How to use Kill method of launcher Package

Best Rod code snippet using launcher.Kill

launcher.go

Source:launcher.go

...29	Start() (Connector, error)30	// Returns true iff the instance is running.31	IsRunning() (bool, error)32	// Stops the instance. This is allowed to take up to 3 seconds to return.33	Kill() error34}35const successfulBootMarker = "{{{reset}}}"36const qemuBootTimeout = 10 * time.Second37// A QemuLauncher starts Fuchsia on QEMU38type QemuLauncher struct {39	Pid    int40	TmpDir string41	build Build42	// Paths to files that are created by Prepare():43	initrd      string44	extendedBlk string45	// Overridable for testing46	timeout time.Duration47}48// NewQemuLauncher constructs a new QemuLauncher49func NewQemuLauncher(build Build) *QemuLauncher {50	return &QemuLauncher{build: build, timeout: qemuBootTimeout}51}52// Find an unused TCP port on the host53func getFreePort() (int, error) {54	listener, err := net.Listen("tcp", "localhost:0")55	if err != nil {56		return 0, err57	}58	port := listener.Addr().(*net.TCPAddr).Port59	// Technically this might get used before QEMU starts...60	listener.Close()61	return port, nil62}63// Configure QEMU appropriately64func getQemuInvocation(binary, kernel, initrd, blk string, port int) ([]string, error) {65	qemuCmd := &qemu.QEMUCommandBuilder{}66	qemuCmd.SetBinary(binary)67	qemuCmd.SetTarget(qemu.TargetEnum.X86_64, true /* KVM */)68	qemuCmd.SetKernel(kernel)69	qemuCmd.SetInitrd(initrd)70	qemuCmd.SetCPUCount(4)71	qemuCmd.SetMemory(3072 /* MiB */)72	qemuCmd.AddVirtioBlkPciDrive(qemu.Drive{73		ID:   "d0",74		File: blk,75	})76	network := qemu.Netdev{77		ID:     "net0",78		Device: qemu.Device{Model: qemu.DeviceModelVirtioNetPCI},79		User: &qemu.NetdevUser{80			Network:   "192.168.3.0/24",81			DHCPStart: "192.168.3.9",82			Host:      "192.168.3.2",83			Forwards:  []qemu.Forward{{HostPort: port, GuestPort: 22}},84		},85	}86	network.Device.AddOption("mac", "52:54:00:63:5e:7b")87	qemuCmd.AddNetwork(network)88	// The system will halt on a kernel panic instead of rebooting.89	qemuCmd.AddKernelArg("kernel.halt-on-panic=true")90	// Do not print colors.91	qemuCmd.AddKernelArg("TERM=dumb")92	// Necessary to redirect serial to stdout for x86.93	qemuCmd.AddKernelArg("kernel.serial=legacy")94	qemuCmd.SetFlag("-nographic")95	qemuCmd.SetFlag("-serial", "stdio")96	qemuCmd.SetFlag("-monitor", "none")97	entropy := make([]byte, 32)98	if _, err := rand.Read(entropy); err == nil {99		qemuCmd.AddKernelArg("kernel.entropy-mixin=" + hex.EncodeToString(entropy))100	}101	return qemuCmd.Build()102}103func fileExists(path string) bool {104	_, err := os.Stat(path)105	return !os.IsNotExist(err)106}107// Prepare files that are needed by QEMU, if they haven't already been prepared.108//109// If Prepare succeeds, it is up to the caller to clean up by calling Kill later.110// However, if it fails, any resources will have been automatically released.111func (q *QemuLauncher) Prepare() (returnErr error) {112	paths, err := q.build.Path("zbi", "fvm", "blk", "authkeys", "zbitool")113	if err != nil {114		return fmt.Errorf("Error resolving qemu dependencies: %s", err)115	}116	zbi, fvm, blk, authkeys, zbitool := paths[0], paths[1], paths[2], paths[3], paths[4]117	// Create a tmpdir to store files we need118	if q.TmpDir == "" {119		tmpDir, err := ioutil.TempDir("", "clusterfuchsia-qemu-")120		if err != nil {121			return fmt.Errorf("Error creating tempdir: %s", err)122		}123		q.TmpDir = tmpDir124	}125	// If we fail after this point, we need to make sure to clean up126	defer func() {127		if returnErr != nil {128			q.cleanup()129		}130	}()131	// Stick our SSH key into the authorized_keys files132	initrd := path.Join(q.TmpDir, "ssh-"+path.Base(zbi))133	if !fileExists(initrd) {134		// TODO(fxbug.dev/45424): generate ssh key per-instance135		entry := "data/ssh/authorized_keys=" + authkeys136		if err := CreateProcessForeground(zbitool, "-o", initrd, zbi, "-e", entry); err != nil {137			return fmt.Errorf("adding ssh key failed: %s", err)138		}139	}140	q.initrd = initrd141	// Make an expanded copy of the disk image142	extendedBlk := path.Join(q.TmpDir, "extended-"+path.Base(blk))143	if !fileExists(extendedBlk) {144		if err := CreateProcessForeground("cp", blk, extendedBlk); err != nil {145			return fmt.Errorf("cp failed: %s", err)146		}147		if err := CreateProcessForeground(fvm, extendedBlk, "extend",148			"--length", "3G"); err != nil {149			return fmt.Errorf("fvm failed: %s", err)150		}151	}152	q.extendedBlk = extendedBlk153	return nil154}155// Start launches QEMU and waits for it to get through the basic boot sequence.156// Note that networking will not necessarily be fully up by the time Start() returns157//158// If Start succeeds, it is up to the caller to clean up by calling Kill later.159// However, if it fails, any resources will have been automatically released.160func (q *QemuLauncher) Start() (conn Connector, returnErr error) {161	running, err := q.IsRunning()162	if err != nil {163		return nil, fmt.Errorf("Error checking run state: %s", err)164	}165	if running {166		return nil, fmt.Errorf("Start called but already running")167	}168	paths, err := q.build.Path("qemu", "kernel", "sshid")169	if err != nil {170		return nil, fmt.Errorf("Error resolving qemu dependencies: %s", err)171	}172	binary, kernel, sshid := paths[0], paths[1], paths[2]173	port, err := getFreePort()174	if err != nil {175		return nil, fmt.Errorf("couldn't get free port: %s", err)176	}177	if err := q.Prepare(); err != nil {178		return nil, fmt.Errorf("error while preparing to start: %s", err)179	}180	// If we fail after this point, we need to make sure to clean up181	defer func() {182		if returnErr != nil {183			q.cleanup()184		}185	}()186	invocation, err := getQemuInvocation(binary, kernel, q.initrd, q.extendedBlk, port)187	if err != nil {188		return nil, fmt.Errorf("qemu configuration error: %s", err)189	}190	cmd := NewCommand(invocation[0], invocation[1:]...)191	// TODO(fxbug.dev/45431): log qemu output to some global