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When the system calls return `NumericLimits<ptrdiff_t>::min()`, negating the return code would produce `NumericLimits<ptrdiff_t>::max() + 1` since we are on a two's complement architecture. Because this value cannot be stored, signed overflow occurs which is UB. This can be fixed by applying the negation to `EMAXERRNO` since that's known to contain a relatively small value. Found when running tests with Clang.