Re: [Libevent-users] About the parameter of callback

[Nick Mathewson <nickm@xxxxxxxxxxxxx>]

On Fri, Jan 28, 2011 at 11:26 PM, ZHOU Xiaobo <xb.zhou@xxxxxx> wrote:
> I mean the error 'epoll'(or sth else) detected.
> for example, if a socket is closed by its peer, and the corresponding callback is invoked, how can the callback know
> that there is and error happened? try to read/write the socket first?

Yes; that's reported as a read event, so you get an error when you
read.  It's not the neatest interface in the universe, but most of the
OS-provided event backends don't give you a lot of granularity in how
they report errors, so Libevent needs to provide the common subset of
their interfaces.

yrs,
-- 
Nick
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