How to use a native C function as callback function in jswrap functions?

In a C native module, I want to call other jswrap functions and asign my C function as the callback.

How to do that?
For example,
void mycallback();

void mycallback(){
    jsiConsolePrint("Hello world");
}
jswrap_net_connect(JsVar *options, JsVar *callback, SocketType socketType); // here I want asign mycallback( ) as the callback