tempfile to match current CF behavior192	outPipe, err := cmd.StdoutPipe()193	if err != nil {194		return nil, fmt.Errorf("error attaching stdout: %s", err)195	}196	cmd.Stderr = cmd.Stdout // capture stderr too197	// Save early log in case of error198	var log []string199	errCh := make(chan error)200	go func() {201		scanner := bufio.NewScanner(outPipe)202		for scanner.Scan() {203			line := scanner.Text()204			log = append(log, line)205			if strings.Contains(line, successfulBootMarker) {206				// Early boot has finished207				errCh <- nil208				return209			}210		}211		if err := scanner.Err(); err != nil {212			errCh <- fmt.Errorf("failed during scan: %s", err)213			return214		}215		errCh <- fmt.Errorf("qemu exited early")216	}()217	if err := cmd.Start(); err != nil {218		return nil, fmt.Errorf("failed to start qemu: %s", err)219	}220	q.Pid = cmd.Process.Pid221	glog.Info("Waiting for boot to complete...")222	select {223	case err := <-errCh:224		if err != nil {225			// Kill the process, just in case this was an error other than EOF226			cmd.Process.Kill()227			// Dump the boot log228			glog.Errorf(strings.Join(log, "\n"))229			return nil, fmt.Errorf("error during boot: %s", err)230		}231	case <-time.After(q.timeout):232		// Kill the process, and wait for the goroutine above to terminate233		cmd.Process.Kill()234		<-errCh235		// Dump the boot log236		glog.Errorf(strings.Join(log, "\n"))237		return nil, fmt.Errorf("timeout waiting for boot")238	}239	glog.Info("Instance started.")240	// Detach from the child, since we will never wait on it241	cmd.Process.Release()242	return &SSHConnector{Host: "localhost", Port: port, Key: sshid}, nil243}244// IsRunning checks if the qemu process is alive245func (q *QemuLauncher) IsRunning() (bool, error) {246	if q.Pid == 0 {247		return false, nil248	}249	if err := CreateProcess("ps", "-p", strconv.Itoa(q.Pid)); err != nil {250		if cmderr, ok := err.(*exec.ExitError); ok && cmderr.ExitCode() == 1 {251			return false, nil252		}253		return false, fmt.Errorf("error running ps: %s", err)254	}255	return true, nil256}257// Cleans up any temporary files used by the launcher258func (q *QemuLauncher) cleanup() {259	if q.TmpDir != "" {260		if err := os.RemoveAll(q.TmpDir); err != nil {261			glog.Warningf("failed to remove temp dir: %s", err)262		}263		q.TmpDir = ""264	}265}266// Kill tells the QEMU process to terminate, and cleans up the TmpDir267func (q *QemuLauncher) Kill() error {268	if q.Pid != 0 {269		glog.Infof("Killing PID %d", q.Pid)270		// TODO(fxbug.dev/45431): More gracefully, with timeout271		if err := syscall.Kill(q.Pid, syscall.SIGKILL); err != nil {272			glog.Warningf("failed to kill instance: %s", err)273		}274		q.Pid = 0275	}276	q.cleanup()277	return nil278}279func loadLauncherFromHandle(build Build, handle Handle) (Launcher, error) {280	handleData, err := handle.GetData()281	if err != nil {282		return nil, err283	}284	// Check that the Launcher is in a valid state285	switch launcher := handleData.launcher.(type) {...

