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package pty
import (
"os"
"strconv"
"syscall"
"unsafe"
)
var (
ioctl_TIOCGPTN = _IOR('T', 0x30, unsafe.Sizeof(_C_uint(0))) /* Get Pty Number (of pty-mux device) */
ioctl_TIOCSPTLCK = _IOW('T', 0x31, unsafe.Sizeof(_C_int(0))) /* Lock/unlock Pty */
)
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 = unlockpt(p)
if 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) {
var n _C_uint
err := ioctl(f.Fd(), ioctl_TIOCGPTN, uintptr(unsafe.Pointer(&n)))
if err != nil {
return "", err
}
return "/dev/pts/" + strconv.Itoa(int(n)), nil
}
func unlockpt(f *os.File) error {
var u _C_int
// use TIOCSPTLCK with a zero valued arg to clear the slave pty lock
return ioctl(f.Fd(), ioctl_TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
}
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