| package pty |
| |
| import ( |
| "errors" |
| "os" |
| "strings" |
| "syscall" |
| "unsafe" |
| ) |
| |
| // same code as pty_darwin.go |
| func open() (pty, tty *os.File, err error) { |
| p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0) |
| if err != nil { |
| return nil, nil, err |
| } |
| |
| sname, err := ptsname(p) |
| if err != nil { |
| return nil, nil, err |
| } |
| |
| err = grantpt(p) |
| if err != nil { |
| return nil, nil, err |
| } |
| |
| err = unlockpt(p) |
| if err != nil { |
| return nil, nil, err |
| } |
| |
| t, err := os.OpenFile(sname, os.O_RDWR, 0) |
| if err != nil { |
| return nil, nil, err |
| } |
| return p, t, nil |
| } |
| |
| func grantpt(f *os.File) error { |
| _, err := isptmaster(f.Fd()) |
| return err |
| } |
| |
| func unlockpt(f *os.File) error { |
| _, err := isptmaster(f.Fd()) |
| return err |
| } |
| |
| func isptmaster(fd uintptr) (bool, error) { |
| err := ioctl(fd, syscall.TIOCISPTMASTER, 0) |
| return err == nil, err |
| } |
| |
| var ( |
| emptyFiodgnameArg fiodgnameArg |
| ioctl_FIODNAME = _IOW('f', 120, unsafe.Sizeof(emptyFiodgnameArg)) |
| ) |
| |
| func ptsname(f *os.File) (string, error) { |
| name := make([]byte, _C_SPECNAMELEN) |
| fa := fiodgnameArg{Name: (*byte)(unsafe.Pointer(&name[0])), Len: _C_SPECNAMELEN, Pad_cgo_0: [4]byte{0, 0, 0, 0}} |
| |
| err := ioctl(f.Fd(), ioctl_FIODNAME, uintptr(unsafe.Pointer(&fa))) |
| if err != nil { |
| return "", err |
| } |
| |
| for i, c := range name { |
| if c == 0 { |
| s := "/dev/" + string(name[:i]) |
| return strings.Replace(s, "ptm", "pts", -1), nil |
| } |
| } |
| return "", errors.New("TIOCPTYGNAME string not NUL-terminated") |
| } |