Clock doesn't tick Post: 302653185

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Hey all, i need a program to get the CPU ticks at certain points of my program. So, i thought about using the clock function, but i'm having a hard time figuring out how it really works. I wrote this simple program to try to understand it but it made me feel more confused: #include <stdio.h>...

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LEARN ABOUT NETBSD

inittodr

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 mes-
     sages 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

9 More Discussions You Might Find Interesting

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Clock Trouble

Discussion started by: LolapaloL

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clock() function

Discussion started by: kastrup_carioca

3. UNIX for Advanced & Expert Users

clock change

Discussion started by: markab2