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ce5542d402
The old code didn't differentiate between a read error and a concurrent truncation. fread reports both of these by returning 0; you have to use feof() or ferror() to distinguish between them, which this code did not do. It might be a better idea to use read() rather than fread() here, so that we can display a less-generic error message, but I'm not sure that would qualify as a back-patchable bug fix, so just do this much for now. Jeevan Chalke, reviewed by Jeevan Ladhe and by me. Discussion: http://postgr.es/m/CA+TgmobG4ywMzL5oQq2a8YKp8x2p3p1LOMMcGqpS7aekT9+ETA@mail.gmail.com