[1] : Jargon File (4.3.1, 29 Jun 2001)

firewall code n. 1. the code you put in a system say, a telephone
   switch to make sure that the users can't do any damage. since users
   always want to be able to do everything but never want to suffer for any
   mistakes, the construction of a firewall is a question not only of
   defensive coding but also of interface presentation, so that users don't
   even get curious about those corners of a system where they can burn
   themselves. 2. any sanity check inserted to catch a can't happen
   error. wise programmers often change code to fix a bug twice: once to
   fix the bug, and once to insert a firewall which would have arrested the
   bug before it did quite as much damage.


see also:
can't happen 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

firewall code
     
        1. the code you put in a system say, a telephone switch to
        make sure that the users can't do any damage. since users
        always want to be able to do everything but never want to
        suffer for any mistakes, the construction of a firewall is a
        question not only of defensive coding but also of interface
        presentation, so that users don't even get curious about those
        corners of a system where they can burn themselves.
     
        2. any sanity check inserted to catch a can't happen error.
        wise programmers often change code to fix a bug twice: once to
        fix the bug, and once to insert a firewall which would have
        arrested the bug before it did quite as much damage.
     
        jargon file
     
     
see also:
can't happen jargon file 

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