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"""
Support routines for subprocess module.
Currently, this extension module is only required when using the
subprocess module on Windows.
"""
# Declare external Win32 functions
import ctypes
_kernel32 = ctypes.WinDLL('kernel32')
_CloseHandle = _kernel32.CloseHandle
_CloseHandle.argtypes = [ctypes.c_int]
_CloseHandle.restype = ctypes.c_int
_CreatePipe = _kernel32.CreatePipe
_CreatePipe.argtypes = [ctypes.POINTER(ctypes.c_int), ctypes.POINTER(ctypes.c_int),
ctypes.c_void_p, ctypes.c_int]
_CreatePipe.restype = ctypes.c_int
_GetCurrentProcess = _kernel32.GetCurrentProcess
_GetCurrentProcess.argtypes = []
_GetCurrentProcess.restype = ctypes.c_int
GetVersion = _kernel32.GetVersion
GetVersion.argtypes = []
GetVersion.restype = ctypes.c_int
_DuplicateHandle = _kernel32.DuplicateHandle
_DuplicateHandle.argtypes = [ctypes.c_int, ctypes.c_int, ctypes.c_int,
ctypes.POINTER(ctypes.c_int),
ctypes.c_int, ctypes.c_int, ctypes.c_int]
_DuplicateHandle.restype = ctypes.c_int
_WaitForSingleObject = _kernel32.WaitForSingleObject
_WaitForSingleObject.argtypes = [ctypes.c_int, ctypes.c_uint]
_WaitForSingleObject.restype = ctypes.c_int
_GetExitCodeProcess = _kernel32.GetExitCodeProcess
_GetExitCodeProcess.argtypes = [ctypes.c_int, ctypes.POINTER(ctypes.c_int)]
_GetExitCodeProcess.restype = ctypes.c_int
_TerminateProcess = _kernel32.TerminateProcess
_TerminateProcess.argtypes = [ctypes.c_int, ctypes.c_int]
_TerminateProcess.restype = ctypes.c_int
_GetStdHandle = _kernel32.GetStdHandle
_GetStdHandle.argtypes = [ctypes.c_int]
_GetStdHandle.restype = ctypes.c_int
class _STARTUPINFO(ctypes.Structure):
_fields_ = [('cb', ctypes.c_int),
('lpReserved', ctypes.c_void_p),
('lpDesktop', ctypes.c_char_p),
('lpTitle', ctypes.c_char_p),
('dwX', ctypes.c_int),
('dwY', ctypes.c_int),
('dwXSize', ctypes.c_int),
('dwYSize', ctypes.c_int),
('dwXCountChars', ctypes.c_int),
('dwYCountChars', ctypes.c_int),
("dwFillAttribute", ctypes.c_int),
("dwFlags", ctypes.c_int),
("wShowWindow", ctypes.c_short),
("cbReserved2", ctypes.c_short),
("lpReserved2", ctypes.c_void_p),
("hStdInput", ctypes.c_int),
("hStdOutput", ctypes.c_int),
("hStdError", ctypes.c_int)
]
class _PROCESS_INFORMATION(ctypes.Structure):
_fields_ = [("hProcess", ctypes.c_int),
("hThread", ctypes.c_int),
("dwProcessID", ctypes.c_int),
("dwThreadID", ctypes.c_int)]
_CreateProcess = _kernel32.CreateProcessA
_CreateProcess.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_void_p, ctypes.c_void_p,
ctypes.c_int, ctypes.c_int, ctypes.c_char_p, ctypes.c_char_p,
ctypes.POINTER(_STARTUPINFO), ctypes.POINTER(_PROCESS_INFORMATION)]
_CreateProcess.restype = ctypes.c_int
del ctypes
# Now the _subprocess module implementation
from ctypes import c_int as _c_int, byref as _byref, WinError as _WinError
class _handle:
def __init__(self, handle):
self.handle = handle
def __int__(self):
return self.handle
def __del__(self):
if self.handle is not None:
_CloseHandle(self.handle)
def Detach(self):
handle, self.handle = self.handle, None
return handle
def Close(self):
if self.handle not in (-1, None):
_CloseHandle(self.handle)
self.handle = None
def CreatePipe(attributes, size):
read = _c_int()
write = _c_int()
res = _CreatePipe(_byref(read), _byref(write), None, size)
if not res:
raise _WinError()
return _handle(read.value), _handle(write.value)
def GetCurrentProcess():
return _handle(_GetCurrentProcess())
def DuplicateHandle(source_process, source, target_process, access, inherit, options=0):
target = _c_int()
res = _DuplicateHandle(int(source_process), int(source), int(target_process),
_byref(target),
access, inherit, options)
if not res:
raise _WinError()
return _handle(target.value)
def CreateProcess(name, command_line, process_attr, thread_attr,
inherit, flags, env, start_dir, startup_info):
si = _STARTUPINFO()
if startup_info is not None:
si.dwFlags = startup_info.dwFlags
si.wShowWindow = startup_info.wShowWindow
if startup_info.hStdInput:
si.hStdInput = int(startup_info.hStdInput)
if startup_info.hStdOutput:
si.hStdOutput = int(startup_info.hStdOutput)
if startup_info.hStdError:
si.hStdError = int(startup_info.hStdError)
pi = _PROCESS_INFORMATION()
if env is not None:
envbuf = ""
for k, v in env.iteritems():
envbuf += "%s=%s\0" % (k, v)
envbuf += '\0'
else:
envbuf = None
res = _CreateProcess(name, command_line, None, None, inherit, flags, envbuf,
start_dir, _byref(si), _byref(pi))
if not res:
raise _WinError()
return _handle(pi.hProcess), _handle(pi.hThread), pi.dwProcessID, pi.dwThreadID
def WaitForSingleObject(handle, milliseconds):
res = _WaitForSingleObject(int(handle), milliseconds)
if res < 0:
raise _WinError()
return res
def GetExitCodeProcess(handle):
code = _c_int()
res = _GetExitCodeProcess(int(handle), _byref(code))
if not res:
raise _WinError()
return code.value
def TerminateProcess(handle, exitcode):
res = _TerminateProcess(int(handle), exitcode)
if not res:
raise _WinError()
def GetStdHandle(stdhandle):
res = _GetStdHandle(stdhandle)
if not res:
return None
else:
return res
STD_INPUT_HANDLE = -10
STD_OUTPUT_HANDLE = -11
STD_ERROR_HANDLE = -12
DUPLICATE_SAME_ACCESS = 2
STARTF_USESTDHANDLES = 0x100
STARTF_USESHOWWINDOW = 0x001
SW_HIDE = 0
INFINITE = 0xffffffff
WAIT_OBJECT_0 = 0
CREATE_NEW_CONSOLE = 0x010
CREATE_NEW_PROCESS_GROUP = 0x200
STILL_ACTIVE = 259
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