clock_settime(2) - Linux man page

Name

clock_settime - Set the specified clock

Synopsis

long sys_clock_settime (clockid_t which_clock, const struct timespec *tp);

Description

clock_settime sets the specified clock, which_clock, to the value specified by tp. The values that clockid_t currently supports for POSIX.1b timers, defined in include/linux/time.h, are:

CLOCK_REALTIME: Systemwide realtime clock.
CLOCK_MONOTONIC: Represents monotonic time. Cannot be set.
CLOCK_PROCESS_CPUTIME_ID: High resolution per-process timer.
CLOCK_THREAD_CPUTIME_ID: Thread-specific timer.
CLOCK_REALTIME_HR: High resolution version of CLOCK_REALTIME.
CLOCK_MONOTONIC_HR: High resolution version of CLOCK_MONOTONIC.

Return Value

clock_gettime returns 0 on success; otherwise, it returns one of the errors listed in the "Errors" section.

Errors

-EINVAL

An invalid which_clock value was specified.
-EFAULT: Can not copy tp value to kernel space.

Author

Niki Rahimi