On Mar 8, 2009, at 5:38 AM, Michael Ash wrote:
On Sat, Mar 7, 2009 at 8:30 PM, Ken Thomases <k...@codeweavers.com>
wrote:
On Mar 7, 2009, at 5:26 PM, Olivier Palliere wrote:
I am working on an application that once started, sets up some
temporary
files and so. I didn't think of it at first, but I had the case
where a
friend force quitted the application, and I was left with the app
not
running, and still my temporary things hanging around. Ultimately,
this is
ok, as a reboot will clear /tmp, but ideally, I'd like to clear it
up as
soon as possible.
Do your temp files really need to remain listed in the file
system? You can
open/create them and then unlink them. Your file descriptor (or
NSFileHandle) will remain valid and will be able to access and
manipulate
the file data, but the file won't be listed in the file system.
When your
process exits (cleanly or otherwise), the kernel will make sure all
of your
file descriptors are closed. In this case, because there are no
more links
to the file, the closing of the last file descriptor to it will
cause it to
be deleted.
And if they *really* do need to have a directory entry, your best bet
is probably to spawn a little subprocess when you create the files
that just sits and waits for its parent to die. Once the parent
disappears for any reason, it can delete the files.
Thanks a lot for your insight (both of you)!
This is basically what I did, except that currently my subprocess is
not daemon capable, as I initially wanted to get that code handled by
launchd which states *very* clearly that you should not fork or so.
Now it seems the requirements are shifting and I might have, over time
(but not before another release), to also add a *deny* rule in ipfw
when my code is running. In that case, if the app dies, then I have a
bigger problem than just files hanging around ;-) but I'll think about
this when the time comes.
Many thanks again for the help,
Olivier./.
Mike
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