| package pty |
| |
| import ( |
| "os" |
| "syscall" |
| "unsafe" |
| ) |
| |
| const ( |
| sys_TIOCGPTN = 0x80045430 |
| sys_TIOCSPTLCK = 0x40045431 |
| ) |
| |
| |
| // Opens a pty and its corresponding tty. |
| func Open() (pty, tty *os.File, err os.Error) { |
| p, err := os.Open("/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 |
| } |
| |
| t, err := os.Open(sname, os.O_RDWR, 0) |
| if err != nil { |
| return nil, nil, err |
| } |
| return p, t, nil |
| } |
| |
| const ( |
| ptdev1 = "pqrsPQRS" |
| ptdev2 = "0123456789abcdefghijklmnopqrstuv" |
| ) |
| |
| func ptsname(f *os.File) (string, os.Error) { |
| fi, err := f.Stat() |
| if err != nil { |
| return "", err |
| } |
| return "/dev/tty" + string([]byte{ |
| ptdev1[minor(fi.Rdev)/32], |
| ptdev2[minor(fi.Rdev)%32], |
| }), nil |
| } |
| |
| |
| func grantpt(f *os.File) os.Error { |
| p, err := os.StartProcess("/bin/ptchown", []string{"/bin/ptchown"}, |
| nil, "", []*os.File{f}) |
| if err != nil { |
| return err |
| } |
| w, err := p.Wait(0) |
| if err != nil { |
| return err |
| } |
| if w.Exited() && w.ExitStatus() == 0 { |
| return nil |
| } |
| return os.EACCES |
| } |
| |
| |
| func ioctl(fd int, cmd uint, data *int) os.Error { |
| _, _, e := syscall.Syscall( |
| syscall.SYS_IOCTL, |
| uintptr(fd), |
| uintptr(cmd), |
| uintptr(unsafe.Pointer(data)), |
| ) |
| if e != 0 { |
| return os.ENOTTY |
| } |
| return nil |
| } |
| |
| |
| func minor(d uint64) int { |
| return int(d & 0xffffffff) |
| } |