Belkin F8E211 Guia do Utilizador descarregar pdf (Página 35)

alloc

urb()

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 );

Arguments:

link Speciﬁes multiple URBs linked together. (Not yet implemented.)

Library:

libusbdi

Description:

The usbd

alloc

urb() function allocates a USB Request Block (URB) to be used for

subsequent URB-based I/O transfers.

To free the block, use usbd

free

urb().

Returns:

A pointer to the start of the allocated block, or NULL if there isn’t enough memory.

Errors:

ENOMEM Insufﬁcient memory available.

Classiﬁcation:

QNX Neutrino, QNX 4

Safety

Cancellation point No

Interrupt handler No

Signal handler No

Thread Yes

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