What is PID 0?

The very short version: Unix PIDs do start at 0! PID 0 just isn’t shown to userspace through traditional APIs. PID 0 starts the kernel, then retires to a quiet life of helping a bit with process scheduling and power management. Also the entire web is mostly wrong about PID 0, because of one sentence on Wikipedia from 16 years ago.

There’s a slightly longer short version right at the end, or you can stick with me for the extremely long middle bit!

But surely you could just google what PID 0 is, right? Why am I even publishing this?

↫ David Anderson

What a great read. Just great.


  1. 2024-06-10 7:20 am
  2. 2024-06-10 10:19 am

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