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Subject: Re: [PATCH 2/8] PM: suspend_block: Add driver to access suspend
 blockers from user-space
From: Peter Zijlstra <peterz@infradead.org>
To: Arve =?ISO-8859-1?Q?Hj=F8nnev=E5g?= <arve@android.com>
Cc: linux-pm@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
       "Rafael J. Wysocki" <rjw@sisk.pl>, Randy Dunlap <rdunlap@xenotime.net>,
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Date: Wed, 26 May 2010 10:43:48 +0200
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On Fri, 2010-05-21 at 15:46 -0700, Arve Hjønnevåg wrote:
> +To create a suspend blocker from user space, open the suspend_blocker
> special
> +device file:
> +
> +    fd = open("/dev/suspend_blocker", O_RDWR | O_CLOEXEC);
> +
> +then optionally call:
> +
> +    ioctl(fd, SUSPEND_BLOCKER_IOCTL_SET_NAME(strlen(name)), name);
> +
> +To activate the suspend blocker call:
> +
> +    ioctl(fd, SUSPEND_BLOCKER_IOCTL_BLOCK);
> +
> +To deactivate it call:
> +
> +    ioctl(fd, SUSPEND_BLOCKER_IOCTL_UNBLOCK);
> +
> +To destroy the suspend blocker, close the device:
> +
> +    close(fd);

Urgh, please let the open() be BLOCK, the close() be UNBLOCK, and keep
the SET_NAME thing if you really care.