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Auto merge of nix-rust#559 - kevinmehall:mmap, r=kamalmarhubi
Actually mark mmap and related functions as `unsafe` The nix::sys::mman::mmap documentation says > Calls to mmap are inherently unsafe, so they must be made in an unsafe block. however, the function was not actually marked unsafe. * `munmap` should also be `unsafe` for obvious reasons. * `madvise` should be `unsafe` because of the `MADV_DONTNEED` flag. * `mlock` was already marked `unsafe` * `munlock` and `msync` don't strictly need to be `unsafe` despite taking pointers AFAICT, but are marked `unsafe` for consistency and in case they add additional flags in the future. [breaking-change]
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