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-rw-r--r--bits/uio-ext.h28
-rw-r--r--bits/uio_lim.h (renamed from bits/uio.h)13
2 files changed, 36 insertions, 5 deletions
diff --git a/bits/uio-ext.h b/bits/uio-ext.h
new file mode 100644
index 0000000000..cd4039cb61
--- /dev/null
+++ b/bits/uio-ext.h
@@ -0,0 +1,28 @@
+/* Operating system-specific extensions to sys/uio.h - generic version.
+   Copyright (C) 2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_UIO_EXT_H
+#define _BITS_UIO_EXT_H 1
+
+#ifndef _SYS_UIO_H
+# error "Never include <bits/uio-ext.h> directly; use <sys/uio.h> instead."
+#endif
+
+/* This operating system does not extend sys/uio.h.  */
+
+#endif /* sys/uio_ext.h */
diff --git a/bits/uio.h b/bits/uio_lim.h
index 96a3a71d42..63afbdcb3b 100644
--- a/bits/uio.h
+++ b/bits/uio_lim.h
@@ -1,4 +1,5 @@
-/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
+/* Implementation limits related to sys/uio.h - generic version.
+   Copyright (C) 2017 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
@@ -15,9 +16,11 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifndef _SYS_UIO_H
-# error "Never include <bits/uio.h> directly; use <sys/uio.h> instead."
-#endif
+#ifndef _BITS_UIO_LIM_H
+#define _BITS_UIO_LIM_H 1
 
+/* Maximum length of the 'struct iovec' array in a single call to
+   readv or writev.  If there is no limit, the macro is not defined.  */
+#undef __IOV_MAX
 
-#include <bits/types/struct_iovec.h>
+#endif