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OpenDarwin 7.2.1 - man page for adjtime (opendarwin section 2)

ADJTIME(2)			     BSD System Calls Manual			       ADJTIME(2)

     adjtime -- correct the time to allow synchronization of the system clock

     #include <sys/time.h>

     adjtime(const struct timeval *delta, struct timeval *olddelta);

     Adjtime() makes small adjustments to the system time, as returned by gettimeofday(2),
     advancing or retarding it by the time specified by the timeval delta.  If delta is negative,
     the clock is slowed down by incrementing it more slowly than normal until the correction is
     complete.	If delta is positive, a larger increment than normal is used.  The skew used to
     perform the correction is generally a fraction of one percent.  Thus, the time is always a
     monotonically increasing function.  A time correction from an earlier call to adjtime() may
     not be finished when adjtime() is called again.  If olddelta is non-nil, the structure
     pointed to will contain, upon return, the number of microseconds still to be corrected from
     the earlier call.

     This call may be used by time servers that synchronize the clocks of computers in a local
     area network.  Such time servers would slow down the clocks of some machines and speed up
     the clocks of others to bring them to the average network time.

     The call adjtime() is restricted to the super-user.

     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.

     Adjtime() will fail if:

     [EFAULT]		An argument points outside the process's allocated address space.

     [EPERM]		The process's effective user ID is not that of the super-user.

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

     R. Gusella and S. Zatti, TSP: The Time Synchronization Protocol for UNIX 4.3BSD.

     The adjtime() function call appeared in 4.3BSD.

4.3 Berkeley Distribution		   June 4, 1993 		4.3 Berkeley Distribution

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