Writing a plugin for Mac OS X - Archive of obsolete content
the three symbols that must always be visible are: np_initialize() np_getentrypoints() np_shutdown() the sample plugin is written entirely in c, using a standard xcode build configuration, so by default all of its symbols are c-style and visible.
... if you want to implement your plugin in c++ or objective-c++, you need to tell the compiler to export them in c format by using extern "c" in the header, like this: #pragma gcc visibility push(default) extern "c" { nperror np_initialize(npnetscapefuncs *browserfuncs); nperror np_getentrypoints(nppluginfuncs *pluginfuncs); void np_shutdown(void); } #pragma gcc visibility pop you can check to be sure your symbols are visible and in standard c format by using the nm utility provided among the mac os x developer tools: [user@foo mymac] nm basicplugin ...
... 00000810 t _np_getentrypoints 000007fa t _np_initialize 000008a0 t _np_shutdown ...

Plug-in Side Plug-in API - Plugins
np_getentrypoints undocumented.