Converted test_socket to use the patcher, fixed minor divergence from standard library's behavior (which honestly looks to me like a stdlib unit test that isn't testing what it's supposed to, but what can ya do).

eventlet/greenio.py

@@ -6,6 +6,7 @@ import errno
 import os
 import socket
 from socket import socket as _original_socket
+import sys
 import time
 
 
@@ -88,13 +89,20 @@ def socket_send(descriptor, data, flags=0):
             return 0
         raise
 
+if sys.platform[:3]=="win":
     # winsock sometimes throws ENOTCONN
+    SOCKET_BLOCKING = (errno.EWOULDBLOCK,)
     SOCKET_CLOSED = (errno.ECONNRESET, errno.ENOTCONN, errno.ESHUTDOWN)
+else:
+    # oddly, on linux/darwin, an unconnected socket is expected to block,
+    # so we treat ENOTCONN the same as EWOULDBLOCK
+    SOCKET_BLOCKING = (errno.EWOULDBLOCK, errno.ENOTCONN)
+    SOCKET_CLOSED = (errno.ECONNRESET, errno.ESHUTDOWN)
 def socket_recv(descriptor, buflen, flags=0):
     try:
         return descriptor.recv(buflen, flags)
     except socket.error, e:
-        if e[0] == errno.EWOULDBLOCK:
+        if e[0] in SOCKET_BLOCKING:
             return None
         if e[0] in SOCKET_CLOSED:
             return ''

tests/stdlib/test_socket.py

@@ -1,20 +1,19 @@
 #!/usr/bin/env python
 
-from test import test_socket
+from eventlet import patcher
-
 from eventlet.green import socket
 from eventlet.green import select
 from eventlet.green import time
 from eventlet.green import thread
 from eventlet.green import threading
 
-test_socket.socket = socket
+patcher.inject('test.test_socket',
-test_socket.select = select
+    globals(),
-test_socket.time = time
+    ('socket', socket),
-test_socket.thread = thread
+    ('select', select),
-test_socket.threading = threading
+    ('time', time),
-
+    ('thread', thread),
-from test.test_socket import *
+    ('threading', threading))
 
 if __name__ == "__main__":
     test_main()