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/* grantpt implementation for Linux.
Copyright (C) 1998-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <termios.h>
int
grantpt (int fd)
{
/* Without pt_chown on Linux, we have delegated the creation of the
pty node with the right group and permission mode to the kernel, and
non-root users are unlikely to be able to change it. Therefore let's
consider that POSIX enforcement is the responsibility of the whole
system and not only the GNU libc. */
/* Verify that fd refers to a ptmx descriptor. */
unsigned int ptyno;
int ret = __ioctl (fd, TIOCGPTN, &ptyno);
if (ret != 0 && errno == ENOTTY)
/* POSIX requires EINVAL instead of ENOTTY provided by the kernel. */
__set_errno (EINVAL);
return ret;
}
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