How to Manage Job Objects in .NET Using Pinvoke?

Pinvoking CreateJobObject/SetInformationJobObject in .NET

Defining Pinvoke Methods

The following Pinvoke methods provide access to native functions required for job object management:

[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
static extern IntPtr CreateJobObject(IntPtr a, string lpName);

[DllImport("kernel32.dll")]
static extern bool SetInformationJobObject(IntPtr hJob, JobObjectInfoType infoType, IntPtr lpJobObjectInfo, UInt32 cbJobObjectInfoLength);

[DllImport("kernel32.dll", SetLastError = true)]
static extern bool AssignProcessToJobObject(IntPtr job, IntPtr process);

[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CloseHandle(IntPtr hObject);

Creating a Job Object

To create a job object, use CreateJobObject:

var handle = CreateJobObject(IntPtr.Zero, null);

Setting Job Object Information

To set information for the job object, use SetInformationJobObject:

var info = new JOBOBJECT_BASIC_LIMIT_INFORMATION { LimitFlags = 0x2000 };
var extendedInfo = new JOBOBJECT_EXTENDED_LIMIT_INFORMATION { BasicLimitInformation = info };
int length = Marshal.SizeOf(typeof(JOBOBJECT_EXTENDED_LIMIT_INFORMATION));
IntPtr extendedInfoPtr = Marshal.AllocHGlobal(length);
Marshal.StructureToPtr(extendedInfo, extendedInfoPtr, false);
if (!SetInformationJobObject(handle, JobObjectInfoType.ExtendedLimitInformation, extendedInfoPtr, (uint)length))
    throw new Exception(string.Format("Unable to set information.  Error: {0}", Marshal.GetLastWin32Error()));

Adding Processes to a Job Object

To add a process to the job object, use AssignProcessToJobObject:

bool AddProcess(IntPtr processHandle) => AssignProcessToJobObject(handle, processHandle);
bool AddProcess(int processId) => AddProcess(Process.GetProcessById(processId).Handle);

Disposing a Job Object

Dispose the job object using the custom Disposable implementation:

public void Dispose()
{
    Dispose(true);
    GC.SuppressFinalize(this);
}

private void Dispose(bool disposing)
{
    if (disposed)
        return;

    if (disposing) { }

    Close();
    disposed = true;
}

public void Close()
{
    CloseHandle(handle);
    handle = IntPtr.Zero;
}

By utilizing this implementation, you can effectively create, configure, and manage job objects in your .NET applications.

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