Golang syscall.Sethostname函数代码示例

func setupHostname(args *DockerInitArgs) error {
	hostname := getEnv(args, "HOSTNAME")
	if hostname == "" {
		return nil
	}
	return syscall.Sethostname([]byte(hostname))
}

func setupHostname(c *Config) error {
	hostname := c.Env["HOSTNAME"]
	if hostname == "" {
		return nil
	}
	return syscall.Sethostname([]byte(hostname))
}

// SetHostname sets both the kernel hostname and /etc/hostname to the specified string
func (t *BaseOperations) SetHostname(hostname string, aliases ...string) error {
	defer trace.End(trace.Begin("setting hostname to " + hostname))

	old, err := os.Hostname()
	if err != nil {
		log.Warnf("Unable to get current hostname - will not be able to revert on failure: %s", err)
	}

	err = syscall.Sethostname([]byte(hostname))
	if err != nil {
		log.Errorf("Unable to set hostname: %s", err)
		return err
	}
	log.Debugf("Updated kernel hostname")

	// update /etc/hostname to match
	err = ioutil.WriteFile(hostnameFile, []byte(hostname), 0644)
	if err != nil {
		log.Errorf("Failed to update hostname in %s", hostnameFile)

		// revert the hostname
		if old != "" {
			log.Warnf("Reverting kernel hostname to %s", old)
			err2 := syscall.Sethostname([]byte(old))
			if err2 != nil {
				log.Errorf("Unable to revert kernel hostname - kernel and hostname file are out of sync! Error: %s", err2)
			}
		}

		return err
	}

	// add entry to hosts for resolution without nameservers
	lo4 := net.IPv4(127, 0, 1, 1)
	for _, a := range append(aliases, hostname) {
		t.hosts.SetHost(a, lo4)
	}
	if err = t.hosts.Save(); err != nil {
		return err
	}

	return nil
}

// configureHostname calls to set the hostname to the one provided via
// configuration.
func (r *runner) configureHostname() error {
	if r.config.Hostname == "" {
		return nil
	}

	r.log.Infof("Setting hostname: %s", r.config.Hostname)
	if err := syscall.Sethostname([]byte(r.config.Hostname)); err != nil {
		r.log.Errorf("- Failed to set hostname: %v", err)
	}
	return nil
}

func setup(cfg Cfg) error {
	if err := mount(cfg); err != nil {
		return err
	}
	if err := pivotRoot(cfg.Rootfs); err != nil {
		return fmt.Errorf("Pivot root error: %v", err)
	}
	if err := syscall.Sethostname([]byte(cfg.Hostname)); err != nil {
		return fmt.Errorf("Sethostname: %v", err)
	}
	return nil
}

/*   setup() is tasked with running the setup code from within the namespace,
 * before the target executable is invoked. It is designed to only execute the
 * correct hooks for the features the namespace was created with.
 */
func setup() error {
	// Read in container environment variables.
	nsId, _ := syscall.Getenv("LXNS_ID")

	// Read in container configuration.
	config, e := GetConfig(os.NewFile(3, "-"))
	if e != nil {
		return fmt.Errorf("Failed to import configuration: %v", e)
	}

	// Create a key set to check flags against.
	nsCloneFlags := make(map[string]struct{})
	for _, v := range config.Features {
		nsCloneFlags[v] = empty
	}

	// Do we have networking namespace?
	if _, ok := nsCloneFlags["net"]; ok {
		if e := SetupNetwork(config.NetworkAddr); e != nil {
			return e
		}
	}

	// Do we have mounting namespace?
	if _, ok := nsCloneFlags["ns"]; ok {
		// If we have PID namespace, then mount /proc
		if _, ok := nsCloneFlags["pid"]; ok {
			if e := syscall.Mount("proc", "/proc", "proc",
				syscall.MS_NOEXEC|syscall.MS_NOSUID|syscall.MS_NODEV,
				""); e != nil {
				return fmt.Errorf("Failed to mount proc: %v", e)
			}
		}

		// Change our root filesystem using pivot_root syscall
		if len(config.RootFS) > 0 {
			PivotRoot(config.RootFS)
		}
	}

