adjtime man page on HP-UX

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adjtime(2)							    adjtime(2)

       adjtime() - correct the time to synchronize the system clock

       The  function  adjusts  the  current  time  of the system.  The time is
       either advanced or retarded by the amount  of  time  specified  in  the
       pointed to by delta.

       The  adjustment	is  made by applying small correctional adjustments to
       the value of current time that the system keeps.	 The  time  is	always
       increasing  monotonically, but at a rate slightly slower or faster than

       A time correction for an earlier call to may not be  complete  when  is
       called.	 The  second  call to stops the first call to if delta is non-
       NULL, but does not undo the effects of the previous call.  If delta  is
       NULL, then no time correction will be done.

       If olddelta is not a NULL pointer, then the structure it points to will
       contain, upon return, the number of seconds and/or  microseconds	 still
       to  be corrected from the earlier call.	If olddelta is a NULL pointer,
       the corresponding information will not be returned.

       The call to returns immediately, though its effect will continue	 until
       the  whole  correction  is  made	 or  until modified by another call to
       either with a non-NULL delta or to change the system time (see

       Only a user with appropriate privileges can call	 successfully  with  a
       non-NULL delta.	Any user can call with a NULL delta to report the cor‐
       rection left from the previous call.

       is defined in as having	at  least  2  members,	tv_sec	(seconds)  and
       tv_usec (microseconds).

       When  is	 called,  if  the  delta.tv_sec field is greater than 31536000
       (approx. 365 days), or less than −31536000, then fails with an errno of
       The tv_usec field is not used in the calculations to determine the lim‐
       its, and so the actual limits on adjustments are seconds.

       Note that the desired seconds may be negative.  Since the type  of  the
       tv_sec field is (unsigned long), any negative values for tv_sec need to
       be cast.

       Any olddelta value returned by the function will be returned such  that
       the signs of non-zero members are the same.

   Interaction with Other System Calls
       A call to change the system time terminates the correction currently in
       effect.	A subsequent call to will  return  {0,	0}  for	 the  olddelta
       parameter.  This includes system calls such as and

   Security Restrictions
       This  system call requires the privilege in order to successfully usa a
       non-NULL delta.	Processes owned by the superuser have this  privilege.
       Processes  owned	 by  other users may have this privilege, depending on
       system configuration.  See privileges(5)	 for  more  information	 about
       privileged access on systems that support fine-grained privileges.

       Upon successful completion, returns a value of 0; otherwise, it returns
       a value −1 and sets to indicate the error.

       fails if one or more of the following is true:

	      if the process does not have the appropriate privilege.

	      The address specified for
			     delta (or olddelta) is invalid.

	      If	     delta.tv_sec is greater  than  31536000  (approx.
			     365   days)   or	less   than   −31536000.   The
			     delta.tv_usec field is not used in calculation of
			     these  limits.   If the user wants to adjust time
			     greater than these limits, an appropriate	alter‐
			     native interface should be used.

       The following code snippet will take the time forward 20 minutes.

       The  following  code fragment will repeatedly call a user-defined func‐
       tion until the adjustment requested in a previous call to (called  from
       either the same process or another process) is completed.

       was developed by the University of California, Berkeley and AT&T.

       date(1),	  gettimeofday(2),   stime(2),	 clock_settime(2),  clocks(2),
       getitimer(2), setitimer(2), alarm(2), privileges(5).


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