Re: eventfd: socket does not allow changing to non-blocking

[Jason Thorpe <thorpej%me.com@localhost>]

> On Feb 16, 2022, at 1:51 AM, Thomas Klausner <wiz%NetBSD.org@localhost> wrote:
> 
> Hi!
> 
> NetBSD recently got an eventfd interface which is supposedly
> compatible to Linux's.
> 
> net/zeromq uses eventfds and has lots of assertions in its test code,
> and I looked at one of them. It basically makes a new eventfd and then
> tries to set it to non-blocking mode using fcntl. This fails with
> 'operation not supported'.
> 
> I see that eventfd() is documented as having a flag for non-blocking
> mode when creating the eventfd, but since zeromq is doing this using
> fnctl(), I guess this is supposed to work that way as well.
> 
> Is this a bug in NetBSD's eventfd implementation or is zeromq wrong
> here?

Just a bug, I guess.  Will you file a PR?

-- thorpej