launcher_test.go

Source:launcher_test.go

...75	g := setup(t)76	defaults.Proxy = "test.com"77	defer func() { defaults.ResetWith("") }()78	l := launcher.New()79	defer l.Kill()80	u := l.MustLaunch()81	g.Regex(`\Aws://.+\z`, u)82	parsed, _ := url.Parse(u)83	{ // test GetWebSocketDebuggerURL84		for _, prefix := range []string{"", ":", "127.0.0.1:", "ws://127.0.0.1:"} {85			u2 := launcher.MustResolveURL(prefix + parsed.Port())86			g.Regex(u, u2)87		}88		_, err := launcher.ResolveURL("")89		g.Err(err)90	}91	{92		_, err := launcher.NewManaged("")93		g.Err(err)94		_, err = launcher.NewManaged("1://")95		g.Err(err)96		_, err = launcher.NewManaged("ws://not-exists")97		g.Err(err)98	}99	{100		g.Panic(func() { launcher.New().Set("a=b") })101	}102}103func TestLaunchUserMode(t *testing.T) {104	g := setup(t)105	l := launcher.NewUserMode()106	defer l.Kill()107	l.Kill() // empty kill should do nothing108	has := l.Has("not-exists")109	g.False(has)110	l.Append("test-append", "a")111	f := l.Get("test-append")112	g.Eq("a", f)113	dir := l.Get(flags.UserDataDir)114	port := 58472115	l = l.Context(g.Context()).Delete("test").Bin("").116		Revision(launcher.RevisionDefault).117		Logger(ioutil.Discard).118		Leakless(false).Leakless(true).119		Headless(false).Headless(true).RemoteDebuggingPort(port).120		NoSandbox(true).NoSandbox(false).121		Devtools(true).Devtools(false).122		StartURL("about:blank").123		Proxy("test.com").124		UserDataDir("test").UserDataDir(dir).125		WorkingDir("").126		Env(append(os.Environ(), "TZ=Asia/Tokyo")...)127	g.Eq(l.FormatArgs(), []string /* len=6 cap=8 */ {128		"--headless",129		`--no-startup-window`,           /* len=19 */130		`--proxy-server=test.com`,       /* len=23 */131		`--remote-debugging-port=58472`, /* len=29 */132		"--test-append=a",133		"about:blank",134	})135	url := l.MustLaunch()136	g.Eq(url, launcher.NewUserMode().RemoteDebuggingPort(port).MustLaunch())137}138func TestUserModeErr(t *testing.T) {139	g := setup(t)140	_, err := launcher.NewUserMode().RemoteDebuggingPort(48277).Bin("not-exists").Launch()141	g.Err(err)142	_, err = launcher.NewUserMode().RemoteDebuggingPort(58217).Bin("echo").Launch()143	g.Err(err)144}145func TestAppMode(t *testing.T) {146	g := setup(t)147	l := launcher.NewAppMode("http://example.com")148	g.Eq(l.Get(flags.App), "http://example.com")149}150func TestGetWebSocketDebuggerURLErr(t *testing.T) {151	g := setup(t)152	_, err := launcher.ResolveURL("1://")153	g.Err(err)154}155func TestLaunchErr(t *testing.T) {156	g := setup(t)157	g.Panic(func() {158		launcher.New().Bin("not-exists").MustLaunch()159	})160	g.Panic(func() {161		launcher.New().Headless(false).Bin("not-exists").MustLaunch()162	})163	g.Panic(func() {164		launcher.New().ClientHeader()165	})166	{167		l := launcher.New().XVFB()168		_, _ = l.Launch()169		l.Kill()170	}171}172func newBrowser() (*launcher.Browser, func()) {173	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)174	b := launcher.NewBrowser()175	if !testing.Verbose() {176		b.Logger = utils.LoggerQuiet177	}178	b.Context = ctx179	return b, cancel180}181var testProfileDir = flag.Bool("test-profile-dir", false, "set it to test profile dir")182func TestProfileDir(t *testing.T) {183	g := setup(t)...

manager.go

Source:manager.go

...155	httputil.NewSingleHostReverseProxy(toHTTP(*parsedURL)).ServeHTTP(w, r)156}157func (m *Manager) cleanup(l *Launcher, kill bool) {158	if kill {159		l.Kill()160		m.Logger.Println("Killed PID:", l.PID())161	}162	if !l.Has(flags.KeepUserDataDir) {163		l.Cleanup()164		dir := l.Get(flags.UserDataDir)165		m.Logger.Println("Removed", dir)166	}167}...

Kill

Using AI Code Generation

1import (2func main() {3	cmd := exec.Command("ls")4	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}5	err := cmd.Start()6	if err != nil {7		fmt.Println("Error starting process: ", err)8	}9	fmt.Printf("The process id is %v10	err = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)11	if err != nil {12		fmt.Println("Error killing process: ", err)13	}14}

Kill

Using AI Code Generation

1import (2func main() {3    cmd := exec.Command("notepad.exe")4    err := cmd.Start()5    if err != nil {6        fmt.Println("Error while launching notepad")7        fmt.Println(err)8    }9    err = cmd.Process.Kill()10    if err != nil {11        fmt.Println("Error while killing notepad")12        fmt.Println(err)13    }14    fmt.Println("Notepad killed successfully")15}16Related Posts: Golang - exec.Command() example17Golang - exec.CommandContext() example

