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clock_gettime, clock_gettime64 - Get time of a specified clock
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Definition | #include <time.h> int clock_gettime(clockid_t clk_id, struct timespec *tp); int clock_gettime64(clockid_t clk_id, struct timespec64 *tp); In the structure which points to tp, clock_gettime and clock_gettime64 supply the time of the clock that is pecified by clk_id as the number of seconds and milliseconds which have passed since the reference date (epoch). Only the system-wide real time clock CLOCK_REALTIME is supported. It supplies the number of seconds and nanoseconds which have passed since the reference date (epoch). The reference date is 1/1/1970 00:00:00. |
Return val. | 0 -1 | if successful. if an error occurs. errno is set to indicate the error. |
Error | clock_gettime will fail, if: EINVAL the specified clk_id is not supported. |
See also | ftime |