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In particular this causes us to turn O_NONBLOCK back off if we set it. The caller may continue to use the fd for it's own protocol needs and may not be prepared to have it become non-blocking. This probably only effects Remus now after my previous patch to signal the last checkpoint, since a regular migration will no longer set the fd non-blocking. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Brendan Cully <brendan@cs.ubc.ca> Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>