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?
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asked Apr 13 '15 at 7:30
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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%08x\n",
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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Thank you! I misunderstood the message, and was thinking this is the kernel panic you will get if you try to send a kill signal to init, not the action performed if init just returns. – Bjarke Freund-Hansen Apr 28 '15 at 9:13
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1@BjarkeFreund-Hansen There is no such thing as "just returns" for a process. When you return from
mainin aCprogram, you return to a stub function in theClibrary that then invokes a system call to end the process, just as if you calledexit(). – DepressedDaniel Mar 21 '17 at 22:54 -
1@DepressedDaniel: Thank you, that broadens my understanding. :) – Bjarke Freund-Hansen Mar 29 '17 at 8:04
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