1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/* Assign a given terminal as controlling terminal and as standard input,
standard output, standard error of the current process.
Copyright (C) 2010-2014 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Currently no specification header. */
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
int
login_tty (int slave_fd)
{
int i;
/* Create a new session. */
setsid ();
/* Make fd the controlling terminal for the current process.
On BSD and OSF/1: There is ioctl TIOCSCTTY for this purpose.
On Solaris:
A terminal becomes the controlling terminal of a session
if it is being open()ed, at a moment when
1. it is not already the controlling terminal of some session, and
2. the process that open()s it is a session leader that does not have
a controlling terminal.
We assume condition 1, try to ensure condition 2, and then open() it.
*/
for (i = 0; i < 3; i++)
if (i != slave_fd)
close (i);
#ifdef TIOCSCTTY
if (ioctl (slave_fd, TIOCSCTTY, NULL) < 0)
return -1;
#else
{
char *slave_name;
int dummy_fd;
slave_name = ttyname (slave_fd);
if (slave_name == NULL)
return -1;
dummy_fd = open (slave_name, O_RDWR);
if (dummy_fd < 0)
return -1;
close (dummy_fd);
}
#endif
/* Assign fd to the standard input, standard output, and standard error of
the current process. */
for (i = 0; i < 3; i++)
if (slave_fd != i)
if (dup2 (slave_fd, i) < 0)
return -1;
if (slave_fd >= 3)
close (slave_fd);
return 0;
}
|
