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See docs/misc/xenstore.txt for documentation on live-update command. Validate that the binary exists and that the cmdline is valid, to prevent typos from taking down xenstore; if live-update fails there is no way back due to the use of exec(). Live update only proceeds if there are no active transactions, and no unprocessed input or unflushed output. Signed-off-by: Edwin Török <edvin.torok@citrix.com> Reviewed-by: Pau Ruiz Safont <pau.safont@citrix.com> Reviewed-by: Christian Lindig <christian.lindig@citrix.com>