125 lines
3.3 KiB
Go
125 lines
3.3 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package command
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import (
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"context"
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"fmt"
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"os"
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"strings"
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"unsafe"
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"github.com/Microsoft/go-winio/pkg/etw"
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"github.com/Microsoft/go-winio/pkg/etwlogrus"
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"github.com/Microsoft/go-winio/pkg/guid"
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"github.com/containerd/containerd/log"
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"github.com/containerd/containerd/services/server"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/windows"
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)
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var (
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handledSignals = []os.Signal{
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windows.SIGTERM,
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windows.SIGINT,
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}
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)
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func handleSignals(ctx context.Context, signals chan os.Signal, serverC chan *server.Server, cancel func()) chan struct{} {
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done := make(chan struct{})
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go func() {
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var server *server.Server
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for {
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select {
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case s := <-serverC:
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server = s
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case s := <-signals:
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log.G(ctx).WithField("signal", s).Debug("received signal")
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if err := notifyStopping(ctx); err != nil {
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log.G(ctx).WithError(err).Error("notify stopping failed")
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}
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cancel()
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if server != nil {
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server.Stop()
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}
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close(done)
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return
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}
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}
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}()
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setupDumpStacks()
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return done
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}
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func setupDumpStacks() {
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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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// signaled. ACL'd to builtin administrators and local system
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event := "Global\\stackdump-" + fmt.Sprint(os.Getpid())
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ev, _ := windows.UTF16PtrFromString(event)
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sd, err := windows.SecurityDescriptorFromString("D:P(A;;GA;;;BA)(A;;GA;;;SY)")
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if err != nil {
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log.L.Errorf("failed to get security descriptor for debug stackdump event %s: %s", event, err.Error())
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return
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}
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var sa windows.SecurityAttributes
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sa.Length = uint32(unsafe.Sizeof(sa))
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sa.InheritHandle = 1
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sa.SecurityDescriptor = sd
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h, err := windows.CreateEvent(&sa, 0, 0, ev)
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if h == 0 || err != nil {
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log.L.Errorf("failed to create debug stackdump event %s: %s", event, err.Error())
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return
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}
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go func() {
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log.L.Debugf("Stackdump - waiting signal at %s", event)
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for {
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windows.WaitForSingleObject(h, windows.INFINITE)
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dumpStacks(true)
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}
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}()
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}
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func etwCallback(sourceID guid.GUID, state etw.ProviderState, level etw.Level, matchAnyKeyword uint64, matchAllKeyword uint64, filterData uintptr) {
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if state == etw.ProviderStateCaptureState {
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dumpStacks(false)
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}
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}
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func init() {
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// Provider ID: 2acb92c0-eb9b-571a-69cf-8f3410f383ad
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// Provider and hook aren't closed explicitly, as they will exist until
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// process exit. GUID is generated based on name - see
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// Microsoft/go-winio/tools/etw-provider-gen.
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provider, err := etw.NewProvider("ContainerD", etwCallback)
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if err != nil {
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log.L.Error(err)
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} else {
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if hook, err := etwlogrus.NewHookFromProvider(provider); err == nil {
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logrus.AddHook(hook)
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} else {
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log.L.Error(err)
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}
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}
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}
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func isLocalAddress(path string) bool {
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return strings.HasPrefix(path, `\\.\pipe\`)
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}
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