45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* Unlock the slave side of a pseudo-terminal from its master side.
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Copyright (C) 1998, 2010-2024 Free Software Foundation, Inc.
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Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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int
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unlockpt (int fd)
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{
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/* Platforms which have the TIOCSPTLCK ioctl (Linux) already have the
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unlockpt function. */
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#if HAVE_REVOKE
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/* Mac OS X 10.3, OpenBSD 3.8 do not have the unlockpt function, but they
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have revoke(). */
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char *name = ptsname (fd);
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if (name == NULL)
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return -1;
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return revoke (name);
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#else
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/* Assume that the slave side of a pseudo-terminal is already unlocked
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by default. */
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if (fcntl (fd, F_GETFD) < 0)
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return -1;
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return 0;
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#endif
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}
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