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

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Message-ID: <20100424015334.GO14986@thunk.org>
Date:	Fri, 23 Apr 2010 21:53:34 -0400
From:	tytso@....edu
To:	Pavel Machek <pavel@....cz>
Cc:	Arve Hj??nnev??g <arve@...roid.com>,
	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

On Fri, Apr 23, 2010 at 10:43:49AM +0200, Pavel Machek wrote:
> > +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.

Yep, and there's nothing wrong with that IMHO.  It's a clever use of
the _IOC encoding scheme.

						- Ted
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