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d3affaa624
Without OS level locking it's possible to leave "lock" files on disk which will prevent next run to acquire those locks. This can easily happen if SIGKIL is issued. R=apolito@google.com, ehmaldonado@chromium.org Bug: 1049610 Change-Id: Id87aa1376b9ea5ff0c2d14f3603636493ed1dd5b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2189333 Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org> Reviewed-by: Robbie Iannucci <iannucci@chromium.org> Commit-Queue: Josip Sokcevic <sokcevic@google.com>
62 lines
2.2 KiB
Python
62 lines
2.2 KiB
Python
# Copyright 2020 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Win32 functions and constants."""
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import ctypes
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import ctypes.wintypes
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GENERIC_WRITE = 0x40000000
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CREATE_ALWAYS = 0x00000002
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FILE_ATTRIBUTE_NORMAL = 0x00000080
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LOCKFILE_EXCLUSIVE_LOCK = 0x00000002
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LOCKFILE_FAIL_IMMEDIATELY = 0x00000001
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class Overlapped(ctypes.Structure):
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"""Overlapped is required and used in LockFileEx and UnlockFileEx."""
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_fields_ = [('Internal', ctypes.wintypes.LPVOID),
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('InternalHigh', ctypes.wintypes.LPVOID),
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('Offset', ctypes.wintypes.DWORD),
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('OffsetHigh', ctypes.wintypes.DWORD),
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('Pointer', ctypes.wintypes.LPVOID),
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('hEvent', ctypes.wintypes.HANDLE)]
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# https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew
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CreateFileW = ctypes.windll.kernel32.CreateFileW
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CreateFileW.argtypes = [
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ctypes.wintypes.LPCWSTR, # lpFileName
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ctypes.wintypes.DWORD, # dwDesiredAccess
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ctypes.wintypes.DWORD, # dwShareMode
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ctypes.wintypes.LPVOID, # lpSecurityAttributes
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ctypes.wintypes.DWORD, # dwCreationDisposition
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ctypes.wintypes.DWORD, # dwFlagsAndAttributes
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ctypes.wintypes.LPVOID, # hTemplateFile
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]
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CreateFileW.restype = ctypes.wintypes.HANDLE
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# https://docs.microsoft.com/en-us/windows/win32/api/handleapi/nf-handleapi-closehandle
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CloseHandle = ctypes.windll.kernel32.CloseHandle
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CloseHandle.argtypes = [
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ctypes.wintypes.HANDLE, # hFile
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]
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CloseHandle.restype = ctypes.wintypes.BOOL
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# https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-lockfileex
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LockFileEx = ctypes.windll.kernel32.LockFileEx
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LockFileEx.argtypes = [
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ctypes.wintypes.HANDLE, # hFile
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ctypes.wintypes.DWORD, # dwFlags
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ctypes.wintypes.DWORD, # dwReserved
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ctypes.wintypes.DWORD, # nNumberOfBytesToLockLow
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ctypes.wintypes.DWORD, # nNumberOfBytesToLockHigh
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ctypes.POINTER(Overlapped), # lpOverlapped
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]
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LockFileEx.restype = ctypes.wintypes.BOOL
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# Commonly used functions are listed here so callers don't need to import
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# ctypes.
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GetLastError = ctypes.GetLastError
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Handle = ctypes.wintypes.HANDLE
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