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Re: wrapper functions in modules

Bart Schaefer wrote:

> ... [ several serious problems with the wrapper functions ]

I stand corrected.

And damn, my first idea was to let modules register only one function
which would have to call back the execution code, i.e.:

  runshfunc(list, wrappers);

runshfunc(List list, FuncWrap wrap)
  if (wrap)
    wrap->func(list, wrap->next);
  else {

example_wrapper(List list, FuncWrap wrap)  // from module
  ... do something

  runshfunc(list, wrap);

  ... restore something

This would solve the call stack problems you mentioned. Also, writing
wrappers would be easier in modules since you can use local variables, 
static local variables for number-of-calls and so on...

About the problems with unloading: I would vote for completely
disallowing to unload a module if a wrapper is active for it.
This is relatively easy to keep track of and seems to be the savest,
the question is: how often does one want to unload modules in shell

Finally about the order in which installed wrappers are to be called:
looking at load_module() it should be enough to build the wrappers
list by appending new definitions to the end.

Ok. No patch for now, just the question: does this sound ok?

And, of course, if someone has ideas for a completely different
solution, I would like to hear about it.


Sven Wischnowsky                         wischnow@xxxxxxxxxxxxxxxxxxxxxxx

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