#if __GNUC__ >= 4
#define _sd_printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
-#define _sd_hidden_ __attribute__ ((visibility("hidden")))
#else
#define _sd_printf_attr_(a,b)
+#endif
+
+#if (__GNUC__ >= 4) && !defined(SD_EXPORT_SYMBOLS)
+#define _sd_hidden_ __attribute__ ((visibility("hidden")))
+#else
#define _sd_hidden_
#endif
*/
int sd_booted(void) _sd_hidden_;
+/*
+ Controls ongoing disk read-ahead operations during boot-up. The argument
+ must be a string, and either "cancel", "done" or "noreplay".
+
+ cancel = terminate read-ahead data collection, drop collected information
+ done = terminate read-ahead data collection, keep collected information
+ noreplay = terminate read-ahead replay
+*/
+int sd_readahead(const char *action);
+
#ifdef __cplusplus
}
#endif