debian man page for boottime

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

NAME
     boottime, time_second, time_uptime -- system time variables

SYNOPSIS
     #include <sys/time.h>

     extern struct timeval boottime;
     extern time_t time_second;
     extern time_t time_uptime;

DESCRIPTION
     The boottime variable holds the system boot time.

     The time_second variable is the system's ``wall time'' clock to the second.

     The time_uptime variable is the number of seconds since boot.

     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 elapse since boot more accurately and in an atomic manner.	The boottime variable may
     be read and written without special precautions.

SEE ALSO
     clock_settime(2), ntp_adjtime(2), settimeofday(2), bintime(9), binuptime(9), getbintime(9), getbinuptime(9), getmicrotime(9),
     getmicrouptime(9), getnanotime(9), getnanouptime(9), microtime(9), microuptime(9), nanotime(9), nanouptime(9)

     Poul-Henning Kamp, "Timecounters: Efficient and precise timekeeping in SMP kernels", Proceedings of EuroBSDCon 2002, Amsterdam,
     /usr/share/doc/papers/timecounter.ascii.gz.

     Marshall Kirk McKusick and George V. Neville-Neil, The Design and Implementation of the FreeBSD Operating System, Addison-Wesley,
     57-61,65-66, July 2004.

BSD
								September 17, 2004							       BSD