Merge "Load the glibc library only once for Pyroute2" into stable/train

neutron/privileged/agent/linux/ip_lib.py

@@ -10,6 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import ctypes
+from ctypes import util as ctypes_util
 import errno
 import functools
 import os
@@ -38,6 +40,15 @@ _IP_VERSION_FAMILY_MAP = {4: socket.AF_INET, 6: socket.AF_INET6}
 
 NETNS_RUN_DIR = '/var/run/netns'
 
+_CDLL = None
+
+
+def _get_cdll():
+    global _CDLL
+    if not _CDLL:
+        _CDLL = ctypes.CDLL(ctypes_util.find_library('c'), use_errno=True)
+    return _CDLL
+
 
 @lockutils.synchronized("privileged-ip-lib")
 # NOTE(slaweq): Because of issue with pyroute2.NetNS objects running in threads
@@ -509,7 +520,7 @@ def create_netns(name, **kwargs):
     :param name: The name of the namespace to create
     """
     try:
-        netns.create(name, **kwargs)
+        netns.create(name, libc=_get_cdll())
     except OSError as e:
         if e.errno != errno.EEXIST:
             raise
@@ -522,7 +533,7 @@ def remove_netns(name, **kwargs):
     :param name: The name of the namespace to remove
     """
     try:
-        netns.remove(name, **kwargs)
+        netns.remove(name, libc=_get_cdll())
     except OSError as e:
         if e.errno != errno.ENOENT:
             raise