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
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, 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";
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 ((d = readdir (dirstream)) != NULL)
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)