usbd_alloc()

Allocate a memory area to use for data transfers

Synopsis:

#include <sys/usbdi.h>

void *usbd_alloc( size_t size );

Arguments:

size

The size, in bytes, of the area to allocate.

Library:

libusbdi

Description:

The usbd_alloc() function allocates a memory area that can then be used for data transfers. You should use the memory area allocated by this function, because it's allocated efficiently and because its physical address is quickly obtained via usbd_mphys().

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The usbd_setup_*() functions require usbd_alloc()'d data buffers.

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To free the memory, use usbd_free().

Returns:

A pointer to the start of the allocated memory, or NULL if there's not enough memory.

Errors:

ENOMEM

Insufficient memory available.

Classification:

QNX Neutrino, QNX 4

See also:

usbd_alloc_urb(), usbd_free(), usbd_free_urb(), usbd_mphys()