Kill

Using AI Code Generation

1import (2func main() {3	cmd := exec.Command("ls")4	if err := cmd.Start(); err != nil {5		fmt.Println("Error starting process: ", err)6	}7	fmt.Println("Process id of ls command is: ", cmd.Process.Pid)8	err := syscall.Kill(cmd.Process.Pid, syscall.SIGKILL)9	if err != nil {10		fmt.Println("Error killing process: ", err)11	}12	fmt.Println("Process killed")13}

Kill

Using AI Code Generation

1import (2func main() {3    cmd := exec.Command("ls", "-l")4    cmd.Start()5    cmd.Wait()6    err := cmd.Process.Kill()7    if err != nil {8        fmt.Println("Process already finished")9    } else {10        fmt.Println("Process killed")11    }12}13import (14func main() {15    cmd := exec.Command("ls", "-l")16    cmd.Start()17    cmd.Wait()18    err := cmd.Process.Signal(os.Interrupt)19    if err != nil {20        fmt.Println("Process already finished")21    } else {22        fmt.Println("Process killed")23    }24}25import (26func main() {27    cmd := exec.Command("ls", "-l")28    cmd.Start()29    cmd.Wait()30    err := cmd.Process.Release()31    if err != nil {32        fmt.Println("Process already finished")33    } else {34        fmt.Println("Process killed")35    }36}

Kill

Using AI Code Generation

1import (2func main() {3    fmt.Println("Hello World")4    cmd := exec.Command("java", "launcher")5    cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}6    cmd.Start()7    time.Sleep(3 * time.Second)8    syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)9}10import java.io.IOException;11public class launcher {12    public static void main(String[] args) throws IOException {13        Process p = Runtime.getRuntime().exec("java child");14    }15}16public class child {17    public static void main(String[] args) {18        System.out.println("Hello World");19    }20}

Kill

Using AI Code Generation

1import (2func main() {3	launcher.Kill()4}5import (6func Kill() {7	cmd := exec.Command("notepad.exe")8	cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}9	cmd.Start()10	process, err := os.FindProcess(pid)11	if err != nil {12		panic(err)13	}14	process.Kill()15}16import (17func main() {18	launcher.Kill()19}

Kill

Using AI Code Generation

1import (2func main() {3    cmd := exec.Command("C:\\Users\\abc\\Desktop\\launcher.exe")4    err := cmd.Start()5    if err != nil {6        fmt.Println(err)7    }8    fmt.Println("Waiting for command to finish...")9    err = cmd.Wait()10    fmt.Println("Command finished with error: %v", err)11    time.Sleep(5 * time.Second)12    fmt.Println("Killing the process")13    cmd.Process.Kill()14    fmt.Println("Process killed")15    time.Sleep(5 * time.Second)16    fmt.Println("Starting the process again")17    cmd = exec.Command("C:\\Users\\abc\\Desktop\\launcher.exe")18    err = cmd.Start()19    if err != nil {20        fmt.Println(err)21    }22    fmt.Println("Waiting for command to finish...")23    err = cmd.Wait()24    fmt.Println("Command finished with error: %v", err)25    time.Sleep(5 * time.Second)26    os.Exit(0)27}28import (29func main() {30    cmd := exec.Command("C:\\Users\\abc\\Desktop\\launcher.exe")31    err := cmd.Start()32    if err != nil {33        fmt.Println(err)34    }35    fmt.Println("Waiting for command to finish...")36    err = cmd.Wait()37    fmt.Println("Command finished with error: %v", err)38    time.Sleep(5 * time.Second)39    fmt.Println("Killing the process")40    cmd.Process.Kill()41    fmt.Println("Process killed")42    time.Sleep(5 * time.Second)

Kill

Using AI Code Generation

1import (2func main() {3	fmt.Println("Executing the command")4	cmd := exec.Command("cmd.exe", "/C", "start", "notepad.exe")5	cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}6	cmd.Start()7	fmt.Println("Press any key to kill the process")8	bufio.NewReader(os.Stdin).ReadBytes('\n')9	cmd.Process.Kill()10}

Kill

Using AI Code Generation

1import (2func main() {3 launch := launcher.NewLauncher()4 launch.Kill()5 fmt.Println("Killed")6}

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