net: sockets: Report ZSOCK_POLLHUP when socket is in EOF state

Report ZSOCK_POLLHUP event if peer closed the connection, and thus the
socket is in EOF state.

Signed-off-by: Robert Lubos <[email protected]>

Author: rlubos

subsys/net/lib/sockets/sockets.c

@@ -1364,6 +1364,10 @@ static int zsock_poll_update_ctx(struct net_context *ctx,
 		(*pev)++;
 	}
 
+	if (sock_is_eof(ctx)) {
+		pfd->revents |= ZSOCK_POLLHUP;
+	}
+
 	return 0;
 }