func (p *process) openFifos(terminal bool) (pipe *IOPipe, err error) {
if err := os.MkdirAll(p.dir, 0700); err != nil {
return nil, err
}
ctx, _ := context.WithTimeout(context.Background(), 15*time.Second)
io := &IOPipe{}
io.Stdin, err = fifo.OpenFifo(ctx, p.fifo(unix.Stdin), unix.O_WRONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stdin.Close()
}
}()
io.Stdout, err = fifo.OpenFifo(ctx, p.fifo(unix.Stdout), unix.O_RDONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stdout.Close()
}
}()
if goruntime.GOOS == "solaris" || !terminal {
// For Solaris terminal handling is done exclusively by the runtime therefore we make no distinction
// in the processing for terminal and !terminal cases.
io.Stderr, err = fifo.OpenFifo(ctx, p.fifo(unix.Stderr), unix.O_RDONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stderr.Close()
}
}()
} else {
io.Stderr = ioutil.NopCloser(emptyReader{})
}
return io, nil
}
func (p *process) openFifos(terminal bool) (pipe *IOPipe, err error) {
if err := os.MkdirAll(p.dir, 0700); err != nil {
return nil, err
}
ctx, _ := context.WithTimeout(context.Background(), 15*time.Second)
io := &IOPipe{}
io.Stdin, err = fifo.OpenFifo(ctx, p.fifo(syscall.Stdin), syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stdin.Close()
}
}()
io.Stdout, err = fifo.OpenFifo(ctx, p.fifo(syscall.Stdout), syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stdout.Close()
}
}()
if !terminal {
io.Stderr, err = fifo.OpenFifo(ctx, p.fifo(syscall.Stderr), syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
io.Stderr.Close()
}
}()
} else {
io.Stderr = ioutil.NopCloser(emptyReader{})
}
return io, nil
}
func prepareStdio(in, out, err string) (*sync.WaitGroup, error) {
var (
wg sync.WaitGroup
dst io.Writer
src io.Reader
close func()
)
for _, f := range []struct {
name string
flags int
src bool
reader io.Reader
writer io.Writer
}{
{in, syscall.O_WRONLY | syscall.O_CREAT | syscall.O_NONBLOCK, false, os.Stdin, nil},
{out, syscall.O_RDONLY | syscall.O_CREAT | syscall.O_NONBLOCK, true, nil, os.Stdout},
{err, syscall.O_RDONLY | syscall.O_CREAT | syscall.O_NONBLOCK, true, nil, os.Stderr},
} {
ff, err := fifo.OpenFifo(gocontext.Background(), f.name, f.flags, 0700)
if err != nil {
return nil, err
}
defer func(c io.Closer) {
if err != nil {
c.Close()
}
}(ff)
if f.src {
src = ff
dst = f.writer
close = func() {
ff.Close()
wg.Done()
}
wg.Add(1)
} else {
src = f.reader
dst = ff
close = func() { ff.Close() }
}
go func(dst io.Writer, src io.Reader, close func()) {
io.Copy(dst, src)
close()
}(dst, src, close)
}
return &wg, nil
}
// discardFifos attempts to fully read the container fifos to unblock processes
// that may be blocked on the writer side.
func (ctr *container) discardFifos() {
ctx, _ := context.WithTimeout(context.Background(), 3*time.Second)
for _, i := range []int{syscall.Stdout, syscall.Stderr} {
f, err := fifo.OpenFifo(ctx, ctr.fifo(i), syscall.O_RDONLY|syscall.O_NONBLOCK, 0)
if err != nil {
logrus.Warnf("error opening fifo %v for discarding: %+v", f, err)
continue
}
go func() {
io.Copy(ioutil.Discard, f)
}()
}
}