copy_file_range: New function to copy file data

The semantics are based on the Linux system call, but a very close
emulation in user space is provided.

1 files changed, 30 insertions, 0 deletions

diff --git a/io/tst-copy_file_range-compat.c b/io/tst-copy_file_range-compat.c
new file mode 100644
index 0000000000..eb737946d9
--- /dev/null
+++ b/io/tst-copy_file_range-compat.c
@@ -0,0 +1,30 @@
+/* Test the fallback implementation of copy_file_range.
+   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/>.  */
+
+/* Get the declaration of the official copy_of_range function.  */
+#include <unistd.h>
+
+/* Compile a local version of copy_file_range.  */
+#define COPY_FILE_RANGE_DECL static
+#define COPY_FILE_RANGE copy_file_range_compat
+#include <io/copy_file_range-compat.c>
+
+/* Re-use the test, but run it against copy_file_range_compat defined
+   above.  */
+#define copy_file_range copy_file_range_compat
+#include "tst-copy_file_range.c"