Issue #20005 has been updated by tagomoris (Satoshi Tagomori). @nobu No, I intended that the API retrieves `extern`-ed (or `EXPORTS`-ed in *.def) symbols. I missed to mention it. ---------------------------------------- Feature #20005: Add C API to return symbols of native extensions resolved from features https://bugs.ruby-lang.org/issues/20005#change-105330 * Author: tagomoris (Satoshi Tagomori) * Status: Open * Priority: Normal ---------------------------------------- I want an API to resolve symbols of other native extensions by a feature name and a symbol name (just like `dlsym`). (`rb_dln_resolve_symbol` is an example function name of this feature in the example below) ```c // "a_client_open" is a function defined in "/..../a_client.so", that should be loaded in Ruby beforehand. // in the extension to be "a.so" VALUE (*a_client_open)(VALUE); void Init_a(void) { a_client_open = (VALUE(*)(VALUE))rb_dln_resolve_symbol("a_client", "a_client_open"); // the return value may be NULL if the symbols is not found } ``` This API is to replace direct reference of external symbols. Currently, native extensions have to just call the function of other extensions directly on the assumption of: * The dependency native extension is already loaded * The symbol is defined correctly in the dependency (the version of dependency is correct&expected) Otherwise, it crashes. This API provides a way for developers to raise exceptions if the resolved symbol is `NULL`, and these exceptions can display meaningful messages and instructions to the users of extensions. -- https://bugs.ruby-lang.org/