better process killing

vendor/github.com/jesseduffield/kill/kill_windows.go

@@ -0,0 +1,136 @@
+// adapted from https://blog.csdn.net/fyxichen/article/details/51857864
+
+package kill
+
+import (
+	"os"
+	"os/exec"
+	"syscall"
+	"unsafe"
+)
+
+// Kill kills a process, along with any child processes it may have spawned.
+func Kill(cmd *exec.Cmd) error {
+	if cmd.Process == nil {
+		// You can't kill a person with no body
+		return nil
+	}
+
+	pids := Getppids(uint32(cmd.Process.Pid))
+	for _, pid := range pids {
+		pro, err := os.FindProcess(int(pid))
+		if err != nil {
+			continue
+		}
+
+		pro.Kill()
+	}
+
+	return nil
+}
+
+// PrepareForChildren ensures that child processes of this parent process will share the same group id
+// as the parent, meaning when the call Kill on the parent process, we'll kill
+// the whole group, parent and children both. Gruesome when you think about it.
+func PrepareForChildren(cmd *exec.Cmd) {
+	// do nothing because on windows our Kill function handles children by default.
+}
+
+const (
+	MAX_PATH           = 260
+	TH32CS_SNAPPROCESS = 0x00000002
+)
+
+type ProcessInfo struct {
+	Name string
+	Pid  uint32
+	PPid uint32
+}
+
+type PROCESSENTRY32 struct {
+	DwSize              uint32
+	CntUsage            uint32
+	Th32ProcessID       uint32
+	Th32DefaultHeapID   uintptr
+	Th32ModuleID        uint32
+	CntThreads          uint32
+	Th32ParentProcessID uint32
+	PcPriClassBase      int32
+	DwFlags             uint32
+	SzExeFile           [MAX_PATH]uint16
+}
+
+type HANDLE uintptr
+
+var (
+	modkernel32                  = syscall.NewLazyDLL("kernel32.dll")
+	procCreateToolhelp32Snapshot = modkernel32.NewProc("CreateToolhelp32Snapshot")
+	procProcess32First           = modkernel32.NewProc("Process32FirstW")
+	procProcess32Next            = modkernel32.NewProc("Process32NextW")
+	procCloseHandle              = modkernel32.NewProc("CloseHandle")
+)
+
+func Getppids(pid uint32) []uint32 {
+	infos, err := GetProcs()
+	if err != nil {
+		return []uint32{pid}
+	}
+	var pids []uint32 = make([]uint32, 0, len(infos))
+	var index int = 0
+	pids = append(pids, pid)
+
+	var length int = len(pids)
+	for index < length {
+		for _, info := range infos {
+			if info.PPid == pids[index] {
+				pids = append(pids, info.Pid)
+			}
+		}
+		index += 1
+		length = len(pids)
+	}
+	return pids
+}
+
+func GetProcs() (procs []ProcessInfo, err error) {
+	snap := createToolhelp32Snapshot(TH32CS_SNAPPROCESS, uint32(0))
+	if snap == 0 {
+		err = syscall.GetLastError()
+		return
+	}
+	defer closeHandle(snap)
+	var pe32 PROCESSENTRY32
+	pe32.DwSize = uint32(unsafe.Sizeof(pe32))
+	if process32First(snap, &pe32) == false {
+		err = syscall.GetLastError()
+		return
+	}
+	procs = append(procs, ProcessInfo{syscall.UTF16ToString(pe32.SzExeFile[:260]), pe32.Th32ProcessID, pe32.Th32ParentProcessID})
+	for process32Next(snap, &pe32) {
+		procs = append(procs, ProcessInfo{syscall.UTF16ToString(pe32.SzExeFile[:260]), pe32.Th32ProcessID, pe32.Th32ParentProcessID})
+	}
+	return
+}
+
+func createToolhelp32Snapshot(flags, processId uint32) HANDLE {
+	ret, _, _ := procCreateToolhelp32Snapshot.Call(uintptr(flags), uintptr(processId))
+	if ret <= 0 {
+		return HANDLE(0)
+	}
+	return HANDLE(ret)
+}
+
+func process32First(snapshot HANDLE, pe *PROCESSENTRY32) bool {
+	ret, _, _ := procProcess32First.Call(uintptr(snapshot), uintptr(unsafe.Pointer(pe)))
+	return ret != 0
+}
+
+func process32Next(snapshot HANDLE, pe *PROCESSENTRY32) bool {
+	ret, _, _ := procProcess32Next.Call(uintptr(snapshot), uintptr(unsafe.Pointer(pe)))
+	return ret != 0
+}
+
+func closeHandle(object HANDLE) bool {
+	ret, _, _ := procCloseHandle.Call(uintptr(object))
+	return ret != 0
+}