DDK_Ashmem

typedef struct DDK_Ashmem {...} DDK_Ashmem

Overview

Device memory map created by calling OH_DDK_CreateAshmem. A buffer using the device memory map can provide better performance.

Since: 12

Related module: Ddk

Header file: ddk_types.h

Name	Description
int32_t ashmemFd	File descriptor of the Ashmem object.
const uint8_t* address	Buffer address.
const uint32_t size	Buffer size.
uint32_t offset	Offset of the used buffer. The default value is 0, indicating that there is no offset and the buffer starts from the specified address.
uint32_t bufferLength	Length of the buffer. By default, the value is equal to that of size, indicating that the entire buffer is used.
uint32_t transferredLength	Length of the transferred data.