Belkin F8E211 Guía de usuario descargar pdf (Pagina 38)

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

Allocate a USB Request Block for subsequent URB-based operations

Synopsis:

#include <sys/usbdi.h>

struct usbd

urb *usbd alloc urb( struct usbd urb *link );

Description:

The usbd alloc urb() function allocates a USB Request Block (URB)

to be used for subsequent URB-based I/O transfers.

link Speciﬁes multiple URBs linked together. (Not yet

implemented.)

To free the block, use usbd

free urb().

Returns:

A pointer to the start of the allocated block, or NULL if there’s not

enough memory.

Errors:

ENOMEM Insufﬁcient memory available.

Classiﬁcation:

QNX Neutrino, QNX 4

Safety

Cancellation point No

Interrupt handler No

Signal handler No

Thread Yes

26 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 38