From: Jens Axboe <[email protected]>
To: Norman Maurer <[email protected]>, [email protected]
Cc: Josef <[email protected]>
Subject: Re: IORING_OP_READ and O_NONBLOCK behaviour
Date: Wed, 2 Sep 2020 08:45:34 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 9/2/20 4:09 AM, Norman Maurer wrote:
> Hi there,
>
> We are currently working on integrating io_uring into netty and found
> some “suprising” behaviour which seems like a bug to me.
>
> When a socket is marked as non blocking (accepted with O_NONBLOCK flag
> set) and there is no data to be read IORING_OP_READ should complete
> directly with EAGAIN or EWOULDBLOCK. This is not the case and it
> basically blocks forever until there is some data to read. Is this
> expected ?
>
> This seems to be somehow related to a bug that was fixed for
> IO_URING_ACCEPT with non blocking sockets:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.8&id=e697deed834de15d2322d0619d51893022c90ea2
I agree with you that this is a bug, in general it's useful (and
expected) that we'd return -EAGAIN for that case. I'll take a look.
--
Jens Axboe
next prev parent reply other threads:[~2020-09-02 14:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 10:09 IORING_OP_READ and O_NONBLOCK behaviour Norman Maurer
2020-09-02 14:45 ` Jens Axboe [this message]
2020-09-02 15:26 ` Pavel Begunkov
2020-09-02 15:35 ` Jens Axboe
2020-09-02 16:00 ` Pavel Begunkov
2020-09-02 16:02 ` Pavel Begunkov
2020-09-02 16:05 ` Jens Axboe
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