gettimeofday(3)    UNIX System V(BSD Compatibility Package)     gettimeofday(3)


NAME
      gettimeofday, settimeofday - get or set the date and time

SYNOPSIS
      cc [ flag. . . ] file . . . -lucb

      #include <sys/time.h>

      int gettimeofday(tp, tzp)
      struct timeval *tp;
      struct timezone *tzp;      /* obsolete */

      int settimeofday(tp, tzp)
      struct timeval *tp;
      struct timezone *tzp;      /* obsolete */

DESCRIPTION
      The system's notion of the current Greenwich time is obtained with the
      gettimeofday call, and set with the settimeofday call.  The current time
      is expressed in elapsed seconds and microseconds since 00:00 GMT, January
      1, 1970 (zero hour).  The resolution of the system clock is hardware
      dependent; the time may be updated continuously, or in ``ticks.''

      tp points to a timeval structure, which includes the following members:

            long tvsec;  /* seconds since Jan. 1, 1970 */
            long tvusec; /* and microseconds */

      If tp is a NULL pointer, the current time information is not returned or
      set.

      tzp is an obsolete pointer formerly used to get and set timezone
      information.  tzp is now ignored.  Timezone information is now handled
      using the TZ environment variable; see timezone(4).

      Only the privileged user may set the time of day.

RETURN VALUE
      A -1 return value indicates an error occurred; in this case an error code
      is stored in the global variable errno.

ERRORS
      The following error codes may be set in errno:

      EINVAL         tp specifies an invalid time.

      EPERM          A user other than the privileged user attempted to set the
                     time.

SEE ALSO
      date(1) in the User's Reference Manual
      adjtime(2), ctime(3C), gettimeofday(3C), timezone(4) in the Programmer's


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gettimeofday(3)    UNIX System V(BSD Compatibility Package)     gettimeofday(3)


      Reference Manual

NOTES
      Time is never correct enough to believe the microsecond values.

      tzp is ignored.
















































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