MAP_FIXED_NOREPLACE is totally unnecessary, doesn't save apps any work. Use it, you still have to check for failure. Instead, use no flag at all, and check if returned map matches hint. That's all any app needed to do.
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I forget why that didn't work for the ELF loader, but it came up during the initial design. We still needed this particular combination for getting safe memory layouts for exec.
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Interesting. Thanks for the reply. Still sounds odd.
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