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49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* Copyright (C) 1998-2020 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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/* 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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#ifdef TIOCSPTLCK
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int save_errno = errno;
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int unlock = 0;
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if (__ioctl (fd, TIOCSPTLCK, &unlock))
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{
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if (errno == EINVAL)
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{
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__set_errno (save_errno);
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return 0;
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}
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else
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return -1;
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}
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#endif
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/* If we have no TIOCSPTLCK ioctl, all slave pseudo terminals are
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unlocked by default. */
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return 0;
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}
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