1 /* Determine name of a terminal.
3 Copyright (C) 2010-2011 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Written by Bruno Haible <bruno@clisp.org>, 2010. */
29 ttyname_r (int fd, char *buf, size_t buflen)
32 /* When ttyname_r exists, use it. */
34 /* This code is multithread-safe. */
35 /* On Solaris, ttyname_r always fails if buflen < 128. On OSF/1 5.1,
36 ttyname_r ignores the buffer size and assumes the buffer is large enough.
37 So provide a buffer that is large enough. */
39 # if HAVE_POSIXDECL_TTYNAME_R
41 (buflen < sizeof (largerbuf)
42 ? ttyname_r (fd, largerbuf, sizeof (largerbuf))
43 : ttyname_r (fd, buf, buflen <= INT_MAX ? buflen : INT_MAX));
46 if (buflen < sizeof (largerbuf))
48 size_t namelen = strlen (largerbuf);
51 memcpy (buf, largerbuf, namelen);
55 (buflen < sizeof (largerbuf)
56 ? ttyname_r (fd, largerbuf, sizeof (largerbuf))
57 : ttyname_r (fd, buf, buflen <= INT_MAX ? buflen : INT_MAX));
62 size_t namelen = strlen (name) + 1;
65 memmove (buf, name, namelen);
70 /* Note: This is not multithread-safe. */
77 namelen = strlen (name) + 1;
80 memcpy (buf, name, namelen);
83 /* Platforms like mingw: no ttys exist at all. */