d3aa7ee9f0
The new `go fmt` adds `//go:build` lines (https://golang.org/doc/go1.17#tools). Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
95 lines
1.9 KiB
Go
95 lines
1.9 KiB
Go
//go:build !windows
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// +build !windows
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/*
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Copyright The containerd 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 shim
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import (
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gocontext "context"
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"io"
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"os"
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"sync"
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"github.com/containerd/fifo"
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"golang.org/x/sys/unix"
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)
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var bufPool = sync.Pool{
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New: func() interface{} {
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buffer := make([]byte, 32<<10)
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return &buffer
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},
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}
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func prepareStdio(stdin, stdout, stderr string, console bool) (wg *sync.WaitGroup, err error) {
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wg = &sync.WaitGroup{}
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ctx := gocontext.Background()
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f, err := fifo.OpenFifo(ctx, stdin, unix.O_WRONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
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if err != nil {
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return nil, err
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}
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defer func(c io.Closer) {
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if err != nil {
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c.Close()
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}
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}(f)
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go func(w io.WriteCloser) {
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p := bufPool.Get().(*[]byte)
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defer bufPool.Put(p)
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io.CopyBuffer(w, os.Stdin, *p)
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w.Close()
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}(f)
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f, err = fifo.OpenFifo(ctx, stdout, unix.O_RDONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
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if err != nil {
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return nil, err
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}
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defer func(c io.Closer) {
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if err != nil {
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c.Close()
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}
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}(f)
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wg.Add(1)
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go func(r io.ReadCloser) {
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io.Copy(os.Stdout, r)
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r.Close()
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wg.Done()
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}(f)
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f, err = fifo.OpenFifo(ctx, stderr, unix.O_RDONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
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if err != nil {
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return nil, err
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}
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defer func(c io.Closer) {
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if err != nil {
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c.Close()
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}
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}(f)
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if !console {
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wg.Add(1)
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go func(r io.ReadCloser) {
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io.Copy(os.Stderr, r)
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r.Close()
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wg.Done()
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}(f)
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}
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return wg, nil
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}
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