RTEMS C User's Guide
The clock manager provides support for time of day and other time related capabilities. The directives provided by the clock manager are:
rtems_clock_set - Set system date and time
rtems_clock_get - Get system date and time information
rtems_clock_get_uptime - Get time since boot
rtems_clock_set_nanoseconds_extension - Install the nanoseconds since last tick handler
rtems_clock_tick - Announce a clock tick
RTEMS C User's Guide
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