	// Do we have hostname namespace?
	if _, ok := nsCloneFlags["uts"]; ok {
		hostname := fmt.Sprintf("lxns-%s", nsId)
		if e := syscall.Sethostname([]byte(hostname)); e != nil {
			return e
		}
	}
	return nil
}

func SetHostname(cc *rancherConfig.CloudConfig) (string, error) {
	name, _ := os.Hostname()
	if cc.Hostname != "" {
		name = cc.Hostname
	}
	if name != "" {
		//set hostname
		if err := syscall.Sethostname([]byte(name)); err != nil {
			log.WithFields(log.Fields{"err": err, "hostname": name}).Error("Error setting hostname")
			return "", err
		}
	}

	return name, nil
}

func SetHostnameFromCloudConfig(cc *config.CloudConfig) error {
	var hostname string
	if cc.Hostname == "" {
		hostname = cc.DefaultHostname
	} else {
		hostname = cc.Hostname
	}

	if hostname == "" {
		return nil
	}

	// set hostname
	if err := syscall.Sethostname([]byte(hostname)); err != nil {
		return err
	}

	return nil
}

func (st *initState) runInit() {
	st.log.Info("Starting oz-init for profile: %s", st.profile.Name)
	sigs := make(chan os.Signal)
	signal.Notify(sigs, syscall.SIGTERM, os.Interrupt)

	s, err := ipc.NewServer(st.sockaddr, messageFactory, st.log,
		handlePing,
		st.handleRunProgram,
		st.handleRunShell,
	)
	if err != nil {
		st.log.Error("NewServer failed: %v", err)
		os.Exit(1)
	}

	if err := os.Chown(st.sockaddr, int(st.uid), int(st.gid)); err != nil {
		st.log.Warning("Failed to chown oz-init control socket: %v", err)
	}

	if err := st.setupFilesystem(nil); err != nil {
		st.log.Error("Failed to setup filesytem: %v", err)
		os.Exit(1)
	}

	if st.user != nil && st.user.HomeDir != "" {
		st.launchEnv = append(st.launchEnv, "HOME="+st.user.HomeDir)
	}

	if st.profile.Networking.Nettype != network.TYPE_HOST {
		err := network.NetSetup(st.network)
		if err != nil {
			st.log.Error("Unable to setup networking: %+v", err)
			os.Exit(1)
		}
	}
	network.NetPrint(st.log)

	if syscall.Sethostname([]byte(st.profile.Name)) != nil {
		st.log.Error("Failed to set hostname to (%s)", st.profile.Name)
		os.Exit(1)
	}
	if syscall.Setdomainname([]byte("local")) != nil {
		st.log.Error("Failed to set domainname")
	}
	st.log.Info("Hostname set to (%s.local)", st.profile.Name)

	if err := st.setupDbus(); err != nil {
		st.log.Error("Unable to setup dbus: %v", err)
		os.Exit(1)
	}

	oz.ReapChildProcs(st.log, st.handleChildExit)

	if st.profile.XServer.Enabled {
		st.xpraReady.Add(1)
		st.startXpraServer()
	}
	st.xpraReady.Wait()
	st.log.Info("XPRA started")

	if st.needsDbus() {
		if err := st.getDbusSession(); err != nil {
			st.log.Error("Unable to get dbus session information: %v", err)
			os.Exit(1)
		}
	}

	fsbx := path.Join("/tmp", "oz-sandbox")
	err = ioutil.WriteFile(fsbx, []byte(st.profile.Name), 0644)

	// Signal the daemon we are ready
	os.Stderr.WriteString("OK\n")

	go st.processSignals(sigs, s)

	st.ipcServer = s

	if err := s.Run(); err != nil {
		st.log.Warning("MsgServer.Run() return err: %v", err)
	}
	st.log.Info("oz-init exiting...")
}

func (l *linuxStandardInit) Init() error {
	ringname, keepperms, newperms := l.getSessionRingParams()

