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Namely, don't overwrite all the other flags when twiddling O_NONBLOCK, and add basic error handling. Coverity-ID: 1055041 Signed-off-by: Matthew Daley <mattjd@gmail.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Reviewed-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>