-static int tls_socket_read (CONNECTION * conn, char *buf, size_t len);
-static int tls_socket_write (CONNECTION * conn, const char *buf, size_t len);
+static int tls_socket_read (CONNECTION * conn, char *buf, ssize_t len);
+static int tls_socket_write (CONNECTION * conn, const char *buf, ssize_t len);