Say I am writing my own init program running on a Linux kernel.
What happens when my init program exits with return value 0 ?
Additionally is the behaviour different if the return value is non-zero?
Answers:
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Method 1
What happens when my init program exits with return value 0?
This code, from the find_child_reaper function in kernel/exit.c, is run:
panic("Attempted to kill init! exitcode=0x%08xn",
father->signal->group_exit_code ?: father->exit_code);
And consequently this message appears on your console:
Kernel panic – not syncing: Attempted to kill init! exitcode=0x00000000
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