[libc][stdio] implement rename via SYS_renameat2 (#86140)
SYS_rename may be unavailable on architectures such as aarch64 and
riscv.
rename can be implemented in terms of SYS_rename, SYS_renameat, or
SYS_renameat2. I don't have a full picture of the history here, but it
seems
that SYS_renameat might also be unavailable on some platforms.
`man 2 rename` mentions that SYS_renameat2 was added in Linux 3.15. We
don't
need to support such ancient kernel versions prior.
Link: #84980
Link: #85068
GitOrigin-RevId: 6eff53b4f07c1d8f6ae271254499ec087f40cc83
diff --git a/src/stdio/linux/rename.cpp b/src/stdio/linux/rename.cpp
index f3d6842..379a6ef 100644
--- a/src/stdio/linux/rename.cpp
+++ b/src/stdio/linux/rename.cpp
@@ -7,6 +7,7 @@
//===----------------------------------------------------------------------===//
#include "src/stdio/rename.h"
+#include "include/llvm-libc-macros/linux/fcntl-macros.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/errno/libc_errno.h"
@@ -15,7 +16,8 @@
namespace LIBC_NAMESPACE {
LLVM_LIBC_FUNCTION(int, rename, (const char *oldpath, const char *newpath)) {
- int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_rename, oldpath, newpath);
+ int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_renameat2, AT_FDCWD, oldpath,
+ AT_FDCWD, newpath, 0);
if (ret >= 0)
return 0;
diff --git a/test/src/stdio/rename_test.cpp b/test/src/stdio/rename_test.cpp
index 3ed39fe..a5dd734 100644
--- a/test/src/stdio/rename_test.cpp
+++ b/test/src/stdio/rename_test.cpp
@@ -6,8 +6,8 @@
//
//===----------------------------------------------------------------------===//
-#include "include/llvm-libc-macros/linux/unistd-macros.h"
#include "include/llvm-libc-macros/linux/sys-stat-macros.h"
+#include "include/llvm-libc-macros/linux/unistd-macros.h"
#include "src/errno/libc_errno.h"
#include "src/fcntl/open.h"
#include "src/stdio/rename.h"
