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timeval: Import ctypes Python library within a try statement.

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Older versions of Python do not have ctypes as a default installed
package. This patch puts the 'import ctypes' statement inside a try
statement.

This fixes a bug introduced by commit 8396f (timeval: Use monotonic
time in OVS Python timeval library).

Signed-off-by: Ryan Wilson <wryan@nicira.com>
Acked-by: Alex Wang <alexw@nicira.com>
This commit is contained in:
Ryan Wilson
2014-05-30 17:36:46 -07:00
committed by Alex Wang
parent 8396f8070b
commit 813c5ba585
1 changed files with 8 additions and 8 deletions
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8
python/ovs/timeval.py
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@@ -12,20 +12,20 @@
# See the License for the specific language governing permissions and # See the License for the specific language governing permissions and
# limitations under the License. # limitations under the License.
import ctypes
import sys
import time import time
LIBRT = 'librt.so.1' LIBRT = 'librt.so.1'
CLOCK_MONOTONIC = 1 CLOCK_MONOTONIC = 1
class timespec(ctypes.Structure): try:
import ctypes
class timespec(ctypes.Structure):
_fields_ = [ _fields_ = [
('tv_sec', ctypes.c_long), ('tv_sec', ctypes.c_long),
('tv_nsec', ctypes.c_long), ('tv_nsec', ctypes.c_long),
] ]
try:
librt = ctypes.CDLL(LIBRT) librt = ctypes.CDLL(LIBRT)
clock_gettime = librt.clock_gettime clock_gettime = librt.clock_gettime
clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)] clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]