clock_gettime(2) -- Linux man page

 

NAME

clock_gettime - Return the current timespec value of tp for the specified clock  

SYNOPSIS

long sys_clock_gettime (clockid_t which_clock, struct timespec *tp);
 

DESCRIPTION

clock_gettime returns the current timespec value of tp for the specific clock, which_clock. The values that clockid_t currently supports for POSIX.1b timers, as 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 coy to tp value.
 

SEE ALSO

clock_getres(2), clock_nanosleep(2), clock_settime(2)  

AUTHOR

Niki Rahimi