SPUG: Understanding RUID EUID and modules (fwd)

Jacinta Richardson jarich at perltraining.com.au
Wed May 16 15:38:51 PDT 2007

You might have some luck understanding this if you have a look at what Paul 
Fenwick did in Proc::UID (which I'll have to bump him on to get it "production 
ready").  Although he might use $< and $>, I can't remember.  There's a 
Perlmonks thread at  http://perlmonks.org/?node_id=361909

I remember him finding a bug in handling of $< and $>, in that they _cache_ the 
*id results.  This means that if you call an external program, or use a C 
routine which makes changes to them, $< and $> might be wrong.


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