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// Copyright 2018 Google LLC
//
// 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 unimpl contains interface to emit events about unimplemented
// features.
package unimpl
import (
"gvisor.googlesource.com/gvisor/pkg/log"
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
)
// contextID is the events package's type for context.Context.Value keys.
type contextID int
const (
// CtxEvents is a Context.Value key for a Events.
CtxEvents contextID = iota
)
// Events interface defines method to emit unsupported events.
type Events interface {
EmitUnimplementedEvent(context.Context)
}
// EmitUnimplementedEvent emits unsupported syscall event to the context.
func EmitUnimplementedEvent(ctx context.Context) {
e := ctx.Value(CtxEvents)
if e == nil {
log.Warningf("Context.Value(CtxEvents) not present, unimplemented syscall event not reported.")
return
}
e.(Events).EmitUnimplementedEvent(ctx)
}
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