1 /* Linux implementation for renameat2 function.
2 Copyright (C) 2018-2021 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 <https://www.gnu.org/licenses/>. */
18
19 #include <errno.h>
20 #include <stdio.h>
21 #include <sysdep.h>
22
23 int
__renameat2(int oldfd,const char * old,int newfd,const char * new,unsigned int flags)24 __renameat2 (int oldfd, const char *old, int newfd, const char *new,
25 unsigned int flags)
26 {
27 #if !defined (__NR_renameat) || defined (__ASSUME_RENAMEAT2)
28 return INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);
29 #else
30 if (flags == 0)
31 return __renameat (oldfd, old, newfd, new);
32
33 /* For non-zero flags, try the renameat2 system call. */
34 int ret = INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);
35 if (ret != -1 || errno != ENOSYS)
36 /* Preserve non-error/non-ENOSYS return values. */
37 return ret;
38
39 /* No kernel support for renameat2. All flags are unknown. */
40 __set_errno (EINVAL);
41 return -1;
42 #endif
43 }
44 libc_hidden_def (__renameat2)
45 weak_alias (__renameat2, renameat2)
46