loop: Let 'create_server' fail on socket bind errors

Author: 1st1

tests/test_tcp.py

@@ -161,6 +161,20 @@ async def start_server_ephemeral_ports():
 
         self.loop.run_until_complete(start_server_ephemeral_ports())
 
+    def test_create_server_4(self):
+        sock = socket.socket()
+        sock.bind(('127.0.0.1', 0))
+
+        with sock:
+            addr = sock.getsockname()
+
+            with self.assertRaisesRegex(OSError,
+                                        "error while attempting.*\('127.*: "
+                                        "address already in use"):
+
+                self.loop.run_until_complete(
+                    self.loop.create_server(object, *addr))
+
     def test_create_connection_1(self):
         CNT = 0
         TOTAL_CNT = 100

uvloop/loop.pyx

@@ -1069,9 +1069,12 @@ cdef class Loop:
                         try:
                             tcp.bind(addrinfo.ai_addr)
                             tcp.listen(backlog)
-                        except:
-                            tcp._close()
-                            raise
+                        except OSError as err:
+                            pyaddr = __convert_sockaddr_to_pyaddr(
+                                <system.sockaddr*>addrinfo.ai_addr)
+                            raise OSError(err.errno, 'error while attempting '
+                                          'to bind on address %r: %s'
+                                          % (pyaddr, err.strerror.lower()))
 
                         server._add_server(tcp)