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43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/* grantpt implementation for Linux.
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Copyright (C) 1998-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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int
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grantpt (int fd)
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{
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/* Without pt_chown on Linux, we have delegated the creation of the
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pty node with the right group and permission mode to the kernel, and
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non-root users are unlikely to be able to change it. Therefore let's
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consider that POSIX enforcement is the responsibility of the whole
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system and not only the GNU libc. */
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/* Verify that fd refers to a ptmx descriptor. */
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unsigned int ptyno;
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int ret = __ioctl (fd, TIOCGPTN, &ptyno);
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if (ret != 0 && errno == ENOTTY)
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/* POSIX requires EINVAL instead of ENOTTY provided by the kernel. */
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__set_errno (EINVAL);
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return ret;
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}
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libc_hidden_def (grantpt)
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