If I understood correctly you get a segfault when having the C function with 2 args (s7_scheme and s7_pointer) but passing only s7_scheme.
This seems relevant: https://stackoverflow.com/questions/12572575/i-can-call-a-function-imported-with-dlsym-with-a-wrong-signature-why and particularly the answer saying "C uses cdecl call conversion (so caller clears the stack) [..] But actually behavior is undefined" In any case, I'm really noob in this area so that's all I can contribute. So my 2 cents: - when not having passed init_args: calling the C init_func(s7_scheme) (serving also as backwards compatibility) - when init_args is present, calling init_func(s7_scheme, s7_pointer) On Thu, 22 Oct 2020 at 21:57, <[email protected]> wrote: > > how does C behave if you assume that the called function has a > > signature > > of (s7_scheme* sc) and you try to pass (s7_scheme* sc, s7_pointer args) > > ? > > I tried it with the tlib example, and if you declare args in C, but > don't pass them in scheme (i.e. no init_args in the environment), > I get a segfault. The other way (no args declared, but you pass and > use them anyway) seems to work -- strange! This is in gcc 10.2 > in Linux. > >
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