Merge release-20210510.0-70-g2bed0bb09 (automated)

1 files changed, 36 insertions, 0 deletions

diff --git a/pkg/abi/linux/context.go b/pkg/abi/linux/context.go
new file mode 100644
index 000000000..d2dbba183
--- /dev/null
+++ b/pkg/abi/linux/context.go
@@ -0,0 +1,36 @@
+// Copyright 2021 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 linux
+
+import (
+	"gvisor.dev/gvisor/pkg/context"
+)
+
+// contextID is the linux package's type for context.Context.Value keys.
+type contextID int
+
+const (
+	// CtxSignalNoInfoFunc is a Context.Value key for a function to send signals.
+	CtxSignalNoInfoFunc contextID = iota
+)
+
+// SignalNoInfoFuncFromContext returns a callback function that can be used to send a
+// signal to the given context.
+func SignalNoInfoFuncFromContext(ctx context.Context) func(Signal) error {
+	if f := ctx.Value(CtxSignalNoInfoFunc); f != nil {
+		return f.(func(Signal) error)
+	}
+	return nil
+}