GETTIMEOFDAY(2)         COMMAND REFERENCE         GETTIMEOFDAY(2)



NAME
     gettimeofday, settimeofday - get/set date and time

SYNOPSIS
     #include <sys/time.h>

     gettimeofday(tp, tzp)
     struct timeval *tp;
     struct timezone *tzp;

     settimeofday(tp, tzp)
     struct timeval *tp;
     struct timezone *tzp;

DESCRIPTION
     gettimeofday returns the system's current Greenwich time and
     time zone in the structures pointed to by tp and tzp.
     settimeofday sets the time using the contents of the
     structures.  Only the superuser can set the time.

     Refer to date(1) for more details.

     Time returned is expressed relative in seconds and
     microseconds since midnight January 1, 1970.

     The structures pointed to by tp and tzp are defined in
     <sys/time.h> as:

          struct timeval {
               long tv_sec;        /* seconds since Jan. 1, 1970 */
               long tv_usec;  /* and microseconds */
          };

          struct timezone {
               int  tz_minuteswest;     /* of Greenwich */
               int  tz_dsttime;    /* type of dst correction to apply */
          };

     The timezone structure indicates the local time zone
     measured in minutes of time westward from Greenwich.  The
     flag tz_dsttime, if nonzero, indicates that Daylight Saving
     time applies locally during the appropriate part of the
     year.

DIAGNOSTICS
     If gettimeofday and settimeofday fail, they can set the
     following error in errno:

     [EFAULT]    An argument address references invalid memory.

     In addition, settimeofday can set the following error:




Printed 4/6/89                                                  1

GETTIMEOFDAY(2)         COMMAND REFERENCE         GETTIMEOFDAY(2)



     [EPERM]     The caller is not the super-user.

RETURN VALUE
     Upon successful completion, a value of 0 is returned.
     Otherwise, a value of -1 is returned and errno is set to
     indicate the error.

CAVEATS
     Time is never correct enough to believe the microsecond
     values.  There should be a mechanism by which, at least,
     local clusters of systems might synchronize their clocks to
     millisecond granularity.

     If tp is NULL, the time system time will not be returned or
     set.  If tzp is NULL, the time zone information will not be
     returned or set.

SEE ALSO
     date(1) and ctime(3c).




































Printed 4/6/89                                                  2

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sy:534,1597;
de:2131,1507;
di:3638,711;4853,52;
rv:4905,280;
ca:5185,460;
se:5645,164;
%%index%%000000000132