glibc/sysdeps/mach/hurd/kernel-features.h

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/* Set flags signalling availability of certain operating system features.
Copyright (C) 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* This file can define __ASSUME_* macros checked by certain source files.
Almost none of these are used outside of sysdeps/unix/sysv/linux code.
But those referring to POSIX-level features like O_* flags can be. */
#include <fcntl.h>
/* If a system defines the O_CLOEXEC constant but it is sometimes ignored,
it must override this file to define __ASSUME_O_CLOEXEC conditionally
(or not at all) to indicate when O_CLOEXEC actually works. */
#ifdef O_CLOEXEC
# define __ASSUME_O_CLOEXEC 1
#endif