* rt/Versions (librt): Export __mq_open_2@@GLIBC_2.7.

* rt/Makefile (headers): Add bits/mqueue2.h.
	* rt/mqueue.h: Include bits/mqueue2.h if -D_FORTIFY_SOURCE=2,
	optimizing with GCC and __va_arg_pack_len is defined.
	* rt/bits/mqueue2.h: New file.
	* rt/mq_open.c (__mq_open): Renamed from mq_open.
	(mq_open): New strong_alias.
	(__mq_open_2): New function.
	* sysdeps/unix/sysv/linux/mq_open.c (__mq_open): Renamed from mq_open.
	(mq_open): New strong_alias.
	(__mq_open_2): New function.
	* debug/Versions (libc): Export __fortify_fail@@GLIBC_PRIVATE.
	* Versions.def (librt): Add GLIBC_2.7 version.
	* debug/fortify_fail.c (__fortify_fail): Add libc_hidden_def.
	* include/stdio.h (__fortify_fail): Add libc_hidden_proto.

	* misc/sys/cdefs.h (__errordecl, __va_arg_pack_len): Define.
	* io/fcntl.h: Include bits/fcntl2.h when __va_arg_pack_len
	is defined rather than when not C++.
	* io/bits/fcntl2.h (__open_alias, __open64_alias, __openat_alias,
	__openat64_alias): New redirects.
	(__open_too_many_args, __open_missing_mode, __open64_too_many_args,
	__open64_missing_mode, __openat_too_many_args, __openat_missing_mode,
	__openat64_too_many_args, __openat64_missing_mode): New __errordecls.
	(open, open64, openat, openat64): Rewrite as __extern_always_inline
	functions instead of function-like macros.

rt/Makefile

@@ -1,4 +1,4 @@
-# Copyright (C) 1997-2004, 2006 Free Software Foundation, Inc.
+# Copyright (C) 1997-2004, 2006, 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
@@ -21,7 +21,7 @@
 #
 subdir	:= rt
 
-headers	:= aio.h mqueue.h bits/mqueue.h
+headers	:= aio.h mqueue.h bits/mqueue.h bits/mqueue2.h
 
 aio-routines   := aio_cancel aio_error aio_fsync aio_misc aio_read	\
 		  aio_read64 aio_return aio_suspend aio_write		\

rt/Versions

@@ -22,4 +22,7 @@ librt {
     mq_open; mq_close; mq_unlink; mq_getattr; mq_setattr;
     mq_notify; mq_send; mq_receive; mq_timedsend; mq_timedreceive;
   }
+  GLIBC_2.7 {
+   __mq_open_2;
+  }
 }

rt/bits/mqueue2.h

@@ -0,0 +1,56 @@
+/* Checking macros for mq functions.
+   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.  */
+
+#ifndef	_FCNTL_H
+# error "Never include <bits/mqueue2.h> directly; use <mqueue.h> instead."
+#endif
+
+/* Check that calls to mq_open with O_CREAT set have an appropriate third and fourth
+   parameter.  */
+extern mqd_t mq_open (__const char *__name, int __oflag, ...)
+     __THROW __nonnull ((1));
+extern mqd_t __mq_open_2 (__const char *__name, int __oflag) __nonnull ((1));
+extern mqd_t __REDIRECT (__mq_open_alias, (__const char *__name, int __oflag, ...),
+			 mq_open) __nonnull ((1));
+__errordecl (__mq_open_wrong_number_of_args,
+	     "mq_open can be called either with 2 or 4 arguments");
+__errordecl (__mq_open_missing_mode_and_attr,
+	     "mq_open with O_CREAT in second argument needs 4 arguments");
+
+__extern_always_inline mqd_t
+mq_open (__const char *__name, int __oflag, ...)
+{
+  if (__va_arg_pack_len () != 0 && __va_arg_pack_len () != 2)
+    __mq_open_wrong_number_of_args ();
+
+  if (__builtin_constant_p (__oflag))
+    {
+      if ((__oflag & O_CREAT) != 0 && __va_arg_pack_len () == 0)
+	{
+	  __mq_open_missing_mode_and_attr ();
+	  return __mq_open_2 (__name, __oflag);
+	}
+      return __mq_open_alias (__name, __oflag, __va_arg_pack ());
+    }
+
+  if (__va_arg_pack_len () == 0)
+    return __mq_open_2 (__name, __oflag);
+
+  return __mq_open_alias (__name, __oflag, __va_arg_pack ());
+}

rt/mq_open.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2004, 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
@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <mqueue.h>
+#include <stdio.h>
 
 /* Establish connection between a process and a message queue NAME and
    return message queue descriptor or (mqd_t) -1 on error.  OFLAG determines
@@ -27,10 +28,21 @@
    attributes.  If the fourth argument is NULL, default attributes are
    used.  */
 mqd_t
-mq_open (const char *name, int oflag, ...)
+__mq_open (const char *name, int oflag, ...)
 {
   __set_errno (ENOSYS);
   return (mqd_t) -1;
 }
+strong_alias (__mq_open, mq_open);
 stub_warning (mq_open)
+
+mqd_t
+__mq_open_2 (const char *name, int oflag)
+{
+  if (oflag & O_CREAT)
+    __fortify_fail ("invalid mq_open call: O_CREAT without mode and attr");
+
+  return __mq_open (name, oflag);
+}
+stub_warning (__mq_open_2)
 #include <stub-tag.h>

rt/mqueue.h

@@ -90,6 +90,12 @@ extern int mq_timedsend (mqd_t __mqdes, __const char *__msg_ptr,
   __nonnull ((2, 5));
 #endif
 
+/* Define some inlines helping to catch common problems.  */
+#if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline \
+    && defined __va_arg_pack_len
+# include <bits/mqueue2.h>
+#endif
+
 __END_DECLS
 
 #endif /* mqueue.h */