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/* Linux implementation of copy_file_range.
Copyright (C) 2017-2018 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/>. */
#include <errno.h>
#include <sysdep-cancel.h>
#include <unistd.h>
/* Include the fallback implementation. */
#ifndef __ASSUME_COPY_FILE_RANGE
#define COPY_FILE_RANGE_DECL static
#define COPY_FILE_RANGE copy_file_range_compat
#include <io/copy_file_range-compat.c>
#endif
ssize_t
copy_file_range (int infd, __off64_t *pinoff,
int outfd, __off64_t *poutoff,
size_t length, unsigned int flags)
{
#ifdef __NR_copy_file_range
ssize_t ret = SYSCALL_CANCEL (copy_file_range, infd, pinoff, outfd, poutoff,
length, flags);
# ifndef __ASSUME_COPY_FILE_RANGE
if (ret == -1 && errno == ENOSYS)
ret = copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
# endif
return ret;
#else /* !__NR_copy_file_range */
return copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
#endif
}
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