Richard B. Johnson writes:
> On Mon, 30 Apr 2001, Torrey Hoffman wrote:
> > In general, is there a safe way to replace executable files for
> > programs that might be running while their on-disk images are
> > replaced?
> Yes. Perfectly safe:
> mv /usr/bin/exeimage /usr/bin/exeimage.sav
> cp /wherever/exeimage /usr/bin/exeimage
> The executing task will continue to use the old image until it exits.
Even more effective is:
mv /wherever/exeimage /usr/bin/exeimage
The kernel keeps around the contents of the old file while
the executing process still runs.
This is also basically how things like libc get installed.
A single mv is not only preserves currently referenced contents,
it is atomic.
David S. Miller
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This archive was generated by hypermail 2b29 : Mon Apr 30 2001 - 21:00:26 EST