1 #value_indexed 2 CLOCK_REALTIME 0 3 CLOCK_MONOTONIC 1 4 CLOCK_PROCESS_CPUTIME_ID 2 5 CLOCK_THREAD_CPUTIME_ID 3 6 CLOCK_MONOTONIC_RAW 4 7 CLOCK_REALTIME_COARSE 5 8 CLOCK_MONOTONIC_COARSE 6 9 CLOCK_BOOTTIME 7 10 CLOCK_REALTIME_ALARM 8 11 CLOCK_BOOTTIME_ALARM 9 12 CLOCK_SGI_CYCLE 10 13 CLOCK_TAI 11 14
