[Bug 62858] Re: shmctl man differs from kernel operation
[Expired for manpages (Ubuntu) because there has been no activity for 60 days.] ** Changed in: manpages (Ubuntu) Status: Incomplete = Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/62858 Title: shmctl man differs from kernel operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/62858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 62858] Re: shmctl man differs from kernel operation
** Changed in: manpages (Ubuntu) Status: Confirmed = Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/62858 Title: shmctl man differs from kernel operation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/62858/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 62858] Re: shmctl man differs from kernel operation
@Hans Dietz: Hans, I'm the upstream man-pages maintainer, and I took a look at this bug report to see if I should fix anything upstream. You wrote: [[ However, setting IPC_RMID in recent Linux kernels has the important side effect of CHANGING the key associated with the segment to 0 (aka, IPC_PRIVATE). Ideally, this side effect should be removed from the kernel, but the kernel folks seem unlikely to do this (the new behavior was mentioned in a discussion). Thus, I suggest fixing the shmctl man page to mention this strange behavior in the discussion of IPC_RMID: after IPC_STAT will be set. add the phrase The segment key may be changed to IPC_PRIVATE as a side effect of IPC_RMID. ]] Your report suggests (in recent kernels) that the kernel's behavior changed at some point. As far as I can see, there has been no change from 2.2 through to 2.6.31-rc with respect to this particular point. The key was always changed to IPC_PRIVATE, so that some program could not do a shmget() with the original key in order to obtain the ID of the now deleted object. As far as I know, all other Unix systems take analogous steps (to prevent a deleted object being re-used). What is unusual about the Linux implementation (i.e., different from other systems) is this behavior described in the http://www.kernel.org/doc/man-pages/online/pages/man2/shmat.2.html man page: On Linux, it is possible to attach a shared memory segment even if it is already marked to be deleted. However, POSIX.1-2001 does not specify this behavior and many other implementations do not support it. However, again, this behavior is unchanged in Linux 2.2 to 2.6.31-rc, as far as I can see. So, at this point, it doesn't look like any change needs to be made to the man page. But, I await further input. Thanks, Michael -- shmctl man differs from kernel operation https://bugs.launchpad.net/bugs/62858 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 62858] Re: shmctl man differs from kernel operation
@David T Chen David, how did you confirm this bug? The reporter talks of behavior having been changed (though as far as I can see, nothing has changed) -- did you confirm that behavior was different in an earlier kernel version? -- shmctl man differs from kernel operation https://bugs.launchpad.net/bugs/62858 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 62858] Re: shmctl man differs from kernel operation
Confirmed in 8.04, 8.10, and Debian unstable (3.07-1). ** Changed in: manpages (Ubuntu) Status: Incomplete = Confirmed -- shmctl man differs from kernel operation https://bugs.launchpad.net/bugs/62858 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 62858] Re: shmctl man differs from kernel operation
Thank you for taking the time to report this bug and helping to make Ubuntu better. You reported this bug a while ago and there hasn't been any activity in it recently. We were wondering is this still an issue for you? Can you try with latest Ubuntu release? Thanks in advance. ** Changed in: manpages (Ubuntu) Status: New = Incomplete -- shmctl man differs from kernel operation https://bugs.launchpad.net/bugs/62858 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 62858] Re: shmctl man differs from kernel operation
** Changed in: Ubuntu Sourcepackagename: None = manpages -- shmctl man differs from kernel operation https://launchpad.net/bugs/62858 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
