1/* Copyright (C) 1998-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <stdlib.h>
19#include <errno.h>
20
21/* Given a fd on a master pseudoterminal, clear a kernel lock so that
22 the slave can be opened. This is to avoid a race between opening the
23 master and calling grantpt() to take possession of the slave. */
24int
25unlockpt (int fd __attribute__ ((unused)))
26{
27 __set_errno (ENOSYS);
28 return -1;
29}
30
31stub_warning (unlockpt)
32

source code of glibc/login/unlockpt.c