1/* Linux implementation of copy_file_range.
2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <sysdep-cancel.h>
21#include <unistd.h>
22
23/* Include the fallback implementation. */
24#ifndef __ASSUME_COPY_FILE_RANGE
25#define COPY_FILE_RANGE_DECL static
26#define COPY_FILE_RANGE copy_file_range_compat
27#include <io/copy_file_range-compat.c>
28#endif
29
30ssize_t
31copy_file_range (int infd, __off64_t *pinoff,
32 int outfd, __off64_t *poutoff,
33 size_t length, unsigned int flags)
34{
35#ifdef __NR_copy_file_range
36 ssize_t ret = SYSCALL_CANCEL (copy_file_range, infd, pinoff, outfd, poutoff,
37 length, flags);
38# ifndef __ASSUME_COPY_FILE_RANGE
39 if (ret == -1 && errno == ENOSYS)
40 ret = copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
41# endif
42 return ret;
43#else /* !__NR_copy_file_range */
44 return copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
45#endif
46}
47