mirror of https://github.com/docker/cli.git
81 lines
1.5 KiB
Go
81 lines
1.5 KiB
Go
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package pty
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import (
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"errors"
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"os"
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"strings"
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"syscall"
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"unsafe"
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)
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// same code as pty_darwin.go
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func open() (pty, tty *os.File, err error) {
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p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
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if err != nil {
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return nil, nil, err
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}
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// In case of error after this point, make sure we close the ptmx fd.
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defer func() {
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if err != nil {
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_ = p.Close() // Best effort.
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}
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}()
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sname, err := ptsname(p)
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if err != nil {
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return nil, nil, err
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}
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if err := grantpt(p); err != nil {
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return nil, nil, err
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}
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if err := unlockpt(p); err != nil {
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return nil, nil, err
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}
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t, err := os.OpenFile(sname, os.O_RDWR, 0)
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if err != nil {
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return nil, nil, err
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}
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return p, t, nil
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}
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func grantpt(f *os.File) error {
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_, err := isptmaster(f.Fd())
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return err
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}
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func unlockpt(f *os.File) error {
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_, err := isptmaster(f.Fd())
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return err
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}
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func isptmaster(fd uintptr) (bool, error) {
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err := ioctl(fd, syscall.TIOCISPTMASTER, 0)
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return err == nil, err
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}
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var (
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emptyFiodgnameArg fiodgnameArg
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ioctl_FIODNAME = _IOW('f', 120, unsafe.Sizeof(emptyFiodgnameArg))
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)
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func ptsname(f *os.File) (string, error) {
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name := make([]byte, _C_SPECNAMELEN)
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fa := fiodgnameArg{Name: (*byte)(unsafe.Pointer(&name[0])), Len: _C_SPECNAMELEN, Pad_cgo_0: [4]byte{0, 0, 0, 0}}
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err := ioctl(f.Fd(), ioctl_FIODNAME, uintptr(unsafe.Pointer(&fa)))
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if err != nil {
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return "", err
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}
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for i, c := range name {
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if c == 0 {
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s := "/dev/" + string(name[:i])
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return strings.Replace(s, "ptm", "pts", -1), nil
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}
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}
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return "", errors.New("TIOCPTYGNAME string not NUL-terminated")
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}
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