title: launch agent from daemon in user context
body: <p>I have a launch daemon that runs in the login context of a Mac OSX 10.6 machine. I want to launch an agent for each user from that agent, and have the agent run in the user's login context. However, I need to control the precise arguments to the agent application very carefully, which is why I cannot use a launchd agent, like I have for the daemon.</p>
  
  <p>How can I create a process that runs in the context of the logged in user? I've trued <code>seteuid</code> and <code>setuid</code> calls, but these don't change the execution context of the agent application.</p>
  
  <p>I'm aware that this is not the recommended Apple way of doing things, but I don't really have a choice in the matter - the design of the daemon application is pretty inflexible (it has to run across many different systems). Is there a workaround that allows me to run an application in the GUI context of a logged in user, from a daemon which is running in the login context?</p>
  
  <p>I'm using C++, Carbon &amp; Cocoa.</p>