	// do not inherit the parent's session keyring
	sessKeyId, err := keyctl.JoinSessionKeyring(ringname)
	if err != nil {
		return err
	}
	// make session keyring searcheable
	if err := keyctl.ModKeyringPerm(sessKeyId, keepperms, newperms); err != nil {
		return err
	}

	var console *linuxConsole
	if l.config.Console != "" {
		console = newConsoleFromPath(l.config.Console)
		if err := console.dupStdio(); err != nil {
			return err
		}
	}
	if console != nil {
		if err := system.Setctty(); err != nil {
			return err
		}
	}
	if err := setupNetwork(l.config); err != nil {
		return err
	}
	if err := setupRoute(l.config.Config); err != nil {
		return err
	}

	label.Init()
	// InitializeMountNamespace() can be executed only for a new mount namespace
	if l.config.Config.Namespaces.Contains(configs.NEWNS) {
		if err := setupRootfs(l.config.Config, console, l.pipe); err != nil {
			return err
		}
	}
	if hostname := l.config.Config.Hostname; hostname != "" {
		if err := syscall.Sethostname([]byte(hostname)); err != nil {
			return err
		}
	}
	if err := apparmor.ApplyProfile(l.config.AppArmorProfile); err != nil {
		return err
	}
	if err := label.SetProcessLabel(l.config.ProcessLabel); err != nil {
		return err
	}

	for key, value := range l.config.Config.Sysctl {
		if err := writeSystemProperty(key, value); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.ReadonlyPaths {
		if err := remountReadonly(path); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.MaskPaths {
		if err := maskFile(path); err != nil {
			return err
		}
	}
	pdeath, err := system.GetParentDeathSignal()
	if err != nil {
		return err
	}
	if l.config.NoNewPrivileges {
		if err := system.Prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); err != nil {
			return err
		}
	}
	// Tell our parent that we're ready to Execv. This must be done before the
	// Seccomp rules have been applied, because we need to be able to read and
	// write to a socket.
	if err := syncParentReady(l.pipe); err != nil {
		return err
	}
	// Without NoNewPrivileges seccomp is a privileged operation, so we need to
	// do this before dropping capabilities; otherwise do it as late as possible
	// just before execve so as few syscalls take place after it as possible.
	if l.config.Config.Seccomp != nil && !l.config.NoNewPrivileges {
		if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
			return err
		}
	}
	if err := finalizeNamespace(l.config); err != nil {
		return err
	}
	// finalizeNamespace can change user/group which clears the parent death
	// signal, so we restore it here.
	if err := pdeath.Restore(); err != nil {
		return err
	}
	// compare the parent from the inital start of the init process and make sure that it did not change.
	// if the parent changes that means it died and we were reparened to something else so we should
	// just kill ourself and not cause problems for someone else.
//.........这里部分代码省略.........

func (l *linuxStandardInit) Init() error {
	// do not inherit the parent's session keyring
	sessKeyId, err := keyctl.JoinSessionKeyring("")
	if err != nil {
		return err
	}
	// make session keyring searcheable
	// without user ns we need 'UID' search permissions
	// with user ns we need 'other' search permissions
	if err := keyctl.ModKeyringPerm(sessKeyId, 0xffffffff, 0x080008); err != nil {
		return err
	}

	// join any namespaces via a path to the namespace fd if provided
	if err := joinExistingNamespaces(l.config.Config.Namespaces); err != nil {
		return err
	}
	var console *linuxConsole
	if l.config.Console != "" {
		console = newConsoleFromPath(l.config.Console)
		if err := console.dupStdio(); err != nil {
			return err
		}
	}
	if _, err := syscall.Setsid(); err != nil {
		return err
	}
	if console != nil {
		if err := system.Setctty(); err != nil {
			return err
		}
	}
	if err := setupNetwork(l.config); err != nil {
		return err
	}
	if err := setupRoute(l.config.Config); err != nil {
		return err
	}
	if err := setupRlimits(l.config.Config); err != nil {
		return err
	}
	if err := setOomScoreAdj(l.config.Config.OomScoreAdj); err != nil {
		return err
	}
	label.Init()
	// InitializeMountNamespace() can be executed only for a new mount namespace
	if l.config.Config.Namespaces.Contains(configs.NEWNS) {
		if err := setupRootfs(l.config.Config, console); err != nil {
			return err
		}
	}
	if hostname := l.config.Config.Hostname; hostname != "" {
		if err := syscall.Sethostname([]byte(hostname)); err != nil {
			return err
		}
	}
	if err := apparmor.ApplyProfile(l.config.Config.AppArmorProfile); err != nil {
		return err
	}
	if err := label.SetProcessLabel(l.config.Config.ProcessLabel); err != nil {
		return err
	}

