sunos man page for gettimeofday

gettimeofday(3UCB)				     SunOS/BSD Compatibility Library Functions					gettimeofday(3UCB)

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

SYNOPSIS
       /usr/ucb/cc[ flag ... ] file ...
       #include <sys/time.h>

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

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

DESCRIPTION
       The  system's notion of the current Greenwich time is obtained with the gettimeofday() call, and set with the settimeofday() call. The cur-
       rent 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 clock ticks.

       long tv_sec;	 /* seconds since Jan. 1, 1970 */
       long tv_usec;	   /* and microseconds */

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

       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 VALUES
       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
       adjtime(2), ctime(3C), gettimeofday(3C), TIMEZONE(4)

NOTES
       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-thread applications is unsupported.

       tzp is ignored in SunOS 5.X releases.

       tv_usec is always 0.

SunOS 5.10							    18 Feb 1993 						gettimeofday(3UCB)