microuptime(9)
NAME
- binuptime, getbinuptime, microuptime, getmicrouptime,
- nanouptime,
getnanouptime - get the time elapsed since boot
SYNOPSIS
#include <sys/time.h>
void
binuptime(struct bintime *bt);
void
getbinuptime(struct bintime *bt);
void
microuptime(struct timeval *tv);
void
getmicrouptime(struct timeval *tv);
void
nanouptime(struct timespec *ts);
void
getnanouptime(struct timespec *tsp);
DESCRIPTION
- The binuptime() and getbinuptime() functions store the time
- elapsed since
boot as a struct bintime at the address specified by bt.
- The
microuptime() and getmicrouptime() functions perform the
- same utility,
but record the elapsed time as a struct timeval instead.
- Similarly the
nanouptime() and getnanouptime() functions store the elapsed
- time as a
struct timespec.
- The binuptime(), microuptime(), and nanouptime() functions
- always query
the timecounter to return the current time as precisely as
- possible.
Whereas getbinuptime(), getmicrouptime(), and
- getnanouptime() functions
are abstractions which return a less precise, but faster to
- obtain, time.
- The intent of the getbinuptime(), getmicrouptime(), and
- getnanouptime()
functions is to enforce the user's preference for timer ac
- curacy versus
execution time.
SEE ALSO
- bintime(9), getbintime(9), getmicrotime(9), getnanotime(9),
- microtime(9),
nanotime(9), tvtohz(9)
AUTHORS
- This manual page was written by Kelly Yancey
- <kbyanc@posi.net>.
- BSD September 16, 2004