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…constructors. But that sucks hard, because in so many cases system level C code must be able to ensure that all fds are closed (for example, in systemd we require this when we load MAC policy, so that all fds are definitely labelled properly, and for many other reasons) at some time, but if "hidden" fds are kept open, that cannot be reasonably closed unless a library is unloaded then things are just unworkable.

Anyway, there are other reasons ELF constructors/destructors are shit, …