Yes, it's a helper tool. It runs for a couple of seconds (under normal
conditions) and exits immediately. It interacts with the file system
by reading information about some directories, so its launched
duration is, of course, bound to the responsiveness of the hard drive
on which it's operating. As such, "a couple of seconds" might be "five
or ten seconds" on machines where the drive is spinning up, otherwise
busy, etc. It's certainly possible that someone might invoke fast user
switching right in the middle of the tool running, but it's /probably/
not an issue. I'm still not quite convinced it isn't, just yet. I need
to do more thinking about it. The discussion so far has been very
helpful.
As far as connecting to the window server goes, Apple states:
http://developer.apple.com/technotes/tn2005/tn2083.html#SECWINDOWSERVER
"Apple plans to disable the global window server service in a future
release of Mac OS X. Do not write any new code that uses the global
window server service."
So when you say "default window server", are you speaking of the
global window server, or the default window server associated with the
current console session?
--
m-s
On 23 Apr, 2008, at 13:04, stephen joseph butler wrote:
On Wed, Apr 23, 2008 at 11:42 AM, Dave Camp <[EMAIL PROTECTED]>
wrote:
Unless I'm reading the OP wrong, he's writing a privileged helper
tool,
not a daemon. Given that, I don't think the above documents are
applicable.
None of what I know is official, but just gathered and extrapolated
from
years of reading information about this. So I might be wrong... who
knows.
The unsafe frameworks make connections to the default window server.
As a
program launched from Finder/Dock/et al, this will always work as
expected.
Launched from ssh or root, there are some caveats.
For ssh, they will work fine as long as the same user is logged onto
the
GUI. As soon as the user logs out, your program loses its connection
and
might crash.
For root, they will work as long as the "console user" stays the
same. If
someone uses fast user switching, or logs out, then the program's
connection
changes and it might crash.
In any event, none of the unsafe frameworks are documented as
working in any
conditions other than the normal ones. People may get them to work
90% of
the time under other conditions, but that's unsupported and may
change.
So unless DTS tells you otherwise, I'd stay away. But that's me...
maybe 90%
is good enough for you.
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