	for key, value := range l.config.Config.Sysctl {
		if err := writeSystemProperty(key, value); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.ReadonlyPaths {
		if err := remountReadonly(path); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.MaskPaths {
		if err := maskFile(path); err != nil {
			return err
		}
	}
	pdeath, err := system.GetParentDeathSignal()
	if err != nil {
		return err
	}
	if l.config.Config.NoNewPrivileges {
		if err := system.Prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); err != nil {
			return err
		}
	}
	// Tell our parent that we're ready to Execv. This must be done before the
	// Seccomp rules have been applied, because we need to be able to read and
	// write to a socket.
	if err := syncParentReady(l.pipe); err != nil {
		return err
	}
	if l.config.Config.Seccomp != nil {
		if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
			return err
		}
	}
	if err := finalizeNamespace(l.config); err != nil {
		return err
//.........这里部分代码省略.........

func (l *linuxStandardInit) Init() error {
	// join any namespaces via a path to the namespace fd if provided
	if err := joinExistingNamespaces(l.config.Config.Namespaces); err != nil {
		return err
	}
	var console *linuxConsole
	if l.config.Console != "" {
		console = newConsoleFromPath(l.config.Console)
		if err := console.dupStdio(); err != nil {
			return err
		}
	}
	if _, err := syscall.Setsid(); err != nil {
		return err
	}
	if console != nil {
		if err := system.Setctty(); err != nil {
			return err
		}
	}
	if err := setupNetwork(l.config); err != nil {
		return err
	}
	if err := setupRoute(l.config.Config); err != nil {
		return err
	}
	if err := setupRlimits(l.config.Config); err != nil {
		return err
	}
	label.Init()
	// InitializeMountNamespace() can be executed only for a new mount namespace
	if l.config.Config.Namespaces.Contains(configs.NEWNS) {
		if err := setupRootfs(l.config.Config, console); err != nil {
			return err
		}
	}
	if hostname := l.config.Config.Hostname; hostname != "" {
		if err := syscall.Sethostname([]byte(hostname)); err != nil {
			return err
		}
	}
	if err := apparmor.ApplyProfile(l.config.Config.AppArmorProfile); err != nil {
		return err
	}
	if err := label.SetProcessLabel(l.config.Config.ProcessLabel); err != nil {
		return err
	}
	for _, path := range l.config.Config.ReadonlyPaths {
		if err := remountReadonly(path); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.MaskPaths {
		if err := maskFile(path); err != nil {
			return err
		}
	}
	pdeath, err := system.GetParentDeathSignal()
	if err != nil {
		return err
	}
	if err := finalizeNamespace(l.config); err != nil {
		return err
	}
	// finalizeNamespace can change user/group which clears the parent death
	// signal, so we restore it here.
	if err := pdeath.Restore(); err != nil {
		return err
	}
	// Signal self if parent is already dead. Does nothing if running in a new
	// PID namespace, as Getppid will always return 0.
	if syscall.Getppid() == 1 {
		return syscall.Kill(syscall.Getpid(), syscall.SIGKILL)
	}
	return system.Execv(l.config.Args[0], l.config.Args[0:], os.Environ())
}

