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A comment on What Were CGI Scripts?. Parent comment

Re:What Were CGI Scripts? by charliesome on Sunday July 21, 2019 @10:33PM (#20495013)
PIDs will recycle rather than exhausting. As an aside, that's also the reason why it's unsafe to use a PID from any process other than the parent process. As soon as the parent calls wait(2), the PID is released and could be reused for a fresh process at any moment.
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Re:What Were CGI Scripts? by JJMcJ on Monday July 22, 2019 @09:48PM (#20503818)
The only way to run out of PIDs is not wait() properly, leading to zombie processes, or else some CGI processes time out and don't exit, so never reaped by a wait().
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