Prototypes for send and recv. Fixed send (pass null address) and sendto

(fail when a null address is passed to a socket that is not connected).

lib/ip/send.c

@@ -3,9 +3,6 @@
 
 ssize_t send(int socket, const void *buffer, size_t length, int flags)
 {
-	struct sockaddr sa;
-
-	sa.sa_family= AF_UNSPEC;
-	return sendto(socket, buffer, length, flags, &sa, sizeof(sa));
+	return sendto(socket, buffer, length, flags, NULL, 0);
 }
 

lib/ip/sendto.c

@@ -68,6 +68,12 @@ static ssize_t _udp_sendto(int socket, const void *message, size_t length,
 	if ((udpoptp->nwuo_flags & NWUO_RP_ANY) ||
 		(udpoptp->nwuo_flags & NWUO_RA_ANY))
 	{
+		if (!dest_addr)
+		{
+			errno= ENOTCONN;
+			return -1;
+		}
+
 		/* Check destination address */
 		if (dest_len < sizeof(*sinp))
 		{