38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
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/* Copyright (C) 1998-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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/* Unlock the slave pseudo terminal associated with the master pseudo
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terminal specified by FD. */
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int
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unlockpt (int fd)
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{
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int unlock = 0;
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int ret = __ioctl (fd, TIOCSPTLCK, &unlock);
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if (ret != 0 && errno == ENOTTY)
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/* POSIX mandates EINVAL for non-ptmx descriptors. */
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__set_errno (EINVAL);
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return ret;
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}
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libc_hidden_def (unlockpt)
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