This is handle-pass style, and is the most straightforward way to add objects to existing C code (it’s “backwards compatible”). However, it makes shimming and partial derivation nearly impossible. Instead, the entire table should be passed back:
typedef struct intf intf;
int (*newIntfCB)(intf*, ...)
typedef stuct intf {
void *handle;
newIntfCB newIntf;
} intf;
(Here’s hoping beachside phone programming has resulted in valid C code.)
