Show HN: Running TempleOS in user space without virtualization

Re:Show HN: Running TempleOS in user space without virtualiz... by xmlparser on Friday April 12, 2024 @11:46PM (#40020316)

> Thankfully the brk heap isn't intrusive enough to climb up into the pages I allocated :)

That seems about right[1], but the MAP_FIXED_NOREPLACE flag has been a thing since Linux 4.17. What about using that?

[1]: https://godbolt.org/z/698dPcvf6

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Re:Show HN: Running TempleOS in user space without virtualiz... by 1fishe2fishe on Friday April 12, 2024 @11:53PM (#40020352)

Thanks for the information, I wasn't aware of that! Seems like it's not available on FreeBSD though ;( I want to support as many OS'es as possible, but I'll still add a comment on that for future reference.

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Re:Show HN: Running TempleOS in user space without virtualiz... by xyproto on Saturday April 13, 2024 @03:21AM (#40021206)

Could it be enabled with a define or other compile-time mechanism for Linux?

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Re:Show HN: Running TempleOS in user space without virtualiz... by 1fishe2fishe on Saturday April 13, 2024 @05:07AM (#40021667)

Yeah, I could just use that flag on Linux and let the kernel do more work but I'm afraid I might have to add more logic for looping for a failed mmap only for linux, and more ifdefs usually mean I'm doing something wrong. I'd rather roll with my current strategy (finding a safe pivot and keep bumping without checking anything)

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