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// 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
}
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