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/* Unlock the slave side of a pseudo-terminal from its master side.
Copyright (C) 1998, 2010-2023 Free Software Foundation, Inc.
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
int
unlockpt (int fd)
{
/* Platforms which have the TIOCSPTLCK ioctl (Linux) already have the
unlockpt function. */
#if HAVE_REVOKE
/* Mac OS X 10.3, OpenBSD 3.8 do not have the unlockpt function, but they
have revoke(). */
char *name = ptsname (fd);
if (name == NULL)
return -1;
return revoke (name);
#else
/* Assume that the slave side of a pseudo-terminal is already unlocked
by default. */
if (fcntl (fd, F_GETFD) < 0)
return -1;
return 0;
#endif
}
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