IO library: IO buffer fix read return code in the case of read failure where first / single buffer can satisfy read, by returning errno value.
IO library: IO buffer fix read return code in the case of read failure where first / single buffer can satisfy read, by returning errno value.

quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs,quantcast/qfs