1 /* Copyright (C) 1991,92,93,1996-2001,2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <sys/types.h>
29 #include <stdio-common/_itoa.h>
32 /* Is this used anywhere? It is not exported. */
36 static char *getttyname (const char *dev
, dev_t mydev
,
37 ino64_t myino
, int save
, int *dostat
)
41 static char *getttyname_name
;
45 getttyname (const char *dev
, dev_t mydev
, ino64_t myino
, int save
, int *dostat
)
47 static size_t namelen
;
51 size_t devlen
= strlen (dev
) + 1;
53 dirstream
= __opendir (dev
);
54 if (dirstream
== NULL
)
60 while ((d
= __readdir64 (dirstream
)) != NULL
)
61 if ((d
->d_fileno
== myino
|| *dostat
)
62 && strcmp (d
->d_name
, "stdin")
63 && strcmp (d
->d_name
, "stdout")
64 && strcmp (d
->d_name
, "stderr"))
66 size_t dlen
= _D_ALLOC_NAMLEN (d
);
67 if (devlen
+ dlen
> namelen
)
69 free (getttyname_name
);
70 namelen
= 2 * (devlen
+ dlen
); /* Big enough. */
71 getttyname_name
= malloc (namelen
);
72 if (! getttyname_name
)
75 /* Perhaps it helps to free the directory stream buffer. */
76 (void) __closedir (dirstream
);
79 *((char *) __mempcpy (getttyname_name
, dev
, devlen
- 1)) = '/';
81 memcpy (&getttyname_name
[devlen
], d
->d_name
, dlen
);
82 if (__xstat64 (_STAT_VER
, getttyname_name
, &st
) == 0
83 #ifdef _STATBUF_ST_RDEV
84 && S_ISCHR (st
.st_mode
) && st
.st_rdev
== mydev
86 && d
->d_fileno
== myino
&& st
.st_dev
== mydev
90 (void) __closedir (dirstream
);
92 __ttyname
= getttyname_name
;
95 return getttyname_name
;
99 (void) __closedir (dirstream
);
105 /* Static buffer in `ttyname'. */
106 static char *ttyname_buf
;
109 /* Return the pathname of the terminal FD is open on, or NULL on errors.
110 The returned storage is good only until the next call to this function. */
114 static size_t buflen
;
116 struct stat64 st
, st1
;
125 /* We try using the /proc filesystem. */
126 *_fitoa_word (fd
, __stpcpy (procname
, "/proc/self/fd/"), 10, 0) = '\0';
131 ttyname_buf
= (char *) malloc (buflen
+ 1);
132 if (ttyname_buf
== NULL
)
139 len
= __readlink (procname
, ttyname_buf
, buflen
);
141 /* This is for Linux 2.0. */
142 && ttyname_buf
[0] != '[')
144 if ((size_t) len
>= buflen
)
146 /* readlink need not terminate the string. */
147 ttyname_buf
[len
] = '\0';
151 if (__fxstat64 (_STAT_VER
, fd
, &st
) < 0)
154 if (__xstat64 (_STAT_VER
, "/dev/pts", &st1
) == 0 && S_ISDIR (st1
.st_mode
))
156 #ifdef _STATBUF_ST_RDEV
157 name
= getttyname ("/dev/pts", st
.st_rdev
, st
.st_ino
, save
, &dostat
);
159 name
= getttyname ("/dev/pts", st
.st_dev
, st
.st_ino
, save
, &dostat
);
168 if (!name
&& dostat
!= -1)
170 #ifdef _STATBUF_ST_RDEV
171 name
= getttyname ("/dev", st
.st_rdev
, st
.st_ino
, save
, &dostat
);
173 name
= getttyname ("/dev", st
.st_dev
, st
.st_ino
, save
, &dostat
);
177 if (!name
&& dostat
!= -1)
180 #ifdef _STATBUF_ST_RDEV
181 name
= getttyname ("/dev", st
.st_rdev
, st
.st_ino
, save
, &dostat
);
183 name
= getttyname ("/dev", st
.st_dev
, st
.st_ino
, save
, &dostat
);
195 free (getttyname_name
);
197 text_set_element (__libc_subfreeres
, free_mem
);