adjfreq man page on OpenBSD

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

     adjfreq - correct the rate of the system clock

     #include <sys/types.h>
     #include <sys/time.h>

     adjfreq(const int64_t *freq, int64_t *oldfreq);

     adjfreq() adjusts the rate in which time progresses if freq is non-null.
     The unit of the rate of adjustment is nanoseconds per second, shifted
     left 32 bits to allow for fractional values.

     If oldfreq is non-null, the current value is returned.

     Only the superuser may adjust the frequency.

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

     adjfreq() will fail if:

     [EFAULT]	   Either of the arguments point outside the process's
		   allocated address space.

     [EPERM]	   The freq argument is non-null and the process's effective
		   user ID is not that of the superuser.

     date(1), adjtime(2), gettimeofday(2), ntpd(8), timed(8), timedc(8)

     R. Gusella and S. Zatti, TSP: The Time Synchronization Protocol for UNIX

     The adjfreq() function call first appeared in OpenBSD 4.0.

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9

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