+
−/* Determine the session ID of the controlling terminal of the current process.
+
−   Copyright (C) 2010-2013 Free Software Foundation, Inc.
+
−
+
−   This program is free software; you can redistribute it and/or modify
+
−   it under the terms of the GNU General Public License as published by
+
−   the Free Software Foundation; either version 2, or (at your option)
+
−   any later version.
+
−
+
−   This program is distributed in the hope that it will be useful,
+
−   but WITHOUT ANY WARRANTY; without even the implied warranty of
+
−   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+
−   GNU General Public License for more details.
+
−
+
−   You should have received a copy of the GNU General Public License
+
−   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
−
+
−#include <config.h>
+
−
+
−#define USE_OLD_TTY /* needed on OpenBSD 4.5, so that TIOCGSID gets defined */
+
−
+
−/* Specification.  */
+
−#include <termios.h>
+
−
+
−#include <errno.h>
+
−#include <sys/ioctl.h>
+
−
+
−pid_t
+
−tcgetsid (int fd)
+
−{
+
−#ifdef TIOCGSID /* Mac OS X, OpenBSD */
+
−  int sid;
+
−
+
−  if (ioctl (fd, TIOCGSID, &sid) < 0)
+
−    return -1; /* errno is set here */
+
−
+
−  return sid;
+
−#else /* FreeBSD, Cygwin, mingw */
+
−  errno = ENOSYS;
+
−  return -1;
+
−#endif
+
−}