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Not really news... this has been the case since the first Mac shipped with a DVD player. Wait until he tries to attach gdb while a Fairplay-encoded file is being played.

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What does happen if you try to attach gdb? You can't, or the application just quits, or do you get some error message? I'm somewhat curious now.

I think this is the story that the parent was referencing. Here's the story from 2005 and a kernel module loadable at runtime that gets around the problem.

https://blogs.oracle.com/ahl/entry/mac_os_x_and_the

http://landonf.bikemonkey.org/code/macosx/Leopard_PT_DENY_AT...

It's probably just PT_DENY_ATTACH that causes the debugger to quit.

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