func (l *linuxStandardInit) Init() error {
	// join any namespaces via a path to the namespace fd if provided
	if err := joinExistingNamespaces(l.config.Config.Namespaces); err != nil {
		return err
	}
	var console *linuxConsole
	if l.config.Console != "" {
		console = newConsoleFromPath(l.config.Console)
		if err := console.dupStdio(); err != nil {
			return err
		}
	}
	if _, err := syscall.Setsid(); err != nil {
		return err
	}
	if console != nil {
		if err := system.Setctty(); err != nil {
			return err
		}
	}
	if err := setupNetwork(l.config); err != nil {
		return err
	}
	if err := setupRoute(l.config.Config); err != nil {
		return err
	}
	if err := setupRlimits(l.config.Config); err != nil {
		return err
	}
	label.Init()
	// InitializeMountNamespace() can be executed only for a new mount namespace
	if l.config.Config.Namespaces.Contains(configs.NEWNS) {
		if err := setupRootfs(l.config.Config, console); err != nil {
			return err
		}
	}
	if hostname := l.config.Config.Hostname; hostname != "" {
		if err := syscall.Sethostname([]byte(hostname)); err != nil {
			return err
		}
	}
	if err := apparmor.ApplyProfile(l.config.Config.AppArmorProfile); err != nil {
		return err
	}
	if err := label.SetProcessLabel(l.config.Config.ProcessLabel); err != nil {
		return err
	}

	for key, value := range l.config.Config.Sysctl {
		if err := writeSystemProperty(key, value); err != nil {
			return err
		}
	}

	for _, path := range l.config.Config.ReadonlyPaths {
		if err := remountReadonly(path); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.MaskPaths {
		if err := maskFile(path); err != nil {
			return err
		}
	}
	pdeath, err := system.GetParentDeathSignal()
	if err != nil {
		return err
	}
	if l.config.Config.Seccomp != nil {
		if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
			return err
		}
	}
	if err := finalizeNamespace(l.config); err != nil {
		return err
	}
	// finalizeNamespace can change user/group which clears the parent death
	// signal, so we restore it here.
	if err := pdeath.Restore(); err != nil {
		return err
	}
	// compare the parent from the inital start of the init process and make sure that it did not change.
	// if the parent changes that means it died and we were reparened to something else so we should
	// just kill ourself and not cause problems for someone else.
	if syscall.Getppid() != l.parentPid {
		return syscall.Kill(syscall.Getpid(), syscall.SIGKILL)
	}
	return system.Execv(l.config.Args[0], l.config.Args[0:], os.Environ())
}

func (l *linuxStandardInit) Init() error {
	if !l.config.Config.NoNewKeyring {
		ringname, keepperms, newperms := l.getSessionRingParams()

		// do not inherit the parent's session keyring
		sessKeyId, err := keys.JoinSessionKeyring(ringname)
		if err != nil {
			return err
		}
		// make session keyring searcheable
		if err := keys.ModKeyringPerm(sessKeyId, keepperms, newperms); err != nil {
			return err
		}
	}

	if err := setupNetwork(l.config); err != nil {
		return err
	}
	if err := setupRoute(l.config.Config); err != nil {
		return err
	}

	label.Init()

	// prepareRootfs() can be executed only for a new mount namespace.
	if l.config.Config.Namespaces.Contains(configs.NEWNS) {
		if err := prepareRootfs(l.pipe, l.config.Config); err != nil {
			return err
		}
	}

	// Set up the console. This has to be done *before* we finalize the rootfs,
	// but *after* we've given the user the chance to set up all of the mounts
	// they wanted.
	if l.config.CreateConsole {
		if err := setupConsole(l.pipe, l.config, true); err != nil {
			return err
		}
		if err := system.Setctty(); err != nil {
			return err
		}
	}

	// Finish the rootfs setup.
	if l.config.Config.Namespaces.Contains(configs.NEWNS) {
		if err := finalizeRootfs(l.config.Config); err != nil {
			return err
		}
	}

	if hostname := l.config.Config.Hostname; hostname != "" {
		if err := syscall.Sethostname([]byte(hostname)); err != nil {
			return err
		}
	}
	if err := apparmor.ApplyProfile(l.config.AppArmorProfile); err != nil {
		return err
	}
	if err := label.SetProcessLabel(l.config.ProcessLabel); err != nil {
		return err
	}

