New submission from Nidan: I recently had lots of the following exception: error: uncaptured python exception, closing channel <servercore_persistent.ConnectionHandler connected 127.0.0.1:53609 at 0x8d27eec> (<class 'socket.error'>:[Errno 11] Resource temporarily unavailable [/usr/lib/python2.7/asynchat.py|handle_read|110] [/usr/lib/python2.7/asyncore.py|recv|384])
Error 11 is EAGAIN or EWOULDBLOCK, so asyncore/asynchat tries to read from a nonblocking socket which has no data available. Since this is a temporary error the socket shouldn't be closed. The bug can be fixed by changing asyncore.dispatcher.recv to def recv(self, buffer_size): try: data = self.socket.recv(buffer_size) if not data: # a closed connection is indicated by signaling # a read condition, and having recv() return 0. self.handle_close() return '' else: return data except socket.error, why: # winsock sometimes throws ENOTCONN if why.args[0] in _DISCONNECTED: self.handle_close() return '' elif why.args[0] in (EAGAIN, EWOULDBLOCK): return '' else: raise While looking at the source I also saw that asyncore.dispatcher.send and .connect check against EWOULDBLOCK but not against EAGAIN. Since both constants may have different values and POSIX allows to return either of them these functions should check against both error constants. ---------- components: Library (Lib) messages: 171967 nosy: Nidan priority: normal severity: normal status: open title: asyncore.dispatcher.recv doesn't handle EAGAIN / EWOULDBLOCK type: behavior versions: Python 2.7, Python 3.3 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue16133> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com