Function clib_mem_vm_map_internal 

pub unsafe extern "C" fn clib_mem_vm_map_internal(
    base: *mut c_void,
    log2_page_sz: clib_mem_page_sz_t,
    size: uword,
    fd: c_int,
    log2_align: u8_,
    offset: uword,
    name: *mut c_char,
) -> *mut c_void