linux-kernel - Re: AIO operation and CMSG

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Date:   Wed, 17 Jan 2018 11:22:13 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Stephan Müller <smueller@...onox.de>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, netdev@...r.kernel.org
Subject: Re: AIO operation and CMSG

On Sun, Jan 14, 2018 at 09:01:00AM +0100, Stephan Müller wrote:
> The syscall io_submit sends data to the kernel and invokes the respective 
> handler function in the kernel such as the recvmsg handler. What I am 
> wondering is whether there is a way to send CMSG data along with the io_submit 
> syscall? If not, is CMSG handling with the AIO syscalls possible at all?

Not as-is, but it could be easily added by repurposing unused fields
in the iocb.  The big question is if it should be done to the existing
IOCB_CMD_PREADV/IOCB_CMD_PWRITEV types, or if new SENDMSG/RECVMSG ones
should be added instead.

Also you really want to Cc the relevant lists, I've only accidentally
seen this on linux-kernel.

> 
> Thank you very much.
> 
> [1] http://www.chronox.de/libkcapi.html
> 
> Ciao
> Stephan
> 
> 
---end quoted text---