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/* Linux implementation of copy_file_range.
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sysdep-cancel.h>
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#include <unistd.h>
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/* Include the fallback implementation. */
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#ifndef __ASSUME_COPY_FILE_RANGE
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#define COPY_FILE_RANGE_DECL static
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#define COPY_FILE_RANGE copy_file_range_compat
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#include <io/copy_file_range-compat.c>
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#endif
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ssize_t
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copy_file_range (int infd, __off64_t *pinoff,
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int outfd, __off64_t *poutoff,
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size_t length, unsigned int flags)
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{
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#ifdef __NR_copy_file_range
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ssize_t ret = SYSCALL_CANCEL (copy_file_range, infd, pinoff, outfd, poutoff,
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length, flags);
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# ifndef __ASSUME_COPY_FILE_RANGE
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if (ret == -1 && errno == ENOSYS)
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ret = copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
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# endif
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return ret;
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#else /* !__NR_copy_file_range */
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return copy_file_range_compat (infd, pinoff, outfd, poutoff, length, flags);
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#endif
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}
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