linux-kernel - AIO operation and CMSG

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Date:   Sun, 14 Jan 2018 09:01:00 +0100
From:   Stephan Müller <smueller@...onox.de>
To:     linux-kernel@...r.kernel.org
Subject: AIO operation and CMSG

Hi,

I am working on the user space library providing a wrapper to the AF_ALG user 
space interface [1]. The AF_ALG interface supports asynchronous operation 
which is utilized with the io_* system calls, including io_submit. All works 
as expected.

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?

Thank you very much.

[1] http://www.chronox.de/libkcapi.html

Ciao
Stephan