use jni to determine the tested file support birth time or not

make/test/JtregNativeJdk.gmk

@@ -114,6 +114,8 @@ ifeq ($(call isTargetOs, linux), true)
  # stripping during the test libraries' build.
  BUILD_JDK_JTREG_LIBRARIES_CFLAGS_libFib := -g
  BUILD_JDK_JTREG_LIBRARIES_STRIP_SYMBOLS_libFib := false
+ # nio tests' libCreationTimeHelper native needs -ldl linker flag
+ BUILD_JDK_JTREG_LIBRARIES_LDFLAGS_libCreationTimeHelper := -ldl
 endif
 
 ifeq ($(ASAN_ENABLED), true)

test/jdk/java/nio/file/attribute/BasicFileAttributeView/CreationTime.java

@@ -108,13 +108,8 @@ static void test(Path top) throws IOException {
  supportsCreationTimeWrite = true;
  }
  } else if (Platform.isLinux()) {
- // Creation time read depends on statx system call support and on the file
- // system storing the birth time. The tmpfs/nfs/ext3 etc. file system type does not store
- // the birth time, that depends the linux kernel version.
- boolean statxIsPresent = Linker.nativeLinker().defaultLookup().find("statx").isPresent();
- if (statxIsPresent && supportBirthTimeOnLinux(file)) {
- supportsCreationTimeRead = true;
- }
+ // Creation time read depends on statx system call support
+ supportsCreationTimeRead = CreationTimeHelper.linuxIsCreationTimeSupported();
  // Creation time updates are not supported on Linux
  supportsCreationTimeWrite = false;
  }
@@ -148,24 +143,6 @@ static void test(Path top) throws IOException {
  }
  }
 
- /**
- * read the output of linux command `stat -c "%w" file`, if the output is "-",
- * then the file system doesn't support birth time
- */
- public static boolean supportBirthTimeOnLinux(Path file) {
- try {
- String filePath = file.toAbsolutePath().toString();
- ProcessBuilder pb = new ProcessBuilder("stat", "-c", "%w", filePath);
- pb.redirectErrorStream(true);
- Process p = pb.start();
- BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
- String l = b.readLine();
- if (l != null && l.equals("-")) { return false; }
- } catch(Exception e) {
- }
- return true;
- }
-
  public static void main(String[] args) throws IOException {
  // create temporary directory to run tests
  Path dir;

test/jdk/java/nio/file/attribute/BasicFileAttributeView/CreationTimeHelper.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2023, Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+public class CreationTimeHelper {
+
+ static {
+ System.loadLibrary("CreationTimeHelper");
+ }
+
+ // Helper so as to determine 'statx' support on the runtime system
+ static native boolean linuxIsCreationTimeSupported();
+}

test/jdk/java/nio/file/attribute/BasicFileAttributeView/libCreationTimeHelper.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2023, Red Hat, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+#include "jni.h"
+#if defined(__linux__)
+#include <dlfcn.h>
+#endif
+
+// static native boolean linuxIsCreationTimeSupported()
+JNIEXPORT jboolean JNICALL
+Java_CreationTimeHelper_linuxIsCreationTimeSupported(JNIEnv *env, jclass cls)
+{
+#if defined(__linux__)
+ void* statx_func = dlsym(RTLD_DEFAULT, "statx");
+ return statx_func != NULL ? JNI_TRUE : JNI_FALSE;
+#else
+ return JNI_FALSE;
+#endif
+}