1 /* Determine the session ID of the controlling terminal of the current process.
2 Copyright (C) 2010 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 #define USE_OLD_TTY /* needed on OpenBSD 4.5, so that TIOCGSID gets defined */
26 #include <sys/ioctl.h>
31 #ifdef TIOCGSID /* MacOS X, OpenBSD */
34 if (ioctl (fd, TIOCGSID, &sid) < 0)
35 return -1; /* errno is set here */
38 #else /* FreeBSD, Cygwin, mingw */