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adjtime (2)
  • adjtime (2) ( Solaris man: Системные вызовы )
  • >> adjtime (2) ( FreeBSD man: Системные вызовы )
  • adjtime (3) ( Linux man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

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

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <sys/time.h>
    int adjtime (const struct timeval *delta struct timeval *olddelta);
     

    DESCRIPTION

    The adjtime ();
    system call makes small adjustments to the system time, as returned by gettimeofday(2), advancing or retarding it by the time specified by the timeval Fa delta . If Fa delta is negative, the clock is slowed down by incrementing it more slowly than normal until the correction is complete. If Fa 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 Fa olddelta is not a null pointer, 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 adjtime ();
    system call is restricted to the super-user.  

    RETURN VALUES

    Rv -std adjtime  

    ERRORS

    The adjtime ();
    system call will fail if:

    Bq Er EFAULT
    An argument points outside the process's allocated address space.
    Bq Er EPERM
    The process's effective user ID is not that of the super-user.

     

    SEE ALSO

    date(1), gettimeofday(2), timed(8), timedc(8)
    "TSP: The Time Synchronization Protocol for UNIX 4.3BSD" R. Gusella S. Zatti
     

    HISTORY

    The adjtime ();
    system call appeared in BSD 4.3


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY


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