launchd's job jettison logic (Was: Re: StartupItems)
launchd's job jettison logic (Was: Re: StartupItems)
- Subject: launchd's job jettison logic (Was: Re: StartupItems)
- From: Dave Zarzycki <email@hidden>
- Date: Mon, 5 Jun 2006 09:32:20 -0700
We're planning on (but not committing to) removing the jettison logic
from launchd in the Leopard timeframe.
Our internal bug tracking the mis-feature removal is: 4458207
On Jun 4, 2006, at 12:22 PM, Peter Seebach wrote:
Hmm. Well, maybe someone can tell me what I'm doing wrong with
launchd.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
<key>Label</key>
<string>localhost.script_name</string>
<key>UserName</key>
<string>kodak</string>
<key>ProgramArguments</key>
<array>
<string>/path/to/program</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
This launchd item, placed in /Library/LaunchDaemons, never gets run.
Why?
Jun 4 12:06:18 localhost launchd: localhost.script_name: getpwnam
("kodak") failed
Jun 4 12:06:18 localhost launchd: localhost.script_name: exited
with exit code: 1
Jun 4 12:06:18 localhost launchd: localhost.script_name: 9 more
failures without living at least 60 seconds will cause job removal
Does the user exist? Why, yes. This is not only a user on the
system, but
the user that gets automatically logged in once the system is booted.
So what happens? Launchd tries to launch this before the netinfo
stuff is all
up, and ends up yanking it from the job list, not because the
script or daemon
is problematic... But because the UserName key isn't viable yet.
It doesn't matter what's in the ProgramArguments, because the
program never
gets to being spawned, because the UserName doesn't work.
Doesn't this mean launchd ought to, hmm. Maybe check for
availability of
NetInfo before trying to spawn a job, then killing it for lack of
resources?
If "don't just suicide when your resources aren't available" is
such good
advice for programs in a launchd world, why doesn't launchd follow it?
-s
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