+int futimes(int, const struct timeval [2]);
+int futimesat(int, const char *, const struct timeval [2]);
+int lutimes(const char *, const struct timeval [2]);
+int settimeofday(const struct timeval *, const struct timezone *);
+int adjtime (const struct timeval *, struct timeval *);
+#define timerisset(t) ((t)->tv_sec || (t)->tv_usec)
+#define timerclear(t) ((t)->tv_sec = (t)->tv_usec = 0)
+#define timercmp(s,t,op) ((s)->tv_sec == (t)->tv_sec ? \
+ (s)->tv_usec op (t)->tv_usec : (s)->tv_sec op (t)->tv_sec)
+#define timeradd(s,t,a) ( (a)->tv_sec = (s)->tv_sec + (t)->tv_sec, \
+ ((a)->tv_usec = (s)->tv_usec + (t)->tv_usec) >= 1000000 && \
+ ((a)->tv_usec -= 1000000, (a)->tv_sec++) )
+#define timersub(s,t,a) ( (a)->tv_sec = (s)->tv_sec - (t)->tv_sec, \
+ ((a)->tv_usec = (s)->tv_usec - (t)->tv_usec) < 0 && \
+ ((a)->tv_usec += 1000000, (a)->tv_sec--) )