[xmlparser]

> 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

[1fishe2fishe]

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.

[xyproto]

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

[1fishe2fishe]

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)