INITTODR(9) BSD Kernel Developer's Manual INITTODR(9)NAME
inittodr -- initialize system time
SYNOPSIS
#include <sys/types.h>
#include <sys/systm.h>
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 obtained from the root file system, as given in base. How the base value is obtained
will vary depending on the root file system type. The heuristics used include:
o If the battery-backed clock has a valid time, it is used.
o If the battery-backed clock does not have a valid time, the time provided in base 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 The battery-backed clock's time appears nonsensical.
SEE ALSO resettodr(9), time(9)BUGS
On many systems, inittodr() has to convert from a time expressed in terms of year, month, day, hours, minutes, and seconds to time, expressed
in seconds. Many of the implementations could share code, but do not.
Each system's heuristics for picking the correct time are slightly different.
The FreeBSD implementation should do a better job of validating the time provided in base when the battery-backed clock is unusable. Cur-
rently it unconditionally sets the system clock to this value.
BSD March 22, 1997 BSD
Check Out this Related Man Page
TIME_SECOND(9) BSD Kernel Developer's Manual TIME_SECOND(9)NAME
time_second, time_uptime, boottime -- system time variables
SYNOPSIS
#include <sys/time.h>
extern time_t time_second;
extern time_t time_uptime;
#include <sys/kernel.h>
extern struct timeval boottime;
DESCRIPTION
The time_second variable is the system's ``wall time'' clock. It is set at boot by inittodr(9), and is updated periodically via
timecounter(9) framework, and also updated by the settimeofday(2) system call.
The time_uptime variable is a monotonically increasing system clock. It is set at boot, and is updated periodically. (It is not updated by
settimeofday(2).)
The boottime variable holds the system boot time. It is set at system boot, and is updated when the system time is adjusted with
settimeofday(2). The variable may be read and written without special precautions.
All of these variables contain times expressed in seconds and microseconds since midnight (0 hour), January 1, 1970.
The bintime(9), getbintime(9), microtime(9), getmicrotime(9), nanotime(9), and getnanotime(9) functions can be used to get the current time
more accurately and in an atomic manner.
Similarly, the binuptime(9), getbinuptime(9), microuptime(9), getmicrouptime(9), nanouptime(9), and getnanouptime(9) functions can be used to
get the time elapsed since boot more accurately and in an atomic manner.
SEE ALSO clock_settime(2), ntp_adjtime(2), timeval(3), hardclock(9), hz(9)BSD March 13, 2008 BSD
Hi Guys,
Hopefully someone would be able to help me out. Basically I have an HPUX 11.11i system which is backed up by Data Protector 4.5. Every so often the vdba process hangs and chews up 100% of one of the systems CPU resources. As our monitoring tool can only monitor on a per system basis... (3 Replies)
Hi all ,
I need to make a program who describes this ( upper ) graphic:
http://upload.wikimedia.org/wikipedia/commons/8/82/Sawtooth-td_and_fd.png
My idea is to implement a battery charge
x: 0 to time T,
y : 0 to 1 values.
Can you help me ? (1 Reply)
Hi all,
how to get the same time in two systems,
for example:
in one system i have the correct time, and second system i have wrong time.
now i want the first sytem to second sytem, i dont to want to do this work manually.
i know there is one command to get the time. in ntp.
... (3 Replies)
This is a strange one, I've never seen anything like it; the realtime clock doesn't tick while the computer's idle, only when you're watching it. Leave for 3 hours and it'll be 3 hours off. It still advances when it's off however, or the time would be far more incorrect than it is.
About all... (10 Replies)