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That appears to be the OpenSolaris C library.

I imagine that it is meant to convey that the quality is higher in this library than in GNU libc.

As the link contains a specific line number, I believe gp suggests to read comment blocks. I’m not very interested to dive into details atm, but at least the explanations seem to be on point.

Just read the code! /s

Grandparent didn't just link to "code"; they linked to a five-paragraph comment explaining what is going on. Did you read those comments before you posted your snarky reply?

I think the gist of it is that unlike the glibc implementation, the Illumos implementation of getenv() is lock-free and thread-safe.

you are a joy