diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..706fd07
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.idea
+.vscode
diff --git a/process.go b/process.go
index 11bdef4..53981c9 100644
--- a/process.go
+++ b/process.go
@@ -28,7 +28,6 @@ type StarCmd struct {
 	errout       []byte
 	runerr       error
 	exitcode     int
-	customCtx    context.Context
 	stdoutBuf    *bytes.Buffer
 	stderrBuf    *bytes.Buffer
 	stdoutpoint  int
@@ -314,9 +313,13 @@ func (starcli *StarCmd) ExitCode() int {
 	return starcli.exitcode
 }
 
-func (starcli *StarCmd) Kill() {
-	starcli.CMD.Process.Kill()
+func (starcli *StarCmd) Kill() error{
+	err:=starcli.CMD.Process.Kill()
+	if err!=nil{
+		return err
+	}
 	starcli.running = false
+	return nil
 }
 
 func (starcli *StarCmd) GetPid() int {
diff --git a/process_unix.go b/process_unix.go
index 1fd153c..3b3e193 100644
--- a/process_unix.go
+++ b/process_unix.go
@@ -283,25 +283,49 @@ func Daemon(path string, args ...string) (int, error) {
 	return pid, err
 }
 
-func (starcli *StarCmd) SetRunUser(uid, gid uint32) {
+func DaemonWithUser(uid, gid uint32,groups []uint32,path string, args ...string) (int, error) {
+	cmd := exec.Command(path, args...)
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Credential: &syscall.Credential{
+			Uid: uid,
+			Gid: gid,
+			Groups: groups,
+		},
+		Setsid: true,
+	}
+	if err := cmd.Start(); err != nil {
+		return -1, err
+	}
+	pid := cmd.Process.Pid
+	err := cmd.Process.Release()
+	return pid, err
+}
+
+func (starcli *StarCmd) SetRunUser(uid, gid uint32,groups []uint32) {
 	starcli.CMD.SysProcAttr = &syscall.SysProcAttr{
 		Credential: &syscall.Credential{
 			Uid: uid,
 			Gid: gid,
+			Groups: groups,
 		},
 		Setsid: true,
 	}
 }
 
 func (starcli *StarCmd) Release() error {
-	if err := starcli.CMD.Start(); err != nil {
-		return err
+	if starcli.CMD.SysProcAttr == nil {
+		starcli.CMD.SysProcAttr = &syscall.SysProcAttr{
+			Setsid: true,
+		}
+	} else {
+		starcli.CMD.SysProcAttr.Setsid = true
 	}
-	starcli.CMD.SysProcAttr = &syscall.SysProcAttr{
-		Setsid: true,
+	if !starcli.IsRunning() {
+		if err := starcli.CMD.Start(); err != nil {
+			return err
+		}
 	}
-	starcli.CMD.Process.Release()
-	return nil
+	return starcli.CMD.Process.Release()
 }
 
 func (starcli *StarCmd) SetKeepCaps() error {
@@ -311,3 +335,11 @@ func (starcli *StarCmd) SetKeepCaps() error {
 	}
 	return nil
 }
+
+func SetKeepCaps() error {
+	_, _, err := syscall.RawSyscall(157 /*SYS PRCTL */, 0x8 /*PR SET KEEPCAPS*/, 1, 0)
+	if 0 != err {
+		return err
+	}
+	return nil
+}