11
#define TFD_NONBLOCK O_NONBLOCK
12
#define TFD_CLOEXEC O_CLOEXEC
14
#define TFD_TIMER_ABSTIME 1
16
int timerfd_create(int, int);
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int timerfd_settime(int, int, const struct itimerspec *, struct itimerspec *);
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int timerfd_gettime(int, struct itimerspec *);