std::timespec (3) - Linux Manuals
std::timespec: std::timespec
NAME
Synopsis
Defined in header <ctime>
struct timespec; (since C++17)
Structure holding an interval broken down into seconds and nanoseconds.
Member objects
std::time_t tv_sec whole seconds – >= 0
long tv_nsec nanoseconds – [0, 999999999]
See also
timespec_get returns the calendar time based on a given time base
(since C++17)
tm (class)