Messages in this thread | | | From | (bill davidsen) | Subject | Re: Who changed /proc/<pid>/ in 2.6.0-test5-bk9? | Date | 1 Oct 2003 20:58:39 GMT |
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In article <Pine.LNX.4.44.0310010803530.23860-100000@home.osdl.org>, Linus Torvalds <torvalds@osdl.org> wrote: | | On Wed, 1 Oct 2003, Mikael Pettersson wrote: | > | > Linus' 2.6.0-test6 announcement doesn't seem to mention the | > fact that 2.6.0-test5-bk9 fundamentally changed the semantics | > of /proc/self and the /proc/<pid> name space. | | Well, that's because the semantics weren't _supposed_ to change. The new | semantics were meant to be a superset of the old behaviour, with just the | added "task" subdirectory that lists the actual threads. | | However, you're right that "/proc/self" should likely point into the | _thread_, and not into the task. But it's debatable. You are very likely | the only one who could ever care ;)
Well, it's a subtle detail, and it would be well to document such. He may be the only person to use that, but it's certainly not intuitive, and if I were to ever do this I'm certainly alerted that it might violate Plauger's law of least astonishment. I would hope it points to the thread, but if it doesn't it's not something I use every day ;-) | | > I don't actually disagree with the change, but it took me by | > surprise since neither the 2.6.0-test6 annoucement nor the | > diff between the t5-bk8 and t5-bk9 logs seem to mention it. | | Well, the changelog mentions "fix for hidden task problem", since the diff | really is mainly to _add_ threads to the /proc layout. The fact that it | changed /proc/self is actually a bit surprising. Albert?
When I get this one built I'm going to see which getpid() (and family) returns as well, I never though of using /proc/self from a thread, but I do on rare occasions get my pid. | | > (It broke the perfctr driver, but I'm handling that by making | > an already planned API switch now instead of later.) | | I think /proc/self most likely _should_ point into the thread, not the | task.
Hopefully that was an unintended side effect. -- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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