Merge commit 'v2.6.29' into x86/setup-lzma
[linux-2.6] / arch / um / os-Linux / tty.c
1 /*
2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3  * Licensed under the GPL
4  */
5
6 #include <stdlib.h>
7 #include <unistd.h>
8 #include <errno.h>
9 #include <fcntl.h>
10 #include "kern_constants.h"
11 #include "kern_util.h"
12 #include "os.h"
13 #include "user.h"
14
15 struct grantpt_info {
16         int fd;
17         int res;
18         int err;
19 };
20
21 static void grantpt_cb(void *arg)
22 {
23         struct grantpt_info *info = arg;
24
25         info->res = grantpt(info->fd);
26         info->err = errno;
27 }
28
29 int get_pty(void)
30 {
31         struct grantpt_info info;
32         int fd, err;
33
34         fd = open("/dev/ptmx", O_RDWR);
35         if (fd < 0) {
36                 err = -errno;
37                 printk(UM_KERN_ERR "get_pty : Couldn't open /dev/ptmx - "
38                        "err = %d\n", errno);
39                 return err;
40         }
41
42         info.fd = fd;
43         initial_thread_cb(grantpt_cb, &info);
44
45         if (info.res < 0) {
46                 err = -info.err;
47                 printk(UM_KERN_ERR "get_pty : Couldn't grant pty - "
48                        "errno = %d\n", -info.err);
49                 goto out;
50         }
51
52         if (unlockpt(fd) < 0) {
53                 err = -errno;
54                 printk(UM_KERN_ERR "get_pty : Couldn't unlock pty - "
55                        "errno = %d\n", errno);
56                 goto out;
57         }
58         return fd;
59 out:
60         close(fd);
61         return err;
62 }