[Mimedefang] regarding varibles lifetime(scope) in mimedefang-filter

[Jan-Pieter Cornet]

On Fri, Jan 18, 2008 at 12:05:45PM +0530, vinita batra wrote:
> Hi,
> I am using mimedefang filter for some processing on incoming mail.
> Actually i want to know if i set some vatriables in filter_begin and
> performs operation on that variable in filter() then those variables
> will be reinitialized for each incoming mail or not?
> 
> For example:
> if i decalre some variable say count=0 in filter_begin().
> then suppose filter() does count++; and accesses it at the end of filter()
> 
> 
> Now suppose i send one mail then it will be processed by mimedefang filter
> so filter_begin will be exceuted and will set count=0;
> and when filter comes to count++ it will make count =1;
> 
> Now before count is accessed by filter (in the end of filter),
> suppose i send another mail
> so again filter_begin() will be exceuted and it will set the count=0;
> 
> suppose now the filter()called by first mail reaches at the end of
> procedure and accesses the count variable. then at this time,
>  filter() will see count=1 or count=0?

You probably want to read the "MAINTAINING STATE" part in
man mimedefang-filter. It's all explained there.

-- 
Jan-Pieter Cornet <johnpc at xs4all.nl>
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