extern int usleep(long long usec);
#endif
+#ifndef timeradd
+#define timeradd(a, b, r) do {\
+ (r)->tv_sec = (a)->tv_sec + (b)->tv_sec;\
+ (r)->tv_usec = (a)->tv_usec + (b)->tv_usec;\
+ if((r)->tv_usec >= 1000000)\
+ (r)->tv_sec++, (r)->tv_usec -= 1000000;\
+} while (0)
+#endif
+
+#ifndef timersub
+#define timersub(a, b, r) do {\
+ (r)->tv_sec = (a)->tv_sec - (b)->tv_sec;\
+ (r)->tv_usec = (a)->tv_usec - (b)->tv_usec;\
+ if((r)->tv_usec < 1000000)\
+ (r)->tv_sec--, (r)->tv_usec += 1000000;\
+} while (0)
+#endif
+
#endif /* __DROPIN_H__ */