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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.
from ctypes import c_void_p, POINTER, sizeof, Structure, windll, WinError, WINFUNCTYPE, addressof, c_size_t, c_ulong
from ctypes.wintypes import BOOL, BYTE, DWORD, HANDLE, LARGE_INTEGER
LPVOID = c_void_p
LPDWORD = POINTER(DWORD)
SIZE_T = c_size_t
ULONG_PTR = POINTER(c_ulong)
# A ULONGLONG is a 64-bit unsigned integer.
# Thus there are 8 bytes in a ULONGLONG.
# XXX why not import c_ulonglong ?
ULONGLONG = BYTE * 8
class IO_COUNTERS(Structure):
# The IO_COUNTERS struct is 6 ULONGLONGs.
# TODO: Replace with non-dummy fields.
_fields_ = [('dummy', ULONGLONG * 6)]
class JOBOBJECT_BASIC_ACCOUNTING_INFORMATION(Structure):
_fields_ = [('TotalUserTime', LARGE_INTEGER),
('TotalKernelTime', LARGE_INTEGER),
('ThisPeriodTotalUserTime', LARGE_INTEGER),
('ThisPeriodTotalKernelTime', LARGE_INTEGER),
('TotalPageFaultCount', DWORD),
('TotalProcesses', DWORD),
('ActiveProcesses', DWORD),
('TotalTerminatedProcesses', DWORD)]
class JOBOBJECT_BASIC_AND_IO_ACCOUNTING_INFORMATION(Structure):
_fields_ = [('BasicInfo', JOBOBJECT_BASIC_ACCOUNTING_INFORMATION),
('IoInfo', IO_COUNTERS)]
# see http://msdn.microsoft.com/en-us/library/ms684147%28VS.85%29.aspx
class JOBOBJECT_BASIC_LIMIT_INFORMATION(Structure):
_fields_ = [('PerProcessUserTimeLimit', LARGE_INTEGER),
('PerJobUserTimeLimit', LARGE_INTEGER),
('LimitFlags', DWORD),
('MinimumWorkingSetSize', SIZE_T),
('MaximumWorkingSetSize', SIZE_T),
('ActiveProcessLimit', DWORD),
('Affinity', ULONG_PTR),
('PriorityClass', DWORD),
('SchedulingClass', DWORD)
]
class JOBOBJECT_ASSOCIATE_COMPLETION_PORT(Structure):
_fields_ = [('CompletionKey', c_ulong),
('CompletionPort', HANDLE)]
# see http://msdn.microsoft.com/en-us/library/ms684156%28VS.85%29.aspx
class JOBOBJECT_EXTENDED_LIMIT_INFORMATION(Structure):
_fields_ = [('BasicLimitInformation', JOBOBJECT_BASIC_LIMIT_INFORMATION),
('IoInfo', IO_COUNTERS),
('ProcessMemoryLimit', SIZE_T),
('JobMemoryLimit', SIZE_T),
('PeakProcessMemoryUsed', SIZE_T),
('PeakJobMemoryUsed', SIZE_T)]
# These numbers below come from:
# http://msdn.microsoft.com/en-us/library/ms686216%28v=vs.85%29.aspx
JobObjectAssociateCompletionPortInformation = 7
JobObjectBasicAndIoAccountingInformation = 8
JobObjectExtendedLimitInformation = 9
class JobObjectInfo(object):
mapping = { 'JobObjectBasicAndIoAccountingInformation': 8,
'JobObjectExtendedLimitInformation': 9,
'JobObjectAssociateCompletionPortInformation': 7
}
structures = {
7: JOBOBJECT_ASSOCIATE_COMPLETION_PORT,
8: JOBOBJECT_BASIC_AND_IO_ACCOUNTING_INFORMATION,
9: JOBOBJECT_EXTENDED_LIMIT_INFORMATION
}
def __init__(self, _class):
if isinstance(_class, basestring):
assert _class in self.mapping, 'Class should be one of %s; you gave %s' % (self.mapping, _class)
_class = self.mapping[_class]
assert _class in self.structures, 'Class should be one of %s; you gave %s' % (self.structures, _class)
self.code = _class
self.info = self.structures[_class]()
QueryInformationJobObjectProto = WINFUNCTYPE(
BOOL, # Return type
HANDLE, # hJob
DWORD, # JobObjectInfoClass
LPVOID, # lpJobObjectInfo
DWORD, # cbJobObjectInfoLength
LPDWORD # lpReturnLength
)
QueryInformationJobObjectFlags = (
(1, 'hJob'),
(1, 'JobObjectInfoClass'),
(1, 'lpJobObjectInfo'),
(1, 'cbJobObjectInfoLength'),
(1, 'lpReturnLength', None)
)
_QueryInformationJobObject = QueryInformationJobObjectProto(
('QueryInformationJobObject', windll.kernel32),
QueryInformationJobObjectFlags
)
class SubscriptableReadOnlyStruct(object):
def __init__(self, struct):
self._struct = struct
def _delegate(self, name):
result = getattr(self._struct, name)
if isinstance(result, Structure):
return SubscriptableReadOnlyStruct(result)
return result
def __getitem__(self, name):
match = [fname for fname, ftype in self._struct._fields_
if fname == name]
if match:
return self._delegate(name)
raise KeyError(name)
def __getattr__(self, name):
return self._delegate(name)
def QueryInformationJobObject(hJob, JobObjectInfoClass):
jobinfo = JobObjectInfo(JobObjectInfoClass)
result = _QueryInformationJobObject(
hJob=hJob,
JobObjectInfoClass=jobinfo.code,
lpJobObjectInfo=addressof(jobinfo.info),
cbJobObjectInfoLength=sizeof(jobinfo.info)
)
if not result:
raise WinError()
return SubscriptableReadOnlyStruct(jobinfo.info)
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