Add userdata context variable API to PPP callbacks #1116
Merged
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See #1105 for additional context as to the rationale. As for the implementation--PPP callbacks were trickier and required a minor breaking change. The typedefs for PPP callbacks must now be generated using the
PPP_CB_TYPEDEF
macro. Unlike the base callback implementation, this implementation doesn't use trampoline generation and simply hold a separate callback list for those with context variables.