[ovs-dev] [PATCH V7 05/16] python tests: Added fcntl module for Windows

[Paul Boca]

This is needed for lockf function used to lock the PID file on Windows.
ioctl and fcntl functions are not implemented at this time because they are
not used by any script.

Signed-off-by: Paul-Daniel Boca <pboca at cloudbasesolutions.com>
---
V2: No changes
V3: No changes
V4: No changes
V5: No changes
V6: No changes
V7: Fixed flake8 errors and removed unused functions.
---
 python/automake.mk      |  1 +
 python/ovs/fcntl_win.py | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 python/ovs/fcntl_win.py

diff --git a/python/automake.mk b/python/automake.mk
index ecad39d..1c8fa38 100644
--- a/python/automake.mk
+++ b/python/automake.mk
@@ -11,6 +11,7 @@ ovstest_pyfiles = \
 ovs_pyfiles = \
 	python/ovs/__init__.py \
 	python/ovs/daemon.py \
+	python/ovs/fcntl_win.py \
 	python/ovs/db/__init__.py \
 	python/ovs/db/data.py \
 	python/ovs/db/error.py \
diff --git a/python/ovs/fcntl_win.py b/python/ovs/fcntl_win.py
new file mode 100644
index 0000000..a558c5e
--- /dev/null
+++ b/python/ovs/fcntl_win.py
@@ -0,0 +1,28 @@
+import errno
+import win32con
+import win32file
+import pywintypes
+import msvcrt
+
+LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
+LOCK_SH = 0  # the default
+LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
+LOCK_UN = 0x80000000  # unlock - non-standard
+
+
+def lockf(fd, flags, length=0xFFFF0000, start=0, whence=0):
+    overlapped = pywintypes.OVERLAPPED()
+    hfile = msvcrt.get_osfhandle(fd.fileno())
+    if LOCK_UN & flags:
+        ret = win32file.UnlockFileEx(hfile, 0, start, length, overlapped)
+    else:
+        try:
+            ret = win32file.LockFileEx(hfile, flags, start, length, overlapped)
+        except:
+            raise IOError(errno.EAGAIN, "", "")
+
+    return ret
+
+
+def flock(fd, flags):
+    lockf(fd, flags, 0xFFFF0000, 0, 0)
-- 
2.7.2.windows.1