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
|
/* Copyright (C) 1991-2023 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#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>
#include <set-freeres.h>
char *__ttyname;
static char *getttyname (int fd, dev_t mydev, ino_t myino,
int save, int *dostat);
static char *getttyname_name;
weak_alias (getttyname_name, __ttyname_freemem_ptr)
static char *
getttyname (int fd, dev_t mydev, ino_t myino, int save, int *dostat)
{
static const char dev[] = "/dev";
static size_t namelen;
struct stat st;
DIR *dirstream;
struct dirent *d;
dirstream = __opendir (dev);
if (dirstream == NULL)
{
*dostat = -1;
return NULL;
}
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"))
{
size_t dlen = _D_ALLOC_NAMLEN (d);
if (sizeof (dev) + dlen > namelen)
{
free (getttyname_name);
namelen = 2 * (sizeof (dev) + dlen); /* Big enough. */
getttyname_name = malloc (namelen);
if (! getttyname_name)
{
*dostat = -1;
/* Perhaps it helps to free the directory stream buffer. */
(void) __closedir (dirstream);
return NULL;
}
*((char *) __mempcpy (getttyname_name, dev, sizeof (dev) - 1))
= '/';
}
(void) __mempcpy (&getttyname_name[sizeof (dev)], d->d_name, dlen);
if (stat (getttyname_name, &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);
__ttyname = getttyname_name;
__set_errno (save);
return getttyname_name;
}
}
(void) __closedir (dirstream);
__set_errno (save);
return NULL;
}
/* Return the pathname of the terminal FD is open on, or NULL on errors.
The returned storage is good only until the next call to this function. */
char *
ttyname (int fd)
{
struct stat st;
int dostat = 0;
char *name;
int save = errno;
if (!__isatty (fd))
return NULL;
if (fstat (fd, &st) < 0)
return NULL;
#ifdef _STATBUF_ST_RDEV
name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat);
#else
name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat);
#endif
if (!name && dostat != -1)
{
dostat = 1;
#ifdef _STATBUF_ST_RDEV
name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat);
#else
name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat);
#endif
}
return name;
}
|
