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// 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 kernel
import (
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/sentry/kernel/msgqueue"
"gvisor.dev/gvisor/pkg/sentry/kernel/semaphore"
"gvisor.dev/gvisor/pkg/sentry/kernel/shm"
)
// IPCNamespace represents an IPC namespace.
//
// +stateify savable
type IPCNamespace struct {
IPCNamespaceRefs
// User namespace which owns this IPC namespace. Immutable.
userNS *auth.UserNamespace
queues *msgqueue.Registry
semaphores *semaphore.Registry
shms *shm.Registry
}
// NewIPCNamespace creates a new IPC namespace.
func NewIPCNamespace(userNS *auth.UserNamespace) *IPCNamespace {
ns := &IPCNamespace{
userNS: userNS,
queues: msgqueue.NewRegistry(userNS),
semaphores: semaphore.NewRegistry(userNS),
shms: shm.NewRegistry(userNS),
}
ns.InitRefs()
return ns
}
// MsgqueueRegistry returns the message queue registry for this namespace.
func (i *IPCNamespace) MsgqueueRegistry() *msgqueue.Registry {
return i.queues
}
// SemaphoreRegistry returns the semaphore set registry for this namespace.
func (i *IPCNamespace) SemaphoreRegistry() *semaphore.Registry {
return i.semaphores
}
// ShmRegistry returns the shm segment registry for this namespace.
func (i *IPCNamespace) ShmRegistry() *shm.Registry {
return i.shms
}
// DecRef implements refsvfs2.RefCounter.DecRef.
func (i *IPCNamespace) DecRef(ctx context.Context) {
i.IPCNamespaceRefs.DecRef(func() {
i.shms.Release(ctx)
})
}
// IPCNamespace returns the task's IPC namespace.
func (t *Task) IPCNamespace() *IPCNamespace {
t.mu.Lock()
defer t.mu.Unlock()
return t.ipcns
}
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