Проект OpenNet: MAN usb_pipe_get_max_bulk_transfer

Интерактивная система просмотра системных руководств (man-ов)

usb_pipe_get_max_bulk_transfer_size (9)

>> usb_pipe_get_max_bulk_transfer_size (9) ( Solaris man: Ядро )

NAME

usb_pipe_get_max_bulk_transfer_size - Get maximum
bulk transfer size

SYNOPSIS

#include <sys/usb/usba.h>



int usb_pipe_get_max_bulk_transfer_size(dev_info_t dip, size_t *size);

INTERFACE LEVEL

Solaris DDI specific (Solaris DDI)

PARAMETERS

dip

: Pointer to the device's dev_info structure.

size

: Returns the bulk transfer size.

DESCRIPTION

The usb_pipe_get_max_bulk_transfer_size() function returns the maximum data transfer size in bytes that the host controller driver can support per bulk request. This information can be used to limit or break down larger requests to manageable sizes.

RETURN VALUES

USB_SUCCESS

: Size is returned in size argument.

USB_INVALID_ARGS

: dip and/or size argument is NULL.

USB_FAILURE

: Size could not be returned. Zero is returned in size arg.

CONTEXT

May be called from user, kernel or interrupt context.

EXAMPLES

    int xxx_attach(dev_info_t *dip, int command)
   {
          ...
          usb_pipe_get_max_bulk_transfer_size(dip, &state>max_xfer_size);
          ...
   }

   void xxx_minphys(struct buf bp)
   {
          ...
          if (bp->b_bcount > state->max_xfer_size) {
                  bp->b_bcount = state->max_xfer_size;
          }
          ...
   }