boottime man page on DragonFly
[printable version]
TIME(9) BSD Kernel Developer's Manual TIME(9)
NAME
boottime, time_second — system time variables
SYNOPSIS
#include <sys/time.h>
extern struct timeval boottime;
extern time_t time_second;
DESCRIPTION
The boottime variable holds the system boot time. The time_second vari‐
able is the system's “wall time” clock to the second.
The microtime(9), getmicrotime(9), nanotime(9), and getnanotime(9) func‐
tions can be used to get the current time in an atomic manner. Simi‐
larly, the microuptime(9), getmicrouptime(9), nanouptime(9), and
getnanouptime(9) functions can be used to get the time elapsed since boot
in an atomic manner. The boottime variable may be read and written with‐
out special precautions.
SEE ALSO
clock_settime(2), ntp_adjtime(2), settimeofday(2), inittodr(9),
microtime(9), microuptime(9)
BSD April 9, 2008 BSD
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