linux-kernel - Re: Best method for sending messages to user space?

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Message-ID: <e9c3a7c20810211114w5be330d3h35f859b4ea8f8af7@mail.gmail.com>
Date:	Tue, 21 Oct 2008 11:14:04 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Timur Tabi" <timur@...escale.com>
Cc:	linux-kernel@...r.kernel.org,
	"Kumar Gala" <kumar.gala@...escale.com>
Subject: Re: Best method for sending messages to user space?

On Tue, Oct 21, 2008 at 10:54 AM, Timur Tabi <timur@...escale.com> wrote:
> I have a driver that provides services for a hypervisor that my company is
> creating.  The hypervisor can send notifications to the driver via interrupts.
> I want to send a message to user space whenever the driver receives one of the
> interrupts.  The messages don't have any payload.
>
> Should I be creating kobjects and using kobject_uevent(..., KOBJ_CHANGE) to send
> these messages?  I want to take advantage of the standard (hotplug?) user-space
> interface for this sort of thing, so that I don't need to have a custom-written
> daemon running that waits on blocking ioctl calls.
>

I really like the sysfs_notify() approach that Neil Brown has put
together for delivering md-raid events.  Now with 2.6.28 you will be
able do this from an atomic context with sysfs_notify_dirent() [1].

--
Dan

[1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=f1282c84
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