+#define iochan_setsocketfun(i, f) ((i)->socketfun = (f))
+#define iochan_getsocketfun(i) ((i)->socketfun)
+#define iochan_setmaskfun(i, f) ((i)->maskfun = (f))
+#define iochan_getmaskfun(i) ((i)->maskfun)
+
+IOCHAN iochan_create(int fd, IOC_CALLBACK cb, int flags, const char *name);