1
2
3
4 package pty
5
6 import (
7 "fmt"
8 "os"
9 "os/exec"
10 "syscall"
11 )
12
13 const Supported = true
14
15 func SetCtty(cmd *exec.Cmd, tty *os.File) {
16 cmd.SysProcAttr = &syscall.SysProcAttr{
17 Setctty: true,
18 Setsid: true,
19 Ctty: 3,
20 }
21 cmd.ExtraFiles = []*os.File{tty}
22 }
23
24 func Open() (pty, tty *os.File, err error) {
25 p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
26 if err != nil {
27 return nil, nil, fmt.Errorf("failed to open pty multiplexer: %v", err)
28 }
29 defer func() {
30 if err != nil {
31 p.Close()
32 }
33 }()
34
35 name, err := ptyName(p)
36 if err != nil {
37 return nil, nil, fmt.Errorf("failed to obtain tty name: %v", err)
38 }
39
40 if err := ptyGrant(p); err != nil {
41 return nil, nil, fmt.Errorf("failed to grant pty: %v", err)
42 }
43
44 if err := ptyUnlock(p); err != nil {
45 return nil, nil, fmt.Errorf("failed to unlock pty: %v", err)
46 }
47
48 t, err := os.OpenFile(name, os.O_RDWR|syscall.O_NOCTTY, 0)
49 if err != nil {
50 return nil, nil, fmt.Errorf("failed to open TTY: %v", err)
51 }
52
53 return p, t, nil
54 }
55
56 func ioctl(f *os.File, name string, cmd, ptr uintptr) error {
57 _, _, err := syscall.Syscall(syscall.SYS_IOCTL, f.Fd(), cmd, ptr)
58 if err != 0 {
59 return fmt.Errorf("%s ioctl failed: %v", name, err)
60 }
61 return nil
62 }
63
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