개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

drv_hztousec(9f)

drv_hztousec(9F)               Kernel Functions               drv_hztousec(9F)



NAME
       drv_hztousec - convert clock ticks to microseconds

SYNOPSIS
       #include <sys/types.h>
       #include <sys/ddi.h>

       clock_t drv_hztousec(clock_t hertz);

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI).

PARAMETERS
       hertz    The number of clock ticks to convert.


DESCRIPTION
       The   drv_hztousec()  function  converts  into  microseconds  the  time
       expressed by hertz, which is in system clock ticks.


       The length of time the system has been up since boot can  be  retrieved
       by calling ddi_get_lbolt(9F), which will return a value of type clock_t
       containing the number of clock ticks since boot. Drivers often use  the
       value of lbolt before and after an I/O request to measure the amount of
       time it took the device to  process  the  request.  The  drv_hztousec()
       function  can  be  used by the driver to convert the reading from clock
       ticks to a known unit of time.

RETURN VALUES
       The number of microseconds equivalent to the hertz parameter. No  error
       value  is returned. If the microsecond equivalent to hertz is too large
       to be represented as a clock_t, then the maximum clock_t value will  be
       returned.

CONTEXT
       The drv_hztousec() function can be called from user, interrupt, or ker‐
       nel context.

SEE ALSO
       ddi_get_lbolt(9F), drv_usectohz(9F), drv_usecwait(9F)


       Writing Device Drivers in Oracle Solaris 11.4



Oracle Solaris 11.4               4 Sep 2009                  drv_hztousec(9F)