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From: "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de>
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To: Adrian Chadd <adrian@freebsd.org>
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Cc: freebsd-stable@freebsd.org, Clint Olsen <clint.olsen@gmail.com>
Subject: Re: Source upgrade from 5.5 to 6.X not safe?
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Adrian Chadd wrote:
> On 11/11/2007, [LoN]Kamikaze <LoN_Kamikaze@gmx.de> wrote:
>> If a binary/library that is currently used gets removed/replaced, it will be
>> copied to memory. The process will not even recognize this. Only restarting
>> the process will remove the old version from memory and cause the new one to
>> be used. I thought every OS did it like that, so I'm surprised that there are
>> systems causing problems in this case.
> 
> Wha, when did that happen? I was always under the impression that
> binaries/libraries were demand paged in and referenced as a VM object
> via VFS; you could unlink/rename the file and the currently open
> reference would still be valid.

I didn't know that binaries and libraries keep a reference to the file they
were created from. Anyway, to the user the whole thing is transparent.