Add renameat2 function [BZ #17662]

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.

1 files changed, 3 insertions, 0 deletions

diff --git a/include/stdio.h b/include/stdio.h
index f140813ad6..3ba0edc924 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -237,5 +237,8 @@ __putc_unlocked (int __c, FILE *__stream)
 }
 #  endif
 
+extern __typeof (renameat) __renameat;
+libc_hidden_proto (__renameat)
+
 # endif /* not _ISOMAC */
 #endif /* stdio.h */