source: azure_iot_hub/trunk/musl-1.1.18/include/sys/time.h@ 388

#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

#ifdef __cplusplus
}
#endif
#endif