1 /* Copyright (C) 1991, 1992, 1993, 1996 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>
29 char *__ttyname = NULL;
31 /* Return the pathname of the terminal FD is open on, or NULL on errors.
32 The returned storage is good only until the next call to this function. */
37 static const char dev[] = "/dev";
39 static size_t namelen = 0;
50 if (fstat (fd, &st) < 0)
55 dirstream = opendir (dev);
56 if (dirstream == NULL)
59 while ((d = readdir (dirstream)) != NULL)
60 if ((ino_t) d->d_fileno == myino)
62 size_t dlen = _D_ALLOC_NAMLEN (d);
63 if (sizeof (dev) + dlen > namelen)
66 namelen = 2 * (sizeof (dev) + dlen); /* Big enough. */
67 name = malloc (namelen);
70 /* Perhaps it helps to free the directory stream buffer. */
71 (void) closedir (dirstream);
74 (void) memcpy (name, dev, sizeof (dev) - 1);
75 name[sizeof (dev) - 1] = '/';
77 (void) memcpy (&name[sizeof (dev)], d->d_name, dlen);
78 if (stat (name, &st) == 0 && st.st_dev == mydev)
80 (void) closedir (dirstream);
87 (void) closedir (dirstream);