. In some operating systems, getpeername works only for sockets in the Internet domain.

The return value is 0 on success and -1 on error. The following errno error conditions are defined for this function:

EBADF
The argument socket is not a valid file descriptor.

ENOTSOCK
The descriptor socket is not a socket.

ENOTCONN
The socket socket is not connected.

ENOBUFS
There are not enough internal buffers available.

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