On Sep 5, 2007, at 6:48 PM, [EMAIL PROTECTED] wrote:
James Berry <[EMAIL PROTECTED]> writes:
For those cases where startupitem.executable cannot be used, daemondo
also supports the startupitem.pidfile commands that allow the
process' pidfile to be monitored: daemondo will read the pidfile and
watch for the death of that process.
So daemondo, and thus launchd, will be aware of the daemon process
death (and be able to restart the daemon process) only under two
circumstances:
(1) startupitem.executable was supplied (thus daemondo starts the
process)
(2) startupitem.pidfile was supplied (thus daemondo reads the
process id)
Under all other circumstances, daemondo will not know that the daemon
process has died, and will not exit when the process does die, and
thus launchd won't restart the process since it doesn't know it
died. Put another way, if daemondo can know the process has died,
then launchd will know too, but not otherwise.
These statements seem incompatible with ....
The pidfile keyword is likely used only if executable is not.
This one.
I don't see the incompatibility of those statements, but then I again
I know what i meant, not necessarily what it means to others ;). The
later sentence, btw, is missing a word on the end. It should read:
"the pidfile keyword is likely useful only if the executable keyword
is not specified." Does that help any?
Looks to me like startupitem.pidfile must be set for a deamon to be
tracked whether it is executable startupitem or not.
No, daemondo will track an "executable" in an case (and it doesn't
need to know where their pidfile is, generally, since it launches the
code and thus knows the pid). In the case of script code (non
"executable") daemondo doesn't know the pid, since it doesn't know
what the script code did. In this case, it has to rely on reading a
pidfile to get the process id, or else simply not know.
And the man page
says startupitem.pidfile is "particularly useful" for
startupitem.executable. Can you explain this?
That was either garbage to begin with, or else got messed up in
creation of the man page. Off the top of my head I can't see any
particular reason to use a pidfile keyword in conjunction with the
executable keyword, unless it's to specify that it should delete a
pidfile created by the executable, and I'm not sure that even works
for that case.
Hope that helps.
James
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