Eyra is a new implementation of libc in Rust that addresses this in its default configuration: "Eyra solves this by having setenv etc. just leak the old memory

Eyra is a new implementation of libc in Rust that addresses this in its default configuration: "Eyra solves this by having setenv etc. just leak the old memory. That ensures that it stays valid for as long as any thread needs it. Granted, leaking isn't great, and Eyra makes it configurable with the threadsafe-setenv cargo feature, so it can be disabled in favor of the thread-unsafe implementation. " https://blog.sunfishcode.online/eyra-does-the-impossible/ https://blog.sunfishcode.online/eyra-does-the-impossible/