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//go:build linux || darwin
// +build linux darwin
package pty
import (
"fmt"
"os"
"os/exec"
"syscall"
)
const Supported = true
func SetCtty(cmd *exec.Cmd, tty *os.File) {
cmd.SysProcAttr = &syscall.SysProcAttr{
Setctty: true,
Setsid: true,
Ctty: 3,
}
cmd.ExtraFiles = []*os.File{tty}
}
func Open() (pty, tty *os.File, err error) {
p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
if err != nil {
return nil, nil, fmt.Errorf("failed to open pty multiplexer: %v", err)
}
defer func() {
if err != nil {
p.Close()
}
}()
name, err := ptyName(p)
if err != nil {
return nil, nil, fmt.Errorf("failed to obtain tty name: %v", err)
}
if err := ptyGrant(p); err != nil {
return nil, nil, fmt.Errorf("failed to grant pty: %v", err)
}
if err := ptyUnlock(p); err != nil {
return nil, nil, fmt.Errorf("failed to unlock pty: %v", err)
}
t, err := os.OpenFile(name, os.O_RDWR|syscall.O_NOCTTY, 0)
if err != nil {
return nil, nil, fmt.Errorf("failed to open TTY: %v", err)
}
return p, t, nil
}
func ioctl(f *os.File, name string, cmd, ptr uintptr) error {
_, _, err := syscall.Syscall(syscall.SYS_IOCTL, f.Fd(), cmd, ptr)
if err != 0 {
return fmt.Errorf("%s ioctl failed: %v", name, err)
}
return nil
}
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