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moby--moby/daemon/debugtrap_windows.go
John Howard 7d0dea1055 Fix startup logging
Signed-off-by: John Howard <jhoward@microsoft.com>
2017-10-19 11:09:29 -07:00

46 lines
1.4 KiB
Go

package daemon
import (
"fmt"
"os"
"unsafe"
winio "github.com/Microsoft/go-winio"
"github.com/docker/docker/pkg/signal"
"github.com/sirupsen/logrus"
"golang.org/x/sys/windows"
)
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
event := "Global\\docker-daemon-" + fmt.Sprint(os.Getpid())
ev, _ := windows.UTF16PtrFromString(event)
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", event, err.Error())
return
}
var sa windows.SecurityAttributes
sa.Length = uint32(unsafe.Sizeof(sa))
sa.InheritHandle = 1
sa.SecurityDescriptor = uintptr(unsafe.Pointer(&sd[0]))
h, err := windows.CreateEvent(&sa, 0, 0, ev)
if h == 0 || err != nil {
logrus.Errorf("failed to create debug stackdump event %s: %s", event, err.Error())
return
}
go func() {
logrus.Debugf("Stackdump - waiting signal at %s", event)
for {
windows.WaitForSingleObject(h, windows.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)
}
}
}()
}