mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-21 02:10:05 +00:00
344c67b616
1999-04-29 Ulrich Drepper <drepper@cygnus.com> * nss/getXXbyYY_r.c: Include assert.h. * nss/getXXbyYY.c: Likewise.
65 lines
1.6 KiB
C
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 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_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;
|
|
}
|