VkImportMemoryFdInfoKHR

To import memory from a POSIX file descriptor handle, add a VkImportMemoryFdInfoKHR structure to the pNext chain of the VkMemoryAllocateInfo structure. The VkImportMemoryFdInfoKHR structure is defined as:

typedef struct VkImportMemoryFdInfoKHR {
    VkStructureType sType;
    const void* pNext;
    VkExternalMemoryHandleTypeFlagBits handleType;
    int fd;
} VkImportMemoryFdInfoKHR;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• handleType is a VkExternalMemoryHandleTypeFlagBits value specifying the handle type of fd.
• fd is the external handle to import.

Importing memory from a file descriptor transfers ownership of the file descriptor from the application to the Vulkan implementation. The application must not perform any operations on the file descriptor after a successful import. The imported memory object holds a reference to its payload.

Applications can import the same payload into multiple instances of Vulkan, into the same instance from which it was exported, and multiple times into a given Vulkan instance. In all cases, each import operation must create a distinct VkDeviceMemory object.