On Apr 29, 2010, at 3:53 PM, Paul Johnson wrote:
When I used the latter and ran the program from Xcode, the program terminated but Xcode was not informed of that fact. (I had to click on the red stop sign in Xcode to tell it the program had ended. Maybe this is a bug -- looks like that to me at least.)
A nonzero exit code means an abnormal termination; in shell tools it's used to indicate that the tool got an error. So Xcode is probably attaching the debugger instead of just letting the app exit, so you can debug if you want.
In a GUI app I don't think anything cares what exit code it returns, so feel free to use 0. But it sounds like using a nonzero value might help you debug your app later on by it easy to stop at the point of the failure.
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