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Date: Tue, 20 Nov 2007 17:41:35 -0700 From: ebiederm@...ssion.com (Eric W. Biederman) To: Ulrich Drepper <drepper@...hat.com> Cc: Roland McGrath <roland@...hat.com>, Guillaume Chazarain <guichaz@...oo.fr>, Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>, "Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>, kernel list <linux-kernel@...r.kernel.org>, netdev <netdev@...r.kernel.org> Subject: Re: 2.6.24-rc3: find complains about /proc/net Ulrich Drepper <drepper@...hat.com> writes: > Roland McGrath wrote: >> Oh, it seems it has indeed been that way for a very long time, so I was >> mistaken. It still seems a little odd to me. Ulrich can say definitively >> whether the kind of concern I mentioned really matters one way or the other >> for glibc. > > glibc cannot survive (at least NPTL) if somebody uses funny CLONE_* > flags to separate various pieces of information, e.g., file descriptors. > So, all the information in each thread's /proc/self should be identical. Which seems to confirm that glibc and native pthread can't care. > When the information is not the same, the current semantics seems to be > more useful. So I guess, no change is the way to go here. Could you elaborate a bit on how the semantics of returning the wrong information are more useful? In particular if a thread does the logical equivalent of: grep Pid: /proc/self/status. It always get the tgid despite having a different process id. How can that possibly be useful or correct? >From the kernel side I really think the current semantics of /proc/self in the context of threads is a bug and confusing. All of the kernel developers first reaction when this was pointed out was that this is a regression. If it is truly useful to user space we can preserve this API design bug forever. I just want to make certain we are not being bug compatible without a good reason. Currently we have several kernel side bugs with threaded programs because /proc/self does not do the intuitive thing. Unless something has changed recently selinux will cause accesses by a non-leader thread to fail when accessing files through /proc/self. So far the more I look at the current /proc/self behavior the more I am convinced it is broken, and useless. Please help me see where it is useful, so we can justify keeping it. Thanks, Eric - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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