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Re:Mkfile(8) is severely syscall limited on OS X by msbarnett on Sunday February 12, 2017 @03:16PM (#13630460)
When in doubt, consult the source: https://github.com/opensource-apple/xnu/blob/53c5e2e62fc4182...

The upshot is that it looks like it constructs some non-env variable environment data on the program's stack after the posix environment.

The absolute path of the executable, followed by preemption free zone addresses, entropy, a configuration setting for malloc allocation strategy, and the address of the main thread's stack afaict.

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