[ocaml-ctypes] Structs with malloc allocated fields

[Travis Brady]

I'm wrapping a simple library that contains a few functions that call
malloc or realloc internally to allocate a few struct members and I'm
wondering how to make those behave with Ctypes and the GC.

The library exposes structname_free functions where applicable, but I'm not
certain how to tell Ctypes how to use them or if I even need to at all.

I've read through the ctypes examples, tests and other code from onanomsg
and ocaml-libnl to no avail.

Anyone mind sharing any tips here?

thank you
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