[launchd-dev] Daemon & Network Availability?

Karl Moskowski kolpanic at voodooergonomics.com
Mon Nov 10 08:09:34 PST 2008

Hello, all!

I'm working on a project comprised of a launchd daemon and a GUI  
client app. I used the BetterAuthorizationSample project as a template  
for installing and starting up the daemon the first time. In the  
daemon's start-up code, it connects to a remote server. It all works  
fine on installation. However, when I reboot my computer, the daemon  
starts up, but the network isn't available yet, and the connection  

I tried using SystemConfiguration notifications to receive changes to  
the network state, but that doesn't work - the computer has an IP  
address at that point, but the remote server is still not reachable. I  
also tried setting the KeepAlive option in the daemon's plist to  
NetworkState = true. However, that doesn't seem to work either - it  
just starts as KeepAlive = true.

Is there some other way to indicate a dependency on the network? Do I  
need a delay at start up to wait for a connection? For better or  
worse, I used a named DO connection to handle IAC between the daemon &  
GUI. Could this be part of the problem (the caveats in TN2083 lead me  
to believe it's just inadvisable but not wrong outright)? Also, is  
launchd checkin, etc., required? I did have it in main(), but it kept  
failing, even though I had ServiceIPC = true. In case it helps, the  
current daemon plist is below.


Karl Moskowski <kolpanic at voodooergonomics.com>
Voodoo Ergonomics Inc. <http://voodooergonomics.com/>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd 
<plist version="1.0">

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