1 files changed, 44 insertions, 0 deletions
diff --git a/pkg/sentry/kernel/time/context.go b/pkg/sentry/kernel/time/context.go
new file mode 100644
index 000000000..c0660d362
--- /dev/null
+++ b/pkg/sentry/kernel/time/context.go
@@ -0,0 +1,44 @@
+// 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 time
+
+import (
+	"gvisor.googlesource.com/gvisor/pkg/sentry/context"
+)
+
+// contextID is the time package's type for context.Context.Value keys.
+type contextID int
+
+const (
+	// CtxRealtimeClock is a Context.Value key for the current real time.
+	CtxRealtimeClock contextID = iota
+)
+
+// RealtimeClockFromContext returns the real time clock associated with context
+// ctx.
+func RealtimeClockFromContext(ctx context.Context) Clock {
+	if v := ctx.Value(CtxRealtimeClock); v != nil {
+		return v.(Clock)
+	}
+	return nil
+}
+
+// NowFromContext returns the current real time associated with context ctx.
+func NowFromContext(ctx context.Context) Time {
+	if clk := RealtimeClockFromContext(ctx); clk != nil {
+		return clk.Now()
+	}
+	panic("encountered context without RealtimeClock")
+}