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// Copyright 2023 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 shm
import (
"gvisor.dev/gvisor/pkg/context"
)
type contextID int
const (
// CtxDeviceID is a Context.Value key for kernel.Kernel.sysVShmDevID, which
// this package cannot refer to due to dependency cycles.
CtxDeviceID contextID = iota
)
func deviceIDFromContext(ctx context.Context) (uint32, bool) {
v := ctx.Value(CtxDeviceID)
if v == nil {
return 0, false
}
return v.(uint32), true
}
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