Function try_decode_usize

src/backend/linux_raw/io/errno.rs:132–140

(raw: RetReg<Num>)

/// success.
#[inline]
pub(in crate::backend) fn try_decode_usize<Num: RetNumber>(raw: RetReg<Num>) -> io::Result<usize> {
    if raw.is_in_range(-4095..0) {
        // SAFETY: `raw` must be in `-4095..0`, and we just checked that raw is
        // in that range.
        return Err(unsafe { Errno(raw.decode_error_code()) });
    }

    Ok(raw.decode_usize())
}

/// Check for an error from the result of a syscall which encodes a
/// `*mut c_void` on success.