mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/* grantpt implementation for Linux.
|
|
Copyright (C) 1998-2021 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;
|
|
}
|
|
libc_hidden_def (grantpt)
|