blob: e7f2d5b9efe12864cd4594bf68e475c37b6d1959 (
plain)
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
76
77
78
79
80
81
82
83
84
85
|
/* Determine name of the slave side of a pseudo-terminal.
Copyright (C) 1998, 2002, 2010-2011 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>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef _LIBC
# include <paths.h>
#else
# ifndef _PATH_TTY
# define _PATH_TTY "/dev/tty"
# endif
# ifndef _PATH_DEV
# define _PATH_DEV "/dev/"
# endif
# define __set_errno(e) errno = (e)
# define __isatty isatty
# define __stat stat
# define __ttyname_r ttyname_r
# define __ptsname_r ptsname_r
#endif
/* Store at most BUFLEN characters of the pathname of the slave pseudo
terminal associated with the master FD is open on in BUF.
Return 0 on success, otherwise an error number. */
int
__ptsname_r (int fd, char *buf, size_t buflen)
{
int save_errno = errno;
int err;
struct stat st;
if (buf == NULL)
{
__set_errno (EINVAL);
return EINVAL;
}
if (!__isatty (fd))
/* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */
return errno;
if (buflen < strlen (_PATH_TTY) + 3)
{
__set_errno (ERANGE);
return ERANGE;
}
err = __ttyname_r (fd, buf, buflen);
if (err != 0)
{
__set_errno (err);
return errno;
}
buf[sizeof (_PATH_DEV) - 1] = 't';
if (__stat (buf, &st) < 0)
return errno;
__set_errno (save_errno);
return 0;
}
|
