mirror of
https://github.com/hanzoai/visor.git
synced 2026-09-24 17:04:14 +00:00
Zyad A. Ali
3ec265cb51
CtxIPCNamespace is needed by mqfs package to be able to retreive an IPCNamespace using ctx.Value. As ctx.Value compares keys as interfaces, we need to use type kernel.contextID in package mqfs, which is not possible due to circular depenedency, so move it to kernel/ipc instead. Updates #136
97 lines
2.8 KiB
Go
97 lines
2.8 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kernel
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import (
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"gvisor.dev/gvisor/pkg/context"
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"gvisor.dev/gvisor/pkg/sentry/kernel/ipc"
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)
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// contextID is the kernel package's type for context.Context.Value keys.
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type contextID int
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const (
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// CtxCanTrace is a Context.Value key for a function with the same
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// signature and semantics as kernel.Task.CanTrace.
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CtxCanTrace contextID = iota
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// CtxKernel is a Context.Value key for a Kernel.
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CtxKernel
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// CtxPIDNamespace is a Context.Value key for a PIDNamespace.
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CtxPIDNamespace
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// CtxTask is a Context.Value key for a Task.
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CtxTask
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// CtxUTSNamespace is a Context.Value key for a UTSNamespace.
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CtxUTSNamespace
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)
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// ContextCanTrace returns true if ctx is permitted to trace t, in the same sense
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// as kernel.Task.CanTrace.
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func ContextCanTrace(ctx context.Context, t *Task, attach bool) bool {
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if v := ctx.Value(CtxCanTrace); v != nil {
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return v.(func(*Task, bool) bool)(t, attach)
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}
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return false
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}
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// KernelFromContext returns the Kernel in which ctx is executing, or nil if
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// there is no such Kernel.
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func KernelFromContext(ctx context.Context) *Kernel {
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if v := ctx.Value(CtxKernel); v != nil {
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return v.(*Kernel)
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}
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return nil
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}
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// PIDNamespaceFromContext returns the PID namespace in which ctx is executing,
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// or nil if there is no such PID namespace.
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func PIDNamespaceFromContext(ctx context.Context) *PIDNamespace {
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if v := ctx.Value(CtxPIDNamespace); v != nil {
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return v.(*PIDNamespace)
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}
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return nil
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}
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// UTSNamespaceFromContext returns the UTS namespace in which ctx is executing,
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// or nil if there is no such UTS namespace.
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func UTSNamespaceFromContext(ctx context.Context) *UTSNamespace {
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if v := ctx.Value(CtxUTSNamespace); v != nil {
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return v.(*UTSNamespace)
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}
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return nil
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}
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// IPCNamespaceFromContext returns the IPC namespace in which ctx is executing,
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// or nil if there is no such IPC namespace. It takes a reference on the
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// namespace.
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func IPCNamespaceFromContext(ctx context.Context) *IPCNamespace {
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if v := ctx.Value(ipc.CtxIPCNamespace); v != nil {
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return v.(*IPCNamespace)
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}
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return nil
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}
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// TaskFromContext returns the Task associated with ctx, or nil if there is no
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// such Task.
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func TaskFromContext(ctx context.Context) *Task {
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if v := ctx.Value(CtxTask); v != nil {
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return v.(*Task)
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}
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return nil
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}
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