text: #ifndef _SYS_TIME_H
  #define _SYS_TIME_H
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include <features.h>
  
  #include <sys/select.h>
  
  int gettimeofday (struct timeval *__restrict, void *__restrict);
  
  #define ITIMER_REAL    0
  #define ITIMER_VIRTUAL 1
  #define ITIMER_PROF    2
  
  struct itimerval {
  	struct timeval it_interval;
  	struct timeval it_value;
  };
  
  int getitimer (int, struct itimerval *);
  int setitimer (int, const struct itimerval *__restrict, struct itimerval *__restrict);
  int utimes (const char *, const struct timeval [2]);
  
  #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
  struct timezone {
  	int tz_minuteswest;
  	int tz_dsttime;
  };
  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) (void) ( (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) (void) ( (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--) )
  #endif
  
  #if defined(_GNU_SOURCE)
  #define TIMEVAL_TO_TIMESPEC(tv, ts) ( \
  	(ts)->tv_sec = (tv)->tv_sec, \
  	(ts)->tv_nsec = (tv)->tv_usec * 1000, \
  	(void)0 )
  #define TIMESPEC_TO_TIMEVAL(tv, ts) ( \
  	(tv)->tv_sec = (ts)->tv_sec, \
  	(tv)->tv_usec = (ts)->tv_nsec / 1000, \
  	(void)0 )
  #endif
  
  #if _REDIR_TIME64
  __REDIR(gettimeofday, __gettimeofday_time64);
  __REDIR(getitimer, __getitimer_time64);
  __REDIR(setitimer, __setitimer_time64);
  __REDIR(utimes, __utimes_time64);
  #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
  __REDIR(futimes, __futimes_time64);
  __REDIR(futimesat, __futimesat_time64);
  __REDIR(lutimes, __lutimes_time64);
  __REDIR(settimeofday, __settimeofday_time64);
  __REDIR(adjtime, __adjtime64);
  #endif
  #endif
  
  #ifdef __cplusplus
  }
  #endif
  #endif
  