clock_getres man page on OpenBSD

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CLOCK_GETTIME(2)	  OpenBSD Programmer's Manual	      CLOCK_GETTIME(2)

NAME
     clock_gettime, clock_settime, clock_getres - get/set/calibrate date and
     time

SYNOPSIS
     #include <sys/time.h>

     int
     clock_gettime(clockid_t clock_id, struct timespec *tp);

     int
     clock_settime(clockid_t clock_id, const struct timespec *tp);

     int
     clock_getres(clockid_t clock_id, struct timespec *tp);

DESCRIPTION
     The clock_gettime() and clock_settime() allow the calling process to
     retrieve or set the value used by a clock which is specified by clock_id.

     clock_id can be one of four values: CLOCK_REALTIME for time that
     increments as a wall clock should, CLOCK_VIRTUAL for time that increments
     only when the CPU is running in user mode on behalf of the calling
     process, CLOCK_PROF for time that increments when the CPU is running in
     user or kernel mode, or CLOCK_MONOTONIC for time that increments at a
     steady rate (monotonically).

     The structure pointed to by tp is defined in <sys/time.h> as:

	   struct timespec {
		   time_t  tv_sec;	   /* seconds */
		   long	   tv_nsec;	   /* and nanoseconds */
	   };

     Only the superuser may set the time of day.  If the system securelevel is
     greater than 1 (see init(8)), the time may only be advanced.  This
     limitation is imposed to prevent a malicious superuser from setting
     arbitrary time stamps on files.  The system time can still be adjusted
     backwards using the adjtime(2) system call even when the system is
     secure.

     The resolution (granularity) of a clock is returned by the clock_getres()
     call.  This value is placed in a (non-null) *tp.

RETURN VALUES
     A 0 return value indicates that the call succeeded.  A -1 return value
     indicates an error occurred, and in this case an error code is stored
     into the global variable errno.

ERRORS
     The following error codes may be set in errno:

     [EINVAL]	   The clock_id was not a valid value.

     [EFAULT]	   The tp argument address referenced invalid memory.

     [EPERM]	   A user other than the superuser attempted to set the time.

SEE ALSO
     date(1), adjtime(2), ctime(3), timed(8)

STANDARDS
     The clock_gettime(), clock_settime(), and clock_getres() functions
     conform to IEEE Std 1003.1b-1993 (``POSIX'').

OpenBSD 4.9		       December 9, 2007			   OpenBSD 4.9
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