Issue #8524: Add a forget() method to socket objects, so as to put the

socket into the closed state without closing the underlying file
descriptor.

Lib/ssl.py

@@ -79,7 +79,6 @@ from _ssl import (
 
 from socket import getnameinfo as _getnameinfo
 from socket import error as socket_error
-from socket import dup as _dup
 from socket import socket, AF_INET, SOCK_STREAM
 import base64        # for DER-to-PEM translation
 import traceback
@@ -148,7 +147,7 @@ class SSLSocket(socket):
                             family=sock.family,
                             type=sock.type,
                             proto=sock.proto,
-                            fileno=_dup(sock.fileno()))
+                            fileno=sock.fileno())
             self.settimeout(sock.gettimeout())
             # see if it's connected
             try:
@@ -158,7 +157,7 @@ class SSLSocket(socket):
                     raise
             else:
                 connected = True
-            sock.close()
+            sock.forget()
         elif fileno is not None:
             socket.__init__(self, fileno=fileno)
         else:

Lib/test/test_socket.py

@@ -655,6 +655,19 @@ class BasicTCPTest(SocketConnectedTest):
         self.serv_conn.send(MSG)
         self.serv_conn.shutdown(2)
 
+    def testForget(self):
+        # Testing forget()
+        f = self.cli_conn.fileno()
+        self.cli_conn.forget()
+        self.assertRaises(socket.error, self.cli_conn.recv, 1024)
+        self.cli_conn.close()
+        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, fileno=f)
+        msg = sock.recv(1024)
+        self.assertEqual(msg, MSG)
+
+    def _testForget(self):
+        self.serv_conn.send(MSG)
+
 @unittest.skipUnless(thread, 'Threading required for this test.')
 class BasicUDPTest(ThreadedUDPSocketTest):