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glibc  2.9
kernel-features.h
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00001 /* Set flags signalling availability of certain operating system features.
00002    Copyright (C) 2007 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 /* This file can define __ASSUME_* macros checked by certain source files.
00021    Almost none of these are used outside of sysdeps/unix/sysv/linux code.
00022    But those referring to POSIX-level features like O_* flags can be.  */
00023 
00024 #include <fcntl.h>
00025 
00026 /* If a system defines the O_CLOEXEC constant but it is sometimes ignored,
00027    it must override this file to define __ASSUME_O_CLOEXEC conditionally
00028    (or not at all) to indicate when O_CLOEXEC actually works.  */
00029 #ifdef O_CLOEXEC
00030 # define __ASSUME_O_CLOEXEC 1
00031 #endif