1 files changed, 42 insertions, 0 deletions
diff --git a/pkg/sentry/kernel/pipe/reader.go b/pkg/sentry/kernel/pipe/reader.go
new file mode 100644
index 000000000..656be824d
--- /dev/null
+++ b/pkg/sentry/kernel/pipe/reader.go
@@ -0,0 +1,42 @@
+// Copyright 2018 The gVisor Authors.
+//
+// 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 pipe
+
+import (
+	"gvisor.googlesource.com/gvisor/pkg/waiter"
+)
+
+// Reader satisfies the fs.FileOperations interface for read-only pipes.
+// Reader should be used with !fs.FileFlags.Write to reject writes.
+//
+// +stateify savable
+type Reader struct {
+	ReaderWriter
+}
+
+// Release implements fs.FileOperations.Release.
+//
+// This overrides ReaderWriter.Release.
+func (r *Reader) Release() {
+	r.Pipe.rClose()
+
+	// Wake up writers.
+	r.Pipe.Notify(waiter.EventOut)
+}
+
+// Readiness returns the ready events in the underlying pipe.
+func (r *Reader) Readiness(mask waiter.EventMask) waiter.EventMask {
+	return r.Pipe.rReadiness() & mask
+}