[launchd-dev] Diagnosing launchd daemon failure to launch

Damien Sorresso dsorresso at apple.com
Thu Nov 6 13:36:55 PST 2008

On Nov 6, 2008, at 12:17 PM, Iain Delaney wrote:
> Hi Damien,
> 	Thanks for the feedback. I've looked at the SampleD code and plist,  
> but there's something I don't understand. I based my domain sockets  
> code on the code in the CFLocalServer sample program, and that code  
> uses a string constant for the socket path, shared between the  
> client and server. What is the purpose of putting the path in the  
> daemon plist? If I put the path in the plist, and the server gets it  
> from launchd, how does the client get to the socket?


This is all illustrated in SampleD. Your daemon obtains a file  
descriptor directly from launchd. This is so launchd can launch your  
daemon on-demand when there are data on the socket.

You can create a CFSocketRef with that descriptor using  
CFSocketCreateWithNative() if you wish.
Damien Sorresso
BSD Engineering
Apple Inc.

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