tests: fix toctou race in tinyproxy.py (issue3795) test-http-proxy.t sometimes failed with: File ".../tests/tinyproxy.py", line 110, in _read_write data = i.recv(8192) error: (104, 'Connection reset by peer') This might have started showing up with a9fd11ffa13f ... but it has apparently also been seen before. I don't see anything in a9fd11ffa13f that can explain it. It seems to be a race in test, in the tinyproxy helper: Tinyproxy found an incoming socket using select(). It would break the loop if an error had been detected on the socket, but there was no error and it tried to recv() from the socket. That failed - apparently because it had been reset after select(). Errors in the recv() will now be caught and will break the loop like errors detected by select() would. (send() could also fail in a similar way ... but using the same solution there and losing data we have read doesn't feel right.)