ffi/signature</code>, <code class="mendoza-code">ffi/call</code> behind the scenes, and you can mix
and match the <code class="mendoza-code">ffi/defbind</code> macro with explicit bindings.
</p>
<h2 id="Callbacks">Callbacks
</h2>
<p>One limitation of Janet's FFI module is passing function pointers to C functions, such as in <code class="mendoza-code">qsort</code>.
This is unsupported in the general case, as it requires runtime generation of machine code.
Instead, callback functions must be written in C. Oft