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/* Determine the session ID of the controlling terminal of the current process.
Copyright (C) 2010-2019 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 <https://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
}
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