| package daemon |
| |
| import ( |
| "fmt" |
| "os" |
| "syscall" |
| "unsafe" |
| |
| winio "github.com/Microsoft/go-winio" |
| "github.com/Sirupsen/logrus" |
| "github.com/docker/docker/pkg/signal" |
| "github.com/docker/docker/pkg/system" |
| ) |
| |
| func (d *Daemon) setupDumpStackTrap(root string) { |
| // Windows does not support signals like *nix systems. So instead of |
| // trapping on SIGUSR1 to dump stacks, we wait on a Win32 event to be |
| // signaled. ACL'd to builtin administrators and local system |
| ev := "Global\\docker-daemon-" + fmt.Sprint(os.Getpid()) |
| sd, err := winio.SddlToSecurityDescriptor("D:P(A;;GA;;;BA)(A;;GA;;;SY)") |
| if err != nil { |
| logrus.Errorf("failed to get security descriptor for debug stackdump event %s: %s", ev, err.Error()) |
| return |
| } |
| var sa syscall.SecurityAttributes |
| sa.Length = uint32(unsafe.Sizeof(sa)) |
| sa.InheritHandle = 1 |
| sa.SecurityDescriptor = uintptr(unsafe.Pointer(&sd[0])) |
| h, err := system.CreateEvent(&sa, false, false, ev) |
| if h == 0 || err != nil { |
| logrus.Errorf("failed to create debug stackdump event %s: %s", ev, err.Error()) |
| return |
| } |
| go func() { |
| logrus.Debugf("Stackdump - waiting signal at %s", ev) |
| for { |
| syscall.WaitForSingleObject(h, syscall.INFINITE) |
| path, err := signal.DumpStacks(root) |
| if err != nil { |
| logrus.WithError(err).Error("failed to write goroutines dump") |
| } else { |
| logrus.Infof("goroutine stacks written to %s", path) |
| } |
| path, err = d.dumpDaemon(root) |
| if err != nil { |
| logrus.WithError(err).Error("failed to write daemon datastructure dump") |
| } else { |
| logrus.Infof("daemon datastructure dump written to %s", path) |
| } |
| } |
| }() |
| } |
