- Nov 07, 2020
Wietse Venema Quotes
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- Last Updated on May 30, 2021
- Exist
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- Nov 07, 2020
Defect-free software does not exist.
- Lines
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- Nov 07, 2020
As of today, the Postfix mail transport agent has almost 50,000 lines of code, comments not included.
- Behaves
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- Nov 07, 2020
However, writing software without defects is not sufficient. In my experience, it is at least as difficult to write software that is safe - that is, software that behaves reasonably under adverse conditions.
- More
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- Nov 07, 2020
Writing software that's safe even in the presence of bugs makes the challenge even more interesting.
- Know
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- Nov 07, 2020
When I write software, I know that it will fail, either due to my own mistake, or due to some other cause.
- Life
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- Nov 07, 2020
In a previous life I wrote the software that controlled my physics experiments. That software had to deal with all kinds of possible failures in equipment. That is probably where I learned to rely on multiple safety nets inside and around my systems.
- Back
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- Nov 07, 2020
Coming back to the topic of computer security, the TCP Wrapper is an example of such a safety net. I wrote it when my systems were under attack by someone who appeared to walk through walls.
- People
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- Nov 07, 2020
I want to avoid locking people into solutions that work only with Postfix. People should have a choice in what software they want to use with Postfix, be it anti-virus or otherwise.
- Only
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- Nov 07, 2020
Like all software, Qmail can survive only when it keeps up with changing requirements.
- Effort
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- Nov 07, 2020
Most of the effort in the software business goes into the maintenance of code that already exists.
- Problems
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- Nov 07, 2020
The challenge with Postfix, or with any piece of software, is to update software without introducing problems.
- Code
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- Nov 07, 2020
Adding functionality is not just a matter of adding code.
- Nov 07, 2020