[GitHub] [nuttx] cederom commented on issue #8858: Issues with adjtime implementation / Build failure.

["cederom (via GitHub)" <gi...@apache.org>]

cederom commented on issue #8858:
URL: https://github.com/apache/nuttx/issues/8858#issuecomment-1478404539

   Here are some references :-)
   
   https://github.com/freebsd/freebsd-src/blob/master/contrib/ntp/libntp/adjtime.c
   
   https://github.com/freebsd/freebsd-src/blob/master/contrib/ntp/include/ntp_syscall.h
   
   https://github.com/freebsd/freebsd-src/blob/main/sys/kern/kern_time.c
   
   And the man page :-)
   
   https://man.freebsd.org/cgi/man.cgi?query=adjtime&sektion=2&apropos=0&manpath=FreeBSD+13.1-RELEASE+and+Ports
   
        The adjtime() system call makes small adjustments to the system time, as
        returned by gettimeofday(2), advancing or retarding it by the time    speci-
        fied 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 not a null    pointer, the
        structure pointed to will contain,    upon return, the number    of microsec-
        onds 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 adjtime() system call is restricted to    the super-user.
   
   
   Hope that helps :-)


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