Function readinto

crates/vm/src/stdlib/os.rs:304–321

(
        fd: crt_fd::Borrowed<'_>,
        buffer: ArgMemoryBuffer,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn readinto(
        fd: crt_fd::Borrowed<'_>,
        buffer: ArgMemoryBuffer,
        vm: &VirtualMachine,
    ) -> PyResult<usize> {
        buffer.with_ref(|buf| {
            loop {
                match vm.allow_threads(|| crt_fd::read(fd, buf)) {
                    Ok(n) => return Ok(n),
                    Err(e) if e.raw_os_error() == Some(libc::EINTR) => {
                        vm.check_signals()?;
                        continue;
                    }
                    Err(e) => return Err(e.into_pyexception(vm)),
                }
            }
        })
    }

    #[pyfunction]
    fn write(fd: crt_fd::Borrowed<'_>, data: ArgBytesLike, vm: &VirtualMachine) -> PyResult<usize> {