-int dgram_bind P((dgram_t *dgram, int *portp));
-void dgram_socket P((dgram_t *dgram, int sock));
-int dgram_send P((char *hostname, int port, dgram_t *dgram));
-int dgram_send_addr P((struct sockaddr_in addr, dgram_t *dgram));
-int dgram_recv P((dgram_t *dgram, int timeout, struct sockaddr_in *fromaddr));
-void dgram_zero P((dgram_t *dgram));
-void dgram_cat P((dgram_t *dgram, const char *fmt, ...))
+int dgram_bind(dgram_t *dgram, in_port_t *portp);
+void dgram_socket(dgram_t *dgram, int sock);
+int dgram_send(char *hostname, in_port_t port, dgram_t *dgram);
+int dgram_send_addr(struct sockaddr_in addr, dgram_t *dgram);
+ssize_t dgram_recv(dgram_t *dgram, int timeout, struct sockaddr_in *fromaddr);
+void dgram_zero(dgram_t *dgram);
+int dgram_cat(dgram_t *dgram, const char *fmt, ...)