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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [termios/] [tcgetsid.c] - Blame information for rev 1325

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Line No. Rev Author Line
1 1325 phoenix
/* Copyright (C) 1997, 1999 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Library General Public License as
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   published by the Free Software Foundation; either version 2 of the
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   License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Library General Public License for more details.
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   You should have received a copy of the GNU Library General Public
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   License along with the GNU C Library; see the file COPYING.LIB.  If not,
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   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include <errno.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#define __USE_XOPEN_EXTENDED
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#include <unistd.h>
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/* Return the session ID of FD.  */
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pid_t tcgetsid (int fd)
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{
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    pid_t pgrp;
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    pid_t sid;
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#ifdef TIOCGSID
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    static int tiocgsid_does_not_work;
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    if (! tiocgsid_does_not_work)
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    {
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        int serrno = errno;
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        int sid;
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        if (ioctl (fd, TIOCGSID, &sid) < 0)
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        {
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            if (errno == EINVAL)
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            {
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                tiocgsid_does_not_work = 1;
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                __set_errno(serrno);
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            }
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            else
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                return (pid_t) -1;
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        }
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        else
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            return (pid_t) sid;
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    }
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#endif
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    pgrp = tcgetpgrp (fd);
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    if (pgrp == -1)
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        return (pid_t) -1;
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    sid = getsid (pgrp);
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    if (sid == -1 && errno == ESRCH)
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        __set_errno(ENOTTY);
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    return sid;
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}

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