gettimeofday man page on Ultrix

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gettimeofday(2)						       gettimeofday(2)

Name
       gettimeofday, settimeofday - get or set date and time

Syntax
       #include <sys/time.h>

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

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

Description
       The  system  call  returns the system's notion of the current Greenwich
       time and the current time zone.	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 min‐
       utes of time westward from Greenwich), and a  flag  that,  if  nonzero,
       indicates  that	Daylight Saving time applies locally during the appro‐
       priate part of the year.

       Only the superuser can set the time of day.

Return Values
       A 0 return value indicates that the call succeeded.  A -1 return	 value
       indicates  an  error occurred, and in this case an error code is stored
       into the global variable errno.

Diagnostics
       The call fails under the following conditions:

       [EFAULT]	      An argument address referenced invalid memory.

       [EPERM]	      A user other than the superuser  attempted  to  set  the
		      time.

See Also
       date(1), stime(2), ctime(3)

							       gettimeofday(2)
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