linux-kernel - Re: [PATCH 14/36] aio: implement IOCB_CMD

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Message-ID: <x49mv13ys9u.fsf@segfault.boston.devel.redhat.com>
Date:   Wed, 24 Jan 2018 14:24:13 -0500
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     viro@...iv.linux.org.uk, Avi Kivity <avi@...lladb.com>,
        linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        netdev@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/36] aio: implement IOCB_CMD_POLL

Christoph Hellwig <hch@....de> writes:

> Simple one-shot poll through the io_submit() interface.  To poll for
> a file descriptor the application should submit an iocb of type
> IOCB_CMD_POLL.  It will poll the fd for the events specified in the
> the first 32 bits of the aio_buf field of the iocb.
>
> Unlike poll or epoll without EPOLLONESHOT this interface always works
> in one shot mode, that is once the iocb is completed, it will have to be
> resubmitted.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

Acked-by: Jeff Moyer <jmoyer@...hat.com>