On 14/11/2019 00:27, Pavel Begunkov wrote:
> If an operation doesn't need a file, set fd to an invalid value.
> This would help to spot an unwanted fdget() in the kernel, and is
> conceptually more correct (though negotiable)
> 

Either we can add a test with close(0) beforehand, but it
won't much help with new opcodes in the future. 

-- 
Pavel Begunkov