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# Copyright (c) 2016 Cloudbase Solutions Srl # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at: # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import errno import msvcrt import pywintypes import win32con import win32file 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)
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