On 03/12/2014 07:27 PM, Jussi Laako wrote:
On 12.3.2014 11:41, Carsten Haitzler wrote:
imho most of these are legacy "mistakes" we have had to live with. we
shouldn't emulate them in apps, daemons or libraries. the mail and spool
at least. /dev/mqueue /var/tmp or /tmp (and /var/run/username) are well
known locations that can be cleaned up.
We still have to be able to deal with those. gumd is not written to be
specific to Tizen, it should work on any Linux distro.
There's no standard way to list/find items in mqueue/sem/shm or Linux
anonymous socket (AF_UNIX name prefixed by \0) namespaces so we cannot
clean up those and I don't think it is straight as a job of gumd.
well you could just do the equivalen of "find / -print -uid ID -exec 'rm
-rf'" :)
/var/run/username is cleaned up PAM, because it is specified that it
must not survive across sessions.
any resouce stil around is now accessible by the new user recycling the
uid. shm/semaphores/mqs honestly should be cleaned up on clean exit of
any user processes that use them (unlink them etc.). (they can leak and
hang around though on unclean exits). if you still are running processes
as the uid on deletion... then that needs to be fixed by ensuring they
are all terminated on user delete.
We terminate the processes on user deletion, but especially if we need
to SIGKILL those, anything that would need unlink to be cleaned up
will be left over.
I would say Unix multiuser as such is racy when it comes to
adding/deleting users. There's nothing across the system to enforce
those operations to be atomic in overall system scope.
you should at least be NICE and first kill with a SIGINT ... and wait a
bit for them to exit. if they are still around after a few seconds (lets
say 5) then SIGKILL them. sigkilling out of the box is just rude. :)
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