windows: add JobObject functions

Change-Id: Ib8c3fe735ed72e3b211328c89170eb03fc64b102
Reviewed-on: https://go-review.googlesource.com/c/sys/+/178777
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

windows/syscall_windows.go

@@ -251,6 +251,9 @@ func NewCallbackCDecl(fn interface{}) uintptr {
 //sys	ResetEvent(event Handle) (err error) = kernel32.ResetEvent
 //sys	PulseEvent(event Handle) (err error) = kernel32.PulseEvent
 //sys	SleepEx(milliseconds uint32, alertable bool) (ret uint32) = kernel32.SleepEx
+//sys	CreateJobObject(jobAttr *SecurityAttributes, name *uint16) (handle Handle, err error) = kernel32.CreateJobObjectW
+//sys	AssignProcessToJobObject(job Handle, process Handle) (err error) = kernel32.AssignProcessToJobObject
+//sys	TerminateJobObject(job Handle, exitCode uint32) (err error) = kernel32.TerminateJobObject
 
 // Volume Management Functions
 //sys	DefineDosDevice(flags uint32, deviceName *uint16, targetPath *uint16) (err error) = DefineDosDeviceW

windows/zsyscall_windows.go

@@ -188,6 +188,9 @@ var (
 	procResetEvent                         = modkernel32.NewProc("ResetEvent")
 	procPulseEvent                         = modkernel32.NewProc("PulseEvent")
 	procSleepEx                            = modkernel32.NewProc("SleepEx")
+	procCreateJobObjectW                   = modkernel32.NewProc("CreateJobObjectW")
+	procAssignProcessToJobObject           = modkernel32.NewProc("AssignProcessToJobObject")
+	procTerminateJobObject                 = modkernel32.NewProc("TerminateJobObject")
 	procDefineDosDeviceW                   = modkernel32.NewProc("DefineDosDeviceW")
 	procDeleteVolumeMountPointW            = modkernel32.NewProc("DeleteVolumeMountPointW")
 	procFindFirstVolumeW                   = modkernel32.NewProc("FindFirstVolumeW")
@@ -2011,6 +2014,43 @@ func SleepEx(milliseconds uint32, alertable bool) (ret uint32) {
 	return
 }
 
+func CreateJobObject(jobAttr *SecurityAttributes, name *uint16) (handle Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procCreateJobObjectW.Addr(), 2, uintptr(unsafe.Pointer(jobAttr)), uintptr(unsafe.Pointer(name)), 0)
+	handle = Handle(r0)
+	if handle == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func AssignProcessToJobObject(job Handle, process Handle) (err error) {
+	r1, _, e1 := syscall.Syscall(procAssignProcessToJobObject.Addr(), 2, uintptr(job), uintptr(process), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func TerminateJobObject(job Handle, exitCode uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procTerminateJobObject.Addr(), 2, uintptr(job), uintptr(exitCode), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
 func DefineDosDevice(flags uint32, deviceName *uint16, targetPath *uint16) (err error) {
 	r1, _, e1 := syscall.Syscall(procDefineDosDeviceW.Addr(), 3, uintptr(flags), uintptr(unsafe.Pointer(deviceName)), uintptr(unsafe.Pointer(targetPath)))
 	if r1 == 0 {