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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/* Copyright (C) 1991, 92, 93, 95, 96, 97, 98 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
static const char dev[] = "/dev";
static int getttyname_r __P ((int fd, char *buf, size_t buflen,
dev_t mydev, ino_t myino, int save,
int *dostat)) internal_function;
static int
internal_function
getttyname_r (fd, buf, buflen, mydev, myino, save, dostat)
int fd;
char *buf;
size_t buflen;
dev_t mydev;
ino_t myino;
int save;
int *dostat;
{
struct stat st;
DIR *dirstream;
struct dirent *d;
dirstream = __opendir (dev);
if (dirstream == NULL)
{
*dostat = -1;
return errno;
}
while ((d = __readdir (dirstream)) != NULL)
if (((ino_t) d->d_fileno == myino || *dostat)
&& strcmp (d->d_name, "stdin")
&& strcmp (d->d_name, "stdout")
&& strcmp (d->d_name, "stderr"))
{
char *cp;
size_t needed = _D_EXACT_NAMLEN (d) + 1;
if (needed > buflen)
{
*dostat = -1;
(void) __closedir (dirstream);
__set_errno (ERANGE);
return ERANGE;
}
cp = __stpncpy (&buf[sizeof (dev)], d->d_name, needed);
cp[0] = '\0';
if (stat (buf, &st) == 0
#ifdef _STATBUF_ST_RDEV
&& S_ISCHR (st.st_mode) && st.st_rdev == mydev
#else
&& (ino_t) d->d_fileno == myino && st.st_dev == mydev
#endif
)
{
(void) __closedir (dirstream);
__set_errno (save);
return 0;
}
}
(void) __closedir (dirstream);
__set_errno (save);
/* It is not clear what to return in this case. `isatty' says FD
refers to a TTY but no entry in /dev has this inode. */
return ENOTTY;
}
/* Store at most BUFLEN character of the pathname of the terminal FD is
open on in BUF. Return 0 on success, otherwise an error number. */
int
__ttyname_r (fd, buf, buflen)
int fd;
char *buf;
size_t buflen;
{
struct stat st;
int dostat = 0;
int save = errno;
int ret;
/* Test for the absolute minimal size. This makes life easier inside
the loop. */
if (!buf)
{
__set_errno (EINVAL);
return EINVAL;
}
if (buflen < (int) (sizeof (dev) + 1))
{
__set_errno (ERANGE);
return ERANGE;
}
if (!__isatty (fd))
{
__set_errno (ENOTTY);
return ENOTTY;
}
if (fstat (fd, &st) < 0)
return errno;
/* Prepare the result buffer. */
memcpy (buf, dev, sizeof (dev) - 1);
buf[sizeof (dev) - 1] = '/';
buflen -= sizeof (dev);
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save,
&dostat);
#else
ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save,
&dostat);
#endif
if (ret && dostat != -1)
{
dostat = 1;
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino,
save, &dostat);
#else
ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino,
save, &dostat);
#endif
}
return ret;
}
weak_alias (__ttyname_r, ttyname_r)
|
