setclock(3)						     Library Functions Manual						       setclock(3)

NAME

       setclock - Sets value of system-wide clock

LIBRARY

       Standard C Library (libc.a)

SYNOPSIS

       #include <sys/timers.h>
       int setclock(	  int clktyp,	   struct timespec *val) ;

PARAMETERS

       Specifies  a  system-wide  clock whose symbolic name must be TIMEOFDAY.	Points to the location where the value of the time to set into the
       clock specified by the clktyp parameter is stored.

DESCRIPTION

       The setclock() function sets a time value into the system-wide clock whose symbolic name is specified by the clktyp parameter,  which  must
       be TIMEOFDAY, defined in the sys/timers.h header file.

       The  source  of the current value of time set into the system-wide time-of-day clock by this function is stored in space reserved by a type
       timespec structure pointed to by the val parameter. This time information is the amount of time since the epoch. The epoch is referenced to
       00:00:00  GMT  (Greenwich Mean Time) 1 Jan 1970. The timespec structure, which is also defined in the sys/timers.h header file has the fol-
       lowing members:

       unsigned long	tv_sec	 Time of day since the epoch in seconds.
		long   tv_nsec	 Time  of  day	fraction  of  a   second
				 (expressed in nanoseconds).

NOTES

       Trial use

RETURN VALUES

       Upon  successful completion, the setclock() function returns a value of 0 (zero).  Otherwise, a value of -1 is returned and errno is set to
       indicate the error.

ERRORS

       If the setclock() function fails, errno may be set to one of the following values: The clktyp parameter does not specify  a  known  system-
       wide  clock, the information pointed to by the val parameter is outside the permissible range for the clock specified by the clktyp parame-
       ter, or a nanosecond value less than zero or greater than or equal to 1000 million is specified by the information pointed to  by  the  val
       parameter.  An error occurred while accessing the clock specified by the clktyp parameter.  The requesting process does not have the appro-
       priate privilege to set the clock specified by the clktyp parameter.

RELATED INFORMATION

       Functions: getclock(3), gettimer(3), time(3) delim off

																       setclock(3)