/* Copyright (C) 1998 Free Software Foundation, Inc.
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/* Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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 Library General Public License as
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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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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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/ioctl.h>
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#include <termios.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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/* Unlock the slave pseudo terminal associated with the master pseudo
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terminal specified by FD. */
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terminal specified by FD. */
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int
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int
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unlockpt (int fd)
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unlockpt (int fd)
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{
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{
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#ifdef TIOCSPTLCK
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#ifdef TIOCSPTLCK
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int save_errno = errno;
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int save_errno = errno;
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int unlock = 0;
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int unlock = 0;
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if (ioctl (fd, TIOCSPTLCK, &unlock))
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if (ioctl (fd, TIOCSPTLCK, &unlock))
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{
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{
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if (errno == EINVAL)
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if (errno == EINVAL)
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{
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{
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errno = save_errno;
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errno = save_errno;
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return 0;
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return 0;
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}
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}
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else
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else
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return -1;
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return -1;
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}
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}
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#endif
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#endif
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/* If we have no TIOCSPTLCK ioctl, all slave pseudo terminals are
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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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unlocked by default. */
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return 0;
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return 0;
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}
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}
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