How do I write an exception filter?
ovek at arcticnet.no
Thu Jul 10 14:55:56 CDT 2008
Stefan Kuhr wrote:
> In include/wine/exception.h, a comment from AJ says that
> "__EXCEPT(filter_func,param)" is the proper way to do it but "param"
> is not explained at all
I think that comment must be very old, the macros don't implement any
> So, how do I do these things in WINE properly?
In general, within Wine code, it's impossible. In standard C, a function
cannot reference a local variable of another function. It might be
possible with some trickery (e.g. declaring explicit register/volatile
variables), or with special compiler support (MSVC obviously has special
support for it, and perhaps gcc nested functions or something could be
For Wine, you'd have to come up with something else. Whatever the filter
function needs should be available in some other form than a stack
variable, like maybe some global or thread-local (TLS) variable, or
perhaps from some function call.
Also perhaps consider whether you need a filter function this complex at
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