rb_dlcfunc_new    240 ext/dl/cptr.c    return rb_dlcfunc_new(pdata->free, DLTYPE_VOID, "free<anonymous>", CFUNC_CDECL);
rb_dlcfunc_new    221 ext/dl/dl.h    VALUE rb_dlcfunc_new(void (*func)(), int dltype, const char * name, ID calltype);