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$FreeBSD: releng/10.3/share/man/man9/microuptime.9 253660 2013-07-25 20:53:15Z brooks $
.Dd July 25, 2013 .Dt MICROUPTIME 9 .Os .Sh NAME .Nm binuptime , .Nm getbinuptime , .Nm microuptime , .Nm getmicrouptime , .Nm nanouptime , .Nm getnanouptime , .Nm sbinuptime , .Nm getsbinuptime .Nd get the time elapsed since boot .Sh SYNOPSIS n sys/time.h .Ft void .Fn binuptime "struct bintime *bt" .Ft void .Fn getbinuptime "struct bintime *bt" .Ft void .Fn microuptime "struct timeval *tv" .Ft void .Fn getmicrouptime "struct timeval *tv" .Ft void .Fn nanouptime "struct timespec *ts" .Ft void .Fn getnanouptime "struct timespec *tsp" .Ft sbintime_t .Fn sbinuptime "void" .Ft sbintime_t .Fn getsbinuptime "void" .Sh DESCRIPTION The .Fn binuptime and .Fn getbinuptime functions store the time elapsed since boot as a .Vt "struct bintime" at the address specified by .Fa bt . The .Fn microuptime and .Fn getmicrouptime functions perform the same utility, but record the elapsed time as a .Vt "struct timeval" instead. Similarly the .Fn nanouptime and .Fn getnanouptime functions store the elapsed time as a .Vt "struct timespec" . The .Fn sbinuptime and .Fn getsbinuptime functions return the time elapsed since boot as a .Vt "sbintime_t" .
p The .Fn binuptime , .Fn microuptime , .Fn nanouptime , and .Fn sbinuptime functions always query the timecounter to return the current time as precisely as possible. Whereas .Fn getbinuptime , .Fn getmicrouptime , .Fn getnanouptime , and .Fn getsbinuptime functions are abstractions which return a less precise, but faster to obtain, time.
p The intent of the .Fn getbinuptime , .Fn getmicrouptime , .Fn getnanouptime , and .Fn getsbinuptime functions is to enforce the user's preference for timer accuracy versus execution time. .Sh SEE ALSO .Xr bintime 9 , .Xr getbintime 9 , .Xr getmicrotime 9 , .Xr getnanotime 9 , .Xr microtime 9 , .Xr nanotime 9 , .Xr tvtohz 9 .Sh AUTHORS This manual page was written by .An Kelly Yancey Aq kbyanc@posi.net .