-/* Copyright (C) 2011 Free Software Foundation, Inc.
+/* Copyright (C) 2011-2012 Free Software Foundation, Inc.
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
#include "cloexec.h"
+/* The code that uses CMSG_FIRSTHDR is enabled on
+ Linux, MacOS X, FreeBSD, OpenBSD, NetBSD, AIX, OSF/1, Cygwin.
+ The code that uses HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS is enabled on
+ HP-UX, IRIX, Solaris. */
+
+/* MSG_CMSG_CLOEXEC is defined only on Linux, as of 2011. */
#ifndef MSG_CMSG_CLOEXEC
# define MSG_CMSG_CLOEXEC 0
#endif