Messages in this thread | | | Date | Tue, 20 Mar 2001 22:37:56 +0000 (GMT) | From | David Woodhouse <> | Subject | Re: esound (esd), 2.4.[12] chopped up sound -- solved |
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On Tue, 20 Mar 2001, Doug Ledford wrote:
> Why would esd get a short write() unless it is opening the file in non > blocking mode (which I didn't see when I was working on the i810 sound > driver)? If esd is writing to a file in blocking mode and that write is > returning short, then that sounds like a driver bug to me.
Please quote chapter and verse.
I'm looking at http://www.opengroup.org/onlinepubs/7908799/xsh/write.html and cannot see anything which states that write may not return having written fewer data than it was asked to.
The only vaguely relevant text I see is...
Write requests to a pipe or FIFO will be handled the same as a regular file with the following exceptions:
<...>
* If the O_NONBLOCK flag is clear, a write request may cause the thread to block, but on normal completion it will return nbyte.
This being an _exception_ clearly implies that for file descriptors other than pipes and fifos, it is _not_ necessary to return nbyte on normal completion.
Applications (and also I believe glibc) which assume otherwise are, technically, broken. Despite being numerous.
-- dwmw2
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