| //go:build darwin |
| // +build darwin |
| |
| package pty |
| |
| import ( |
| "errors" |
| "os" |
| "syscall" |
| "unsafe" |
| ) |
| |
| func open() (pty, tty *os.File, err error) { |
| pFD, err := syscall.Open("/dev/ptmx", syscall.O_RDWR|syscall.O_CLOEXEC, 0) |
| if err != nil { |
| return nil, nil, err |
| } |
| p := os.NewFile(uintptr(pFD), "/dev/ptmx") |
| // In case of error after this point, make sure we close the ptmx fd. |
| defer func() { |
| if err != nil { |
| _ = p.Close() // Best effort. |
| } |
| }() |
| |
| sname, err := ptsname(p) |
| if err != nil { |
| return nil, nil, err |
| } |
| |
| if err := grantpt(p); err != nil { |
| return nil, nil, err |
| } |
| |
| if err := unlockpt(p); err != nil { |
| return nil, nil, err |
| } |
| |
| t, err := os.OpenFile(sname, os.O_RDWR|syscall.O_NOCTTY, 0) |
| if err != nil { |
| return nil, nil, err |
| } |
| return p, t, nil |
| } |
| |
| func ptsname(f *os.File) (string, error) { |
| n := make([]byte, _IOC_PARM_LEN(syscall.TIOCPTYGNAME)) |
| |
| err := ioctl(f.Fd(), syscall.TIOCPTYGNAME, uintptr(unsafe.Pointer(&n[0]))) |
| if err != nil { |
| return "", err |
| } |
| |
| for i, c := range n { |
| if c == 0 { |
| return string(n[:i]), nil |
| } |
| } |
| return "", errors.New("TIOCPTYGNAME string not NUL-terminated") |
| } |
| |
| func grantpt(f *os.File) error { |
| return ioctl(f.Fd(), syscall.TIOCPTYGRANT, 0) |
| } |
| |
| func unlockpt(f *os.File) error { |
| return ioctl(f.Fd(), syscall.TIOCPTYUNLK, 0) |
| } |