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NetBSD 6.1.5 - man page for adjtime (netbsd section 2)

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

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

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/time.h>

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

DESCRIPTION
     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.

     If the calling user is not the super user, then the adjtime() function in the standard C
     library will try to use the clockctl(4) device if present, thus making possible for non
     privileged users to adjust the system time.  If clockctl(4) is not present or not accessi-
     ble, then adjtime() reverts to the adjtime() system call, which is restricted to the super
     user.

RETURN VALUES
     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.

ERRORS
     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.

SEE ALSO
     date(1), gettimeofday(2), clockctl(4), timed(8), timedc(8)

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

HISTORY
     The adjtime() function call appeared in 4.3BSD.

BSD					   June 4, 1993 				      BSD


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