Belkin F8E211 Guía de usuario descargar pdf (Pagina 110)

usbd urb status()  2006, QNX Software Systems GmbH & Co. KG.

Return status information on a URB

Synopsis:

#include <sys/usbdi.h>

int usbd

urb status( struct usbd urb *urb,

uint32 *status,

uint32 *len )

Description:

You use the usbd urb status() function to extract completion status

and data-transfer length from a URB.

urb An opaque handle (from usbd

alloc urb()).

status Completion status (see below).

len The actual length (in bytes) of the data transfer.

Completion status

The status ﬁeld contains the completion status information, which

includes the following ﬂags:

USBD STATUS INPROG

The operation is in progress.

USBD STATUS CMP

The operation is complete.

USBD STATUS CMP ERR

The operation is complete, but an error occurred.

USBD STATUS TIMEOUT

The operation timed out.

USBD STATUS ABORTED

The operation aborted.

98 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 110