Ubuntu Feisty 7.04 manual page repository

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NAME

        adjtime - smoothly tune kernel clock
 

SYNOPSIS

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

DESCRIPTION

        This function speeds up or slows down the system clock in order to make
        a gradual adjustment.  This ensures that the calendar time reported  by
        the  system  clock  is always monotonically increasing, which might not
        happen if you simply set the clock.
 
        The delta argument specifies a relative adjustment to be  made  to  the
        clock  time.   If  negative, the system clock is slowed down fora while
        until it has lost this much elapsed  time.   If  positive,  the  system
        clock is speeded up for a while.
 
        If  the  olddelta  argument is not a null pointer, the adjtime function
        returns information about any previous time adjustment that has not yet
        completed.
 
        This  function is typically used to synchronize the clocks of computers
        in a local network.  You must be a privileged user to use it.
        The adjtime function returns 0 on success and -1 on  failure  and  sets
        the external variable errno accordingly.
 

ERRORS

        EPERM  The  calling  process  does not have enough privileges to access
               the clock.
adjtimex(2)  function  to  perma‐
        nently change the system clock speed.
        This function is derived from 4.3 BSD and SVr4.
settimeofday(2)