'Re: Reboot implemention'

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List:       busybox
Subject:    Re: Reboot implemention
From:       Michael Conrad <mconrad () intellitree ! com>
Date:       2017-11-15 15:08:40
Message-ID: a4f70efb-1956-c2c5-a722-30cab67f8491 () intellitree ! com
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On 11/13/2017 8:19 PM, Cathey, Jim wrote:
>
> >Is there a reason why BusyBox's [reboot] implementation is different, 
> or is it a bug?
>
> The final fs cleanup, and the only one that really counts, is what the 
> kernel does after init(8) exits.
>

Pretty sure if init exits it is an immediate PANIC, which is not how 
most systems reboot.  I think it all ends with the reboot syscall. I'm 
not sure what the semantics are for that syscall, but it would seem that 
sync() would be wise to execute first.  Unless it's implied by reboot().

-Mike

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    <div class="moz-cite-prefix">On 11/13/2017 8:19 PM, Cathey, Jim
      wrote:<br>
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        <p class="MsoNormal" style="margin-bottom:12.0pt">&gt;Is there a
          reason why BusyBox's [reboot] implementation is different, or
          is it a bug?<o:p></o:p></p>
        <p class="MsoNormal"><span
            style="font-family:&quot;Calibri&quot;,serif">The final fs
            cleanup, and the only one that really counts, is what the
            kernel does after init(8) exits.<o:p></o:p></span></p>
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    <br>
    Pretty sure if init exits it is an immediate PANIC, which is not how
    most systems reboot.  I think it all ends with the reboot syscall. 
    I'm not sure what the semantics are for that syscall, but it would
    seem that sync() would be wise to execute first.  Unless it's
    implied by reboot().<br>
    <br>
    -Mike<br>
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