I'm looking for the code in the linux kernel (2.4.x) that initializes the first process, pid=0.
Many searches provided many clues, but I still cannot find it.
Any pointers, anyone?
+1
A:
check out rest_init() at the end
// idle process, pid = 0
cpu_idle(); // never return
dotjoe
2010-03-24 21:16:09
Thanks, I was already looking at that page, so now I know I was on the right path.Where in there is the first task_struct created and populated?
Tzafrir
2010-03-24 21:17:39
Which process has pid=0? Are you talking about something before `init`?
dotjoe
2010-03-24 21:23:07
The problem I was asked to solve was to add a field to task_struct. I'd like to initialize it, and have each fork() copy it, but can't find where the initial value is set.
Tzafrir
2010-03-24 21:25:54
At least with the 2.6 kernel, I think `init` always gets pid 0.
Sarah Vessels
2010-03-24 21:46:39
maybe sched.c `schedule()`?
dotjoe
2010-03-24 21:52:06
`init` always gets a PID of 1. PID zero is the 'idle' process.
Kevin Panko
2010-03-24 22:16:58
+2
A:
The initial task struct is set up by the macro INIT_TASK(), defined in include/linux/init_task.h. All other task structs are created by do_fork.
caf
2010-03-25 03:13:18