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.

usb_get_current_frame_number(9f)

usb_get_cur...rame_number(9F)  Kernel Functions  usb_get_cur...rame_number(9F)

NAME
       usb_get_current_frame_number - Return current logical usb frame number

SYNOPSIS
       #include <sys/usb/usba.h>

       usb_frame_number_t usb_get_current_frame_number(dev_info_t *dip);

INTERFACE LEVEL
       Solaris DDI specific (Solaris DDI)

PARAMETERS
       dip    Pointer to the device's dev_info structure.


DESCRIPTION
       The usb_get_current_frame_number() function retrieves the current logi‐
       cal USB frame number.


       Isochronous  requests can be started on a particular numbered frame. An
       offset number of frames (typically between 4 and 10) can  be  added  to
       the  current  logical frame number to specify the number of an upcoming
       frame to start an isochronous request.


       The USB specification requires that the frame frequency (the period be‐
       tween start-of-frame packets) is one millisecond. The Solaris operating
       system USB implementation uses a running counter of the number of  mil‐
       liseconds since boot as the current logical frame number.

RETURN VALUES
       On  success,  the  usb_get_current_frame_number()  function returns the
       current USB frame number. On failure it returns 0. The  function  fails
       if dip is NULL.

CONTEXT
       May be called from user, kernel or interrupt context.

EXAMPLES
             usb_pipe_handle_t handle;
             usb_frame_number_t offset = 10;
             usb_isoc_req_t *isoc_req;

             isoc_req = usb_alloc_isoc_req(...);
               ...
               ...
             isoc_req->isoc_frame_no = usb_get_current_frame_number(dip) + offset;
             isoc_req->isoc_attributes = USB_ATTRS_ISOC_START_FRAME;
               ...
               ...
             if (usb_pipe_isoc_xfer(handle, isoc_req, 0) != USB_SUCCESS) {
               ...
             }


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ ArchitecturePCI-based systems  _  Interface  Stability‐
       Committed _ Availabilitysystem/io/usb


SEE ALSO
       attributes(7),   usb_alloc_isoc_req(9F),  usb_get_max_pkts_per_isoc_re‐
       quest(9F),                     usb_pipe_get_max_bulk_transfer_size(9F),
       usb_pipe_isoc_xfer(9F), usb_isoc_request(9S)

Oracle Solaris 11.4               11 Dec 2020    usb_get_cur...rame_number(9F)