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

 

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 incre‐
      menting 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 correc‐
      tion 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 com‐
      puters 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.
      The adjtime() function returns the value 0 if successful; otherwise the
      value -1 is returned and the global variable errno is set to indicate the
      error.
 

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.
      date(1), gettimeofday(2), 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.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.
 

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