getclock(3)						     Library Functions Manual						       getclock(3)

NAME

       getclock - Gets current value of system-wide clock.

LIBRARY

       Standard C Library (libc.a)

SYNOPSIS

       #include <sys/timers.h>

       int getclock(	  int clktyp,	   struct timespec *tp) ;

PARAMETERS

       Identifies a system-wide clock.	Points to a timespec structure space where the current value of the system-wide clock is stored.

DESCRIPTION

       The getclock() function sets the current value of the clock specified by clktyp into the location pointed to by the tp parameter.

       The  clktyp  parameter is given as a symbolic constant name, as defined in the sys/timers.h include file.  Only the TIMEOFDAY symbolic con-
       stant, which specifies the normal time-of-day clock to access for system-wide time, is supported.

       For the clock specified by TIMEOFDAY, the value returned by this function is the elapsed time since the epoch.  The epoch is referenced	to
       00:00:00 CUT (Coordinated Universal Time) 1 Jan 1970.

       The getclock() function returns a timespec structure, which is defined in the sys/timers.h header file.	It has the following members:

       time_t	tv_sec	  Elapsed time in seconds since the epoch
	 long	tv_nsec   Elapsed time as a fraction of a second since
			  the epoch (expressed in nanoseconds)

       The time interval expressed by the members of this  structure is ((tv_sec * 10^9) + (tv_nsec)) nanoseconds.

NOTES

       Trial use

RETURN VALUES

       Upon  successful  completion,  the  getclock()  function returns a value of 0 (zero).  Otherwise, getclock() returns a value of -1 and sets
       errno to indicate the error.

ERRORS

       If the getclock() function fails, errno is to one of the following values: The clktyp parameter does not specify a known system-wide clock.
       An error occurred when the system-wide clock specified by the clktyp parameter was accessed.

RELATED INFORMATION

       Functions: gettimeofday(2), gettimer(3), setclock(3), time(3) delim off

																       getclock(3)