[Libevent-users] files and libevent

[Nick Mathewson]

On Thu, Jun 12, 2008 at 07:59:45AM -0700, Teunis Peters wrote:
> I've not found any code to work with - but is there any reason that 
> libevent would not work with standard files?
> 
> I keep getting permission denied
> 
> more or less:
> 
> fd = open(filename, O_RDONLY)
> event_set(&ev, EV_READ | EV_PERSIST, rd_callback, rd_data);
> event_add(&ev, NULL)
> -> EPERM
> 
> Or does libevent only work with network connections?

Libevent uses underlying nonblocking IO mechanisms the platform gives
it.  Some of these work well with non-socket file descriptors; some
don't.  By default, libevent uses the fastest (best-scaling) backend
that it knows about for your platform, even if that backend doesn't
support all fds.

In the current svn trunk (which will eventually become libevent 2.0),
there's a feature to let you specify that you want a backend that
works with file descriptors, even if it doesn't scale well.

yrs,
-- 
Nick