freebsd man page for getnanouptime

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

NAME
     binuptime, getbinuptime, microuptime, getmicrouptime, nanouptime, getnanouptime, sbinuptime, getsbinuptime -- 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);

     sbintime_t
     sbinuptime(void);

     sbintime_t
     getsbinuptime(void);

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 sbinuptime() and getsbinuptime() functions
     return the time elapsed since boot as a sbintime_t.

     The binuptime(), microuptime(), nanouptime(), and sbinuptime() functions always query the timecounter to return the current time as precisely
     as possible.  Whereas getbinuptime(), getmicrouptime(), getnanouptime(), and getsbinuptime() functions are abstractions which return a less
     precise, but faster to obtain, time.

     The intent of the getbinuptime(), getmicrouptime(), getnanouptime(), and getsbinuptime() functions is to enforce the user's preference for
     timer accuracy 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
								   July 25, 2013							       BSD