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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 (
POINTER,
WINFUNCTYPE,
Structure,
WinError,
addressof,
c_size_t,
c_ulong,
c_void_p,
sizeof,
windll,
)
from ctypes.wintypes import BOOL, BYTE, DWORD, HANDLE, LARGE_INTEGER
import six
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, six.string_types):
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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