2 files changed, 18 insertions, 0 deletions
diff --git a/test/util/fs_util.cc b/test/util/fs_util.cc
index b16055dd8..5f1ce0d8a 100644
--- a/test/util/fs_util.cc
+++ b/test/util/fs_util.cc
@@ -663,5 +663,21 @@ PosixErrorOr<bool> IsOverlayfs(const std::string& path) {
   return stat.f_type == OVERLAYFS_SUPER_MAGIC;
 }
 
+PosixError CheckSameFile(const FileDescriptor& fd1, const FileDescriptor& fd2) {
+  struct stat stat_result1, stat_result2;
+  int res = fstat(fd1.get(), &stat_result1);
+  if (res < 0) {
+    return PosixError(errno, absl::StrCat("fstat ", fd1.get()));
+  }
+
+  res = fstat(fd2.get(), &stat_result2);
+  if (res < 0) {
+    return PosixError(errno, absl::StrCat("fstat ", fd2.get()));
+  }
+  EXPECT_EQ(stat_result1.st_dev, stat_result2.st_dev);
+  EXPECT_EQ(stat_result1.st_ino, stat_result2.st_ino);
+
+  return NoError();
+}
 }  // namespace testing
 }  // namespace gvisor
diff --git a/test/util/fs_util.h b/test/util/fs_util.h
index c99cf5eb7..2190c3bca 100644
--- a/test/util/fs_util.h
+++ b/test/util/fs_util.h
@@ -191,6 +191,8 @@ PosixErrorOr<bool> IsTmpfs(const std::string& path);
 // IsOverlayfs returns true if the file at path is backed by overlayfs.
 PosixErrorOr<bool> IsOverlayfs(const std::string& path);
 
+PosixError CheckSameFile(const FileDescriptor& fd1, const FileDescriptor& fd2);
+
 namespace internal {
 // Not part of the public API.
 std::string JoinPathImpl(std::initializer_list<absl::string_view> paths);