Function safe_app::ffi::nfs::file_open

#[no_mangle]
pub unsafe extern "C" fn file_open(
    app: *const App, 
    parent_info: *const MDataInfo, 
    file: *const File, 
    open_mode: u64, 
    user_data: *mut c_void, 
    o_cb: extern "C" fn(user_data: *mut c_void, result: *const FfiResult, file_h: FileContextHandle)
)

Open the file to read or write its contents.