Add support for recvmsg_into. Add changelog. Fixes #773.

gevent/_socket3.py

@@ -329,6 +329,15 @@ class socket(object):
                         raise
                 self._wait(self._read_event)
 
+        def recvmsg_into(self, *args):
+            while True:
+                try:
+                    return _socket.socket.recvmsg_into(self._sock, *args)
+                except error as ex:
+                    if ex.args[0] != EWOULDBLOCK or self.timeout == 0.0:
+                        raise
+                self._wait(self._read_event)
+
     def recvfrom(self, *args):
         while True:
             try:

greentest/patched_tests_setup.py

@@ -365,6 +365,7 @@ if sys.version_info[:2] >= (3, 5):
             'test_socket.InterruptedRecvTimeoutTest.testInterruptedSendTimeout',
             'test_socket.InterruptedRecvTimeoutTest.testInterruptedSendtoTimeout',
             'test_socket.InterruptedRecvTimeoutTest.testInterruptedRecvmsgTimeout',
+            'test_socket.InterruptedRecvTimeoutTest.testInterruptedRecvmsgIntoTimeout',
             'test_socket.InterruptedSendTimeoutTest.testInterruptedSendmsgTimeout',
         ]