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printfis not a great example. It's explicitly defined by the C spec as a function that's only available in "hosted" implementations (meaning running on a kernel, as opposed to "freestanding", which may not require one). And on most platforms,printfis a just a function provided by yourlibcthat does a bunch of stuff on your behalf (which eventually includes a syscall to print to stdout). It's really no different from callinglibvlc_media_list_add_mediaorPyObject_GetAttr, except that someprintfimplementation is guaranteed linkable without adding extra non-standard-ls.