_IO_ALLOCATION_ACTION

headersMetadatacopy
enum _IO_ALLOCATION_ACTION {
    KeepObject = 1,/* 0x1 */
    DeallocateObject = 2,/* 0x2 */
    DeallocateObjectKeepRegisters = 3,/* 0x3 */
};
/* computed from the NT 4.0 DDK headers */