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/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
/* Return the session ID of FD. */
pid_t
tcgetsid (fd)
int fd;
{
pid_t pgrp;
pid_t sid;
#ifdef TIOCGSID
static int tiocgsid_works = 1;
if (tiocgsid_works)
{
int serrno = errno;
int sid;
if (__ioctl (fd, TIOCGSID, &sid) < 0)
{
if (errno == EINVAL)
{
tiocgsid_works = 0;
__set_errno (serrno);
}
else
return (pid_t) -1;
}
else
return (pid_t) sid;
}
#endif
pgrp = tcgetpgrp (fd);
if (pgrp == -1)
return (pid_t) -1;
sid = getsid (pgrp);
if (sid == -1 && errno == ESRCH)
__set_errno (ENOTTY);
return sid;
}
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