linux-kernel - Re: [PATCH] proc: restore seekdir("/proc", 256) semantics

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Message-ID: <20180502191006.a4sizopciou2bfm5@devuan>
Date:   Wed, 2 May 2018 21:10:06 +0200
From:   Pavel Machek <pavel@....cz>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH] proc: restore seekdir("/proc", 256) semantics

Hi!

> Long time ago "/proc/self" was an honest symlink and all not-PID entries
> were output before /proc/$PID. To not lose /proc/self in readdir output
> after it became permanently positive dentry it was stuck before /proc/1.
> 
> One side effect of the change was that the code
> 
> 	d = opendir("/proc");
> 	seekdir(d, 256);
> 
> stopped pointing to the first PID for applications that want to skip all
> the crap.
> 
> Later "/proc/thread-self" was added in the same way.
> 
> It looks like ps and top aren't seeking over /proc but are simply
> skipping over so nobody noticed.
> 
> Restore old behaviour, make seekdir(254) point to /proc/self and
> seekdir(255) point to /proc/thread-self.

Is there anyone relying on the old behaviour?

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