	for key, value := range l.config.Config.Sysctl {
		if err := writeSystemProperty(key, value); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.ReadonlyPaths {
		if err := remountReadonly(path); err != nil {
			return err
		}
	}
	for _, path := range l.config.Config.MaskPaths {
		if err := maskPath(path); err != nil {
			return err
		}
	}
	pdeath, err := system.GetParentDeathSignal()
	if err != nil {
		return err
	}
	if l.config.NoNewPrivileges {
		if err := system.Prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); err != nil {
			return err
		}
	}
	// Tell our parent that we're ready to Execv. This must be done before the
	// Seccomp rules have been applied, because we need to be able to read and
	// write to a socket.
	if err := syncParentReady(l.pipe); err != nil {
		return err
	}
	// Without NoNewPrivileges seccomp is a privileged operation, so we need to
	// do this before dropping capabilities; otherwise do it as late as possible
	// just before execve so as few syscalls take place after it as possible.
	if l.config.Config.Seccomp != nil && !l.config.NoNewPrivileges {
		if err := seccomp.InitSeccomp(l.config.Config.Seccomp); err != nil {
			return err
		}
	}
//.........这里部分代码省略.........

// TODO(vishh): This is part of the libcontainer API and it does much more than just namespaces related work.
// Move this to libcontainer package.
// Init is the init process that first runs inside a new namespace to setup mounts, users, networking,
// and other options required for the new container.
// The caller of Init function has to ensure that the go runtime is locked to an OS thread
// (using runtime.LockOSThread) else system calls like setns called within Init may not work as intended.
func Init(container *libcontainer.Config, uncleanRootfs, consolePath string, syncPipe *syncpipe.SyncPipe, args []string) (err error) {
	defer func() {
		if err != nil {
			syncPipe.ReportChildError(err)
		}
	}()

	rootfs, err := utils.ResolveRootfs(uncleanRootfs)
	if err != nil {
		return err
	}

	// clear the current processes env and replace it with the environment
	// defined on the container
	if err := LoadContainerEnvironment(container); err != nil {
		return err
	}

	// We always read this as it is a way to sync with the parent as well
	var networkState *network.NetworkState
	if err := syncPipe.ReadFromParent(&networkState); err != nil {
		return err
	}

	if consolePath != "" {
		if err := console.OpenAndDup(consolePath); err != nil {
			return err
		}
	}
	if _, err := syscall.Setsid(); err != nil {
		return fmt.Errorf("setsid %s", err)
	}
	if consolePath != "" {
		if err := system.Setctty(); err != nil {
			return fmt.Errorf("setctty %s", err)
		}
	}
	if err := ipc.Initialize(container.IpcNsPath); err != nil {
		return fmt.Errorf("setup IPC %s", err)
	}
	if err := setupNetwork(container, networkState); err != nil {
		return fmt.Errorf("setup networking %s", err)
	}
	if err := setupRoute(container); err != nil {
		return fmt.Errorf("setup route %s", err)
	}

	label.Init()

	if err := mount.InitializeMountNamespace(rootfs,
		consolePath,
		container.RestrictSys,
		(*mount.MountConfig)(container.MountConfig)); err != nil {
		return fmt.Errorf("setup mount namespace %s", err)
	}

	if container.Hostname != "" {
		if err := syscall.Sethostname([]byte(container.Hostname)); err != nil {
			return fmt.Errorf("sethostname %s", err)
		}
	}

	if err := apparmor.ApplyProfile(container.AppArmorProfile); err != nil {
		return fmt.Errorf("set apparmor profile %s: %s", container.AppArmorProfile, err)
	}

	if err := label.SetProcessLabel(container.ProcessLabel); err != nil {
		return fmt.Errorf("set process label %s", err)
	}

	// TODO: (crosbymichael) make this configurable at the Config level
	if container.RestrictSys {
		if err := restrict.Restrict("proc/sys", "proc/sysrq-trigger", "proc/irq", "proc/bus"); err != nil {
			return err
		}
	}

	pdeathSignal, err := system.GetParentDeathSignal()
	if err != nil {
		return fmt.Errorf("get parent death signal %s", err)
	}

	if err := FinalizeNamespace(container); err != nil {
		return fmt.Errorf("finalize namespace %s", err)
	}

	// FinalizeNamespace can change user/group which clears the parent death
	// signal, so we restore it here.
	if err := RestoreParentDeathSignal(pdeathSignal); err != nil {
		return fmt.Errorf("restore parent death signal %s", err)
	}

	return system.Execv(args[0], args[0:], os.Environ())
}