I am working on integrating a Third Party C++ api in Elixir using NIFs. Here is the code sample that is shared and is working fine when I run it like a binary.
class Client: public AbstractThirdPartyClient {
public:
int ConnectionSuccess(int status) {
return status;
}
};
Client *client = new Client;
ThirdPartyControl *control;
int main () {
control = new ThirdPartyControl(client, "fully/qualified/path/to/some/config/file");
return 0;
}
But when I am trying to introduce NIFs converting to a dynamic lib (.so) file, NIF loading fails with seg fault and since ThirdPartyControl
class implementation is hidden from me, I am having a hard time figuring out why this is failing.
typedef struct {
Client *client;
ThirdPartyControl *control;
} node;
ERL_NIF_TERM setup(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
return enif_make_atom(env, "ok");
}
static ErlNifFunc nif_funcs[] = {{"setup", 0, setup}};
int load(ErlNifEnv* caller_env, void** priv_data, ERL_NIF_TERM load_info) {
try {
node *r = (node *)malloc(sizeof(node));
r->client = new Client;
/* this line causes seg fault don't know why */
r->control = new ThirdPartyControl(r->client, (char *)NULL, (char *)"fully/qualified/path/to/some/config/file");
*priv_data = r;
} catch (exception e) {
return 1;
}
return 0;
}
int upgrade(ErlNifEnv* caller_env, void** priv_data, void **old_priv_data, ERL_NIF_TERM load_info) {
return 0;
}
ERL_NIF_INIT(Elixir.Vendor.Middleware, nif_funcs, load, NULL, upgrade, NULL);