rawhide report: 20041019 changes

[Ulrich Drepper]

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Jay Fenlason wrote:

> specifying O_NONBLOCK, then failing to handle EAGAIN reasonably is is
> an application bug.  Unfortunatly, it's a bug that hasn't actually
> been visible until now.

Well, there currently is no legal way to do this at all without busy
loops.  select/poll really have to return immediately for files
according to POSIX.  What would be needed is either to deliberately
diverge from POSIX or have a non-standard extension (like another epoll
flag) to do what is needed.

But it's good advise to look at every program using O_NONBLOCK on files.
 If it, as in squid's case, just reads a file and cannot proceed until
that happens and does not wait in poll/select/epoll while reading, then
there is absolutely no reason to use O_NONBLOCK and it should be removed.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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