1//go:build openbsd
2//+build openbsd
3
4package pty
5
6import (
7	"os"
8	"syscall"
9	"unsafe"
10)
11
12func open() (pty, tty *os.File, err error) {
13	/*
14	 * from ptm(4):
15	 * The PTMGET command allocates a free pseudo terminal, changes its
16	 * ownership to the caller, revokes the access privileges for all previous
17	 * users, opens the file descriptors for the pty and tty devices and
18	 * returns them to the caller in struct ptmget.
19	 */
20
21	p, err := os.OpenFile("/dev/ptm", os.O_RDWR|syscall.O_CLOEXEC, 0)
22	if err != nil {
23		return nil, nil, err
24	}
25	defer p.Close()
26
27	var ptm ptmget
28	if err := ioctl(p.Fd(), uintptr(ioctl_PTMGET), uintptr(unsafe.Pointer(&ptm))); err != nil {
29		return nil, nil, err
30	}
31
32	pty = os.NewFile(uintptr(ptm.Cfd), "/dev/ptm")
33	tty = os.NewFile(uintptr(ptm.Sfd), "/dev/ptm")
34
35	return pty, tty, nil
36}
37