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d6da5cb6a8
The implementation falls back to renameat if renameat2 is not available in the kernel (or in the kernel headers) and the flags argument is zero. Without kernel support, a non-zero argument returns EINVAL, not ENOSYS. This mirrors what the kernel does for invalid renameat2 flags.
45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/* Linux implementation for renameat2 function.
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Copyright (C) 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 <stdio.h>
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#include <sysdep.h>
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int
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renameat2 (int oldfd, const char *old, int newfd, const char *new,
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unsigned int flags)
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{
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#if !defined (__NR_renameat) || defined (__ASSUME_RENAMEAT2)
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return INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);
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#else
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if (flags == 0)
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return __renameat (oldfd, old, newfd, new);
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# ifdef __NR_renameat2
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/* For non-zero flags, try the renameat2 system call. */
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int ret = INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);
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if (ret != -1 || errno != ENOSYS)
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/* Preserve non-error/non-ENOSYS return values. */
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return ret;
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# endif
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/* No kernel (header) support for renameat2. All flags are
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unknown. */
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__set_errno (EINVAL);
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return -1;
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#endif
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}
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