1 files changed, 39 insertions, 0 deletions
diff --git a/pkg/sentry/fs/host/socket_state.go b/pkg/sentry/fs/host/socket_state.go
new file mode 100644
index 000000000..6acabd55a
--- /dev/null
+++ b/pkg/sentry/fs/host/socket_state.go
@@ -0,0 +1,39 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package host
+
+import (
+	"fmt"
+	"syscall"
+)
+
+// beforeSave is invoked by stateify.
+func (ep *endpoint) beforeSave() {
+	if ep.srfd < 0 {
+		panic("only host file descriptors provided at sentry startup can be saved")
+	}
+}
+
+// afterLoad is invoked by stateify.
+func (ep *endpoint) afterLoad() {
+	fd, err := syscall.Dup(ep.srfd)
+	if err != nil {
+		panic(fmt.Sprintf("failed to dup restored fd %d: %v", ep.srfd, err))
+	}
+	ep.fd = fd
+	if err := ep.init(); err != nil {
+		panic(fmt.Sprintf("Could not restore host socket fd %d: %v", ep.srfd, err))
+	}
+}