This function unloads the dynamic library specified by the identifier h, which is a return value from a previous call to dl_load. Any function references returned by dl_find for this library become invalid after dl_unload is executed. Note that the operating system normally uses a reference count to manage dynamically loaded libraries, so dl_unload may not actually unload the library. However, the handle h will no longer be valid after the call to dl_unload.

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