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usbd_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

See also:

usbd_alloc(), usbd_free(), usbd_free_urb(), usbd_mphys()

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