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|
package pty
import (
"os"
"strconv"
"syscall"
"unsafe"
)
const (
sys_TIOCGPTN = 0x4004740F
sys_TIOCSPTLCK = 0x40045431
)
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
}
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 int
err := ioctl(f.Fd(), sys_TIOCGPTN, &n)
if err != nil {
return "", err
}
return "/dev/pts/" + strconv.Itoa(n), nil
}
func ioctl(fd uintptr, cmd uintptr, data *int) error {
_, _, e := syscall.Syscall(
syscall.SYS_IOCTL,
fd,
cmd,
uintptr(unsafe.Pointer(data)),
)
if e != 0 {
return syscall.ENOTTY
}
return nil
}
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