1 /* Copyright (C) 1991, 92, 93, 95, 96 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
23 #include <sys/types.h>
30 # define MIN(a, b) ((a) < (b) ? (a) : (b))
33 /* Store at most BUFLEN character of the pathname of the terminal FD is
34 open on in BUF. Return 0 on success, -1 otherwise. */
36 __ttyname_r (fd
, buf
, buflen
)
41 static const char dev
[] = "/dev";
46 struct dirent dirbuf
, *d
;
49 /* Test for the absolute minimal size. This makes life easier inside
51 if (buflen
< (int) (sizeof (dev
) + 1))
63 if (fstat (fd
, &st
) < 0)
68 dirstream
= opendir (dev
);
69 if (dirstream
== NULL
)
72 /* Prepare the result buffer. */
73 memcpy (buf
, dev
, sizeof (dev
) - 1);
74 buf
[sizeof (dev
) - 1] = '/';
75 buflen
-= sizeof (dev
);
77 while (__readdir_r (dirstream
, &dirbuf
, &d
) >= 0)
78 if ((ino_t
) d
->d_fileno
== myino
)
81 size_t needed
= _D_EXACT_NAMLEN (d
) + 1;
85 (void) closedir (dirstream
);
90 cp
= __stpncpy (&buf
[sizeof (dev
)], d
->d_name
, needed
);
93 if (stat (buf
, &st
) == 0 && st
.st_dev
== mydev
)
95 (void) closedir (dirstream
);
101 (void) closedir (dirstream
);
103 /* It is not clear what to return in this case. `isatty' says FD
104 refers to a TTY but no entry in /dev has this inode. */
107 weak_alias (__ttyname_r
, ttyname_r
)