itimerspec - interval for a timer with nanosecond precision

       Describes the initial expiration of a timer, and its interval, in seconds and nanoseconds.

       POSIX.1-2001.

       Standard C library (libc)

       itimerspec - interval for a timer with nanosecond precision

timerfd_create(2), timer_settime(2), timespec(3type)

Linux man-pages 6.9.1                              2024-05-02                                  itimerspec(3type)

       POSIX.1-2008.

#include<time.h>structitimerspec{structtimespecit_interval;  /* Interval for periodic timer */
           structtimespecit_value;     /* Initial expiration */
       };