1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
4 | */ |
5 | |
6 | #include <stdlib.h> |
7 | #include <unistd.h> |
8 | #include <errno.h> |
9 | #include <fcntl.h> |
10 | #include <kern_util.h> |
11 | #include <os.h> |
12 | |
13 | struct grantpt_info { |
14 | int fd; |
15 | int res; |
16 | int err; |
17 | }; |
18 | |
19 | static void grantpt_cb(void *arg) |
20 | { |
21 | struct grantpt_info *info = arg; |
22 | |
23 | info->res = grantpt(info->fd); |
24 | info->err = errno; |
25 | } |
26 | |
27 | int get_pty(void) |
28 | { |
29 | struct grantpt_info info; |
30 | int fd, err; |
31 | |
32 | fd = open("/dev/ptmx" , O_RDWR); |
33 | if (fd < 0) { |
34 | err = -errno; |
35 | printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - " |
36 | "err = %d\n" , errno); |
37 | return err; |
38 | } |
39 | |
40 | info.fd = fd; |
41 | initial_thread_cb(grantpt_cb, &info); |
42 | |
43 | if (info.res < 0) { |
44 | err = -info.err; |
45 | printk(UM_KERN_ERR "get_pty : Couldn't grant pty - " |
46 | "errno = %d\n" , -info.err); |
47 | goto out; |
48 | } |
49 | |
50 | if (unlockpt(fd) < 0) { |
51 | err = -errno; |
52 | printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - " |
53 | "errno = %d\n" , errno); |
54 | goto out; |
55 | } |
56 | return fd; |
57 | out: |
58 | close(fd); |
59 | return err; |
60 | } |
61 | |