Commit | Line | Data |
---|---|---|
edea1385 JD |
1 | /* |
2 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) | |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
6 | #include <stdlib.h> | |
edea1385 | 7 | #include <unistd.h> |
1da177e4 | 8 | #include <errno.h> |
edea1385 | 9 | #include <fcntl.h> |
37185b33 AV |
10 | #include <kern_util.h> |
11 | #include <os.h> | |
1da177e4 LT |
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; | |
edea1385 JD |
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; | |
1da177e4 LT |
38 | } |
39 | ||
40 | info.fd = fd; | |
41 | initial_thread_cb(grantpt_cb, &info); | |
42 | ||
edea1385 JD |
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; | |
1da177e4 | 48 | } |
edea1385 JD |
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; | |
1da177e4 | 55 | } |
edea1385 JD |
56 | return fd; |
57 | out: | |
58 | close(fd); | |
59 | return err; | |
1da177e4 | 60 | } |