David Holland writes:
> Basically, it is not feasible to check for and report all possible
> errors ahead of time, nor in general is it possible or even desirable
> to unwind portions of a write that have already been completed, which
> means that if a failure occurs partway through a write
> It is possible for write() calls to fail partway through, after
> already having written some data.
It is. As you note later, it's also possible for read().
The rightest thing to do, it seems to me, would be to return the error
indication along with how much was successfully written (or
(This came up in chat, and since there was no agreement at all there
it seems it ought to be discussed here.)
It is possible for write() calls to fail partway through, after
already having written some data. We do not currently document the
behavior under these circumstances (though we should),
