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NetBSD 6.1.5 - man page for inittodr (netbsd section 9)

INITTODR(9)			  BSD Kernel Developer's Manual 		      INITTODR(9)

NAME
     inittodr -- initialize system time

SYNOPSIS
     void
     inittodr(time_t base);

DESCRIPTION
     The inittodr() function determines the time and sets the system clock.  It tries to pick the
     correct time using a set of heuristics that examine the system's battery-backed clock and
     the time reported by the file system, as given in base.  Those heuristics include:

     o	 If the battery-backed clock has a valid time, and is not significantly behind the time
	 provided by base, it is used.

     o	 If the battery-backed clock does not have a valid time, or is significantly behind the
	 time provided in base, and the time provided in base is within reason, base is used as
	 the current time.

     o	 If the battery-backed clock appears invalid, and base appears non-sensical or was not
	 provided (was given as zero), an arbitrary base (typically some time within the same
	 year that the kernel was last updated) will be used.

     Once a system time has been determined, it is stored in the time variable.

DIAGNOSTICS
     The inittodr() function prints diagnostic messages if it has trouble figuring out the system
     time.  Conditions that can cause diagnostic messages to be printed include:

     o	 There is no battery-backed clock present on the system.

     o	 The battery-backed clock's time appears nonsensical.

     o	 The base time appears nonsensical.

     o	 The base time and the battery-backed clock's time differ by a large amount.

SEE ALSO
     clock_ymdhms_to_secs(9), resettodr(9), time_second(9)

BUGS
     Some systems use heuristics for picking the correct time that are slightly different.

BSD					September 6, 2006				      BSD


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