3b21a9901b
Add support for terminal resizing for exec, attach, and run. Note that for Docker, exec sessions inherit the environment from the primary process, so if the container was created with tty=false, that means the exec session's TERM variable will default to "dumb". Users can override this by setting TERM=xterm (or whatever is appropriate) to get the correct "smart" terminal behavior.
61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
// +build !windows
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/*
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Copyright 2016 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package term
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import (
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"os"
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"os/signal"
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"syscall"
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"k8s.io/kubernetes/pkg/util/runtime"
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)
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// monitorResizeEvents spawns a goroutine that waits for SIGWINCH signals (these indicate the
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// terminal has resized). After receiving a SIGWINCH, this gets the terminal size and tries to send
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// it to the resizeEvents channel. The goroutine stops when the stop channel is closed.
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func monitorResizeEvents(fd uintptr, resizeEvents chan<- Size, stop chan struct{}) {
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go func() {
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defer runtime.HandleCrash()
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winch := make(chan os.Signal, 1)
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signal.Notify(winch, syscall.SIGWINCH)
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defer signal.Stop(winch)
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for {
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select {
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case <-winch:
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size := GetSize(fd)
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if size == nil {
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return
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}
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// try to send size
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select {
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case resizeEvents <- *size:
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// success
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default:
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// not sent
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}
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case <-stop:
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return
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}
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}
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}()
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}
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