Hi Merijn,
I see how you'd wait for exceptional conditions using select(). Epoll is a
bit different... How would you do it with epoll? Is it using the EPOLLPRI
event type?
Andi
On Sun, Mar 16, 2014 at 1:16 PM, Merijn Verstraaten
I just went with the common documentation name, I know this includes out-of-band data, etc. If it makes you happier, feel free to consider this proposal with s/Error/Exceptional, regardless of how it's called, it'd be nice if we could use this from within Haskell.
Cheers, Merijn
On Mar 16, 2014, at 16:09 , Brandon Allbery wrote:
On Sun, Mar 16, 2014 at 10:25 AM, Merijn Verstraaten < merijn@inconsistent.nl> wrote:
threadWaitError :: Fd -> IO () threadWaitErrorSTM :: Fd -> IO (STM (), IO ())
to allow for blocking on detecting error condition on file descriptors, similar to what C's select() allows.
If you mean the third bitmask, it is not for errors (notwithstanding the documentation on some systems); an "exceptional condition" is not an error, it's MSG_OOB data. Errors show as "ready" on the appropriate mask (read or write) since a read (resp. write) will return immediately with the error instead of blocking.
See http://stackoverflow.com/questions/1342712/nix-select-and-exceptfds-errorfds... http://man7.org/linux/man-pages/man2/select_tut.2.html for more information.
-- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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