linux-kernel - Re: [PATCH 2/9] PM: suspend_block: Add driver to access suspend blockers from user-space

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Date:	Fri, 23 Apr 2010 10:43:49 +0200
From:	Pavel Machek <pavel@....cz>
To:	Arve Hj??nnev??g <arve@...roid.com>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Magnus Damm <damm@...l.co.jp>,
	Nigel Cunningham <nigel@...onice.net>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/9] PM: suspend_block: Add driver to access suspend
 blockers from user-space

Hi!

> Add a misc device, "suspend_blocker", that allows user-space processes
> to block auto suspend. The device has ioctls to create a suspend_blocker,
> and to block and unblock suspend. To delete the suspend_blocker, close
> the device.
> 
> Signed-off-by: Arve Hj??nnev??g <arve@...roid.com>

> --- a/Documentation/power/suspend-blockers.txt
> +++ b/Documentation/power/suspend-blockers.txt
> @@ -95,3 +95,20 @@ if (list_empty(&state->pending_work))
>  else
>  	suspend_block(&state->suspend_blocker);
>  
> +User-space API
> +==============
> +
> +To create a suspend_blocker from user-space, open the suspend_blocker device:
> +    fd = open("/dev/suspend_blocker", O_RDWR | O_CLOEXEC);
> +then call:
> +    ioctl(fd, SUSPEND_BLOCKER_IOCTL_INIT(strlen(name)), name);


This seems like very wrong idea -- it uses different ioctl number for
each length AFAICT.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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