Re: System bootstrap and process with pid 0

[Martin Husemann <martin%duskware.de@localhost>]

On Thu, Aug 05, 2021 at 08:02:11PM +0200, Rocky Hotas wrote:
> Shouldn't then init be that process launched by init_main.c? Instead, I
> found:
> 
> $ ps -aux -p 0
> USER PID %CPU %MEM VSZ   RSS TTY STAT STARTED    TIME COMMAND
> root   0  0.0  0.2   0 15172 ?   OKl  Mon10AM 9:57.64 [system]
> 
> $ ps -aux -p 1
> USER PID %CPU %MEM   VSZ  RSS TTY STAT STARTED    TIME COMMAND
> root   1  0.0  0.0 22700 1244 ?   Is   Mon10AM 0:00.01 init

Init is the first userland process created by init_main (and it gets PID 1).
All kernel threads have PID 0 (and there are quite a few nowadays).

Martin