[lwip-devel] [bug #39718] disconnecting an UDP socket reports an error

[Kai Raschick]

Follow-up Comment #2, bug #39718 (project lwip):

it can be found in the 2013 version of the posix standard:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html

"For SOCK_DGRAM sockets, the peer address identifies where all datagrams are
sent on subsequent send() functions, and limits the remote sender for
subsequent recv() functions. If the sa_family member of address is AF_UNSPEC,
the socket's peer address shall be reset"

This is allready implemented in the function lwip_connect:
if (name_in->sin_family == AF_UNSPEC) {
    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, AF_UNSPEC)n", s));
    err = netconn_disconnect(sock->conn);
  }

The problem is, that a few lines above, an error is returned if
name->sa_family is not eaqual to AF_INET. So the netconn_disconnect function
will never be called.

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