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

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

     time_second, time_uptime, boottime -- system time variables

     #include <sys/time.h>

     extern time_t time_second;
     extern time_t time_uptime;

     #include <sys/kernel.h>

     extern struct timeval boottime;

     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.

     clock_settime(2), ntp_adjtime(2), timeval(3), hardclock(9), hz(9)

BSD					  March 13, 2008				      BSD

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