Mercurial > gnulib
view lib/unlockpt.c @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 00:01:47 +0100 |
parents | b06060465f09 |
children |
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/* Unlock the slave side of a pseudo-terminal from its master side. Copyright (C) 1998, 2010-2019 Free Software Foundation, Inc. Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU 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 }