| 49 | } |
| 50 | |
| 51 | func SetupSignalHandler() (<-chan struct{}, chan struct{}) { |
| 52 | stop := make(chan struct{}) |
| 53 | finishCh := make(chan struct{}) |
| 54 | sigc := make(chan os.Signal, 2048) |
| 55 | signal.Notify(sigc, syscall.SIGINT, syscall.SIGTERM, syscall.SIGCHLD) |
| 56 | var exit bool |
| 57 | go func() { |
| 58 | for { |
| 59 | select { |
| 60 | case <-finishCh: |
| 61 | exit = true |
| 62 | } |
| 63 | } |
| 64 | }() |
| 65 | go func() { |
| 66 | for { |
| 67 | s := <-sigc |
| 68 | logs.Debugf("got signal %s\n", s.String()) |
| 69 | switch s { |
| 70 | case syscall.SIGCHLD: |
| 71 | for { |
| 72 | var ws syscall.WaitStatus |
| 73 | var rus syscall.Rusage |
| 74 | pid, err := syscall.Wait4(-1, &ws, syscall.WNOHANG, &rus) |
| 75 | if err != nil { |
| 76 | if err == syscall.EINTR { |
| 77 | continue |
| 78 | } |
| 79 | if err != syscall.ECHILD { |
| 80 | logs.Errorf("wait process err %s ", err) |
| 81 | } |
| 82 | break |
| 83 | } |
| 84 | if pid <= 0 { |
| 85 | break |
| 86 | } |
| 87 | logs.V(6).Infof("child pid %d exits\n", pid) |
| 88 | } |
| 89 | case syscall.SIGINT, syscall.SIGTERM: |
| 90 | if !exit { |
| 91 | close(stop) |
| 92 | // grace shutdown timeout with 10 min |
| 93 | timer := time.NewTimer(10 * time.Minute) |
| 94 | go func() { |
| 95 | select { |
| 96 | case <-timer.C: |
| 97 | exit = true |
| 98 | } |
| 99 | }() |
| 100 | } else { |
| 101 | os.Exit(1) |
| 102 | } |
| 103 | } |
| 104 | } |
| 105 | }() |
| 106 | |
| 107 | return stop, finishCh |
| 108 | } |