42 lines
1.2 KiB
Go
42 lines
1.2 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 "gvisor.dev/gvisor/pkg/sync"
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// TTY defines the relationship between a thread group and its controlling
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// terminal.
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//
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// +stateify savable
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type TTY struct {
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// Index is the terminal index. It is immutable.
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Index uint32
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mu sync.Mutex `state:"nosave"`
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// tg is protected by mu.
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tg *ThreadGroup
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}
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// TTY returns the thread group's controlling terminal. If nil, there is no
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// controlling terminal.
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func (tg *ThreadGroup) TTY() *TTY {
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tg.pidns.owner.mu.RLock()
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defer tg.pidns.owner.mu.RUnlock()
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tg.signalHandlers.mu.Lock()
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defer tg.signalHandlers.mu.Unlock()
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return tg.tty
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}
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