-extern long flush_socket(jb_socket fd, struct iob *iob);
-extern jb_err add_to_iob(struct iob *iob, const size_t buffer_limit, char *src, long n);
+extern long flush_iob(jb_socket fd, struct iob *iob, unsigned int delay);
+extern int can_add_to_iob(const struct iob *iob, const size_t buffer_limit, size_t n);
+extern jb_err add_to_iob(struct iob *iob, const size_t buffer_limit, const char *src, long n);
+extern void clear_iob(struct iob *iob);