TIME man page on GhostBSD
[printable version]
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
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