glibc/termios/tcgetsid.c
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

65 lines
1.6 KiB
C

/* Copyright (C) 1997, 1999 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; 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_does_not_work;
if (! tiocgsid_does_not_work)
{
int serrno = errno;
int sid;
if (__ioctl (fd, TIOCGSID, &sid) < 0)
{
if (errno == EINVAL)
{
tiocgsid_does_not_work = 1;
__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;
}