2015-07-06 21:58:53 -04:00
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package daemon
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import (
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"fmt"
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"os"
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2016-10-13 20:00:58 -04:00
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"unsafe"
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2015-07-06 21:58:53 -04:00
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2016-10-13 20:00:58 -04:00
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winio "github.com/Microsoft/go-winio"
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2016-03-27 20:23:34 -04:00
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"github.com/docker/docker/pkg/signal"
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2017-07-26 17:42:13 -04:00
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"github.com/sirupsen/logrus"
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2017-05-23 10:22:32 -04:00
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"golang.org/x/sys/windows"
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2015-07-06 21:58:53 -04:00
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)
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2016-10-12 18:29:47 -04:00
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func (d *Daemon) setupDumpStackTrap(root string) {
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2015-07-06 21:58:53 -04:00
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// Windows does not support signals like *nix systems. So instead of
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// trapping on SIGUSR1 to dump stacks, we wait on a Win32 event to be
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2016-10-13 20:00:58 -04:00
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// signaled. ACL'd to builtin administrators and local system
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2017-08-21 06:58:09 -04:00
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ev, _ := windows.UTF16PtrFromString("Global\\docker-daemon-" + fmt.Sprint(os.Getpid()))
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2016-10-13 20:00:58 -04:00
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sd, err := winio.SddlToSecurityDescriptor("D:P(A;;GA;;;BA)(A;;GA;;;SY)")
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if err != nil {
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logrus.Errorf("failed to get security descriptor for debug stackdump event %s: %s", ev, err.Error())
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return
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}
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2017-05-23 10:22:32 -04:00
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var sa windows.SecurityAttributes
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2016-10-13 20:00:58 -04:00
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sa.Length = uint32(unsafe.Sizeof(sa))
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sa.InheritHandle = 1
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sa.SecurityDescriptor = uintptr(unsafe.Pointer(&sd[0]))
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2017-08-21 06:58:09 -04:00
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h, err := windows.CreateEvent(&sa, 0, 0, ev)
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2016-10-13 20:00:58 -04:00
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if h == 0 || err != nil {
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logrus.Errorf("failed to create debug stackdump event %s: %s", ev, err.Error())
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return
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}
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2015-07-06 21:58:53 -04:00
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go func() {
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2016-10-13 20:00:58 -04:00
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logrus.Debugf("Stackdump - waiting signal at %s", ev)
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for {
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2017-05-23 10:22:32 -04:00
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windows.WaitForSingleObject(h, windows.INFINITE)
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2016-11-01 10:32:55 -04:00
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path, err := signal.DumpStacks(root)
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if err != nil {
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logrus.WithError(err).Error("failed to write goroutines dump")
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2016-10-12 18:29:47 -04:00
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} else {
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logrus.Infof("goroutine stacks written to %s", path)
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}
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2015-07-06 21:58:53 -04:00
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}
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}()
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}
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