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