Thank you Bryan for your advice.
In examples, I see how to pass the Go pointers directly.
For example :
h := C.CString(name)
defer C.free(unsafe.Pointer(h))
gerrno, err := C.getaddrinfo(h, nil, &hints, &res)
To
h := make([]byte, len(name)+1)
copy(h, name)
gerrno, err := C.getaddrinfo((*C.char)(unsafe.Pointer(&h[0])), nil,
&hints, &res)
But I found nothing on how to append an extra 0 to the slice.
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