1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
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  23 
  24 /* @test
  25  * @bug 8181493 8231174
  26  * @summary Verify that nanosecond precision is maintained for file timestamps
  27  * @requires (os.family == "linux") | (os.family == "mac") | (os.family == "windows")
  28  * @modules java.base/sun.nio.fs:+open
  29  */
  30 
  31 import java.io.IOException;
  32 import java.lang.reflect.Method;
  33 import java.nio.file.Files;
  34 import java.nio.file.FileStore;
  35 import java.nio.file.Path;
  36 import java.nio.file.attribute.BasicFileAttributes;
  37 import java.nio.file.attribute.BasicFileAttributeView;
  38 import java.nio.file.attribute.FileTime;
  39 import java.util.Set;
  40 import java.util.concurrent.TimeUnit;
  41 
  42 public class SetTimesNanos {
  43     private static final boolean IS_WINDOWS =
  44         System.getProperty("os.name").startsWith("Windows");
  45 
  46     public static void main(String[] args) throws Exception {
  47         if (!IS_WINDOWS) {
  48             // Check whether futimens() system call is supported
  49             Class unixNativeDispatcherClass =
  50                 Class.forName("sun.nio.fs.UnixNativeDispatcher");
  51             Method futimensSupported =
  52                 unixNativeDispatcherClass.getDeclaredMethod("futimensSupported");
  53             futimensSupported.setAccessible(true);
  54             if (!(boolean)futimensSupported.invoke(null)) {
  55                 System.err.println("futimens() not supported; skipping test");
  56                 return;
  57             }
  58         }
  59 
  60         Path dirPath = Path.of("test");
  61         Path dir = Files.createDirectory(dirPath);
  62         FileStore store = Files.getFileStore(dir);
  63         System.out.format("FileStore: \"%s\" on %s (%s)%n",
  64             dir, store.name(), store.type());
  65 
  66         Set<String> testedTypes = IS_WINDOWS ?
  67             Set.of("NTFS") : Set.of("apfs", "ext4", "xfs", "zfs");
  68         if (!testedTypes.contains(store.type())) {
  69             System.err.format("%s not in %s; skipping test", store.type(), testedTypes);
  70             return;
  71         }
  72 
  73         testNanos(dir);
  74 
  75         Path file = Files.createFile(dir.resolve("test.dat"));
  76         testNanos(file);
  77     }
  78 
  79     private static void testNanos(Path path) throws IOException {
  80         // Set modification and access times
  81         // Time stamp = "2017-01-01 01:01:01.123456789";
  82         long timeNanos = 1_483_261_261L*1_000_000_000L + 123_456_789L;
  83         FileTime pathTime = FileTime.from(timeNanos, TimeUnit.NANOSECONDS);
  84         BasicFileAttributeView view =
  85             Files.getFileAttributeView(path, BasicFileAttributeView.class);
  86         view.setTimes(pathTime, pathTime, null);
  87 
  88         // Windows file time resolution is 100ns so truncate
  89         if (IS_WINDOWS) {
  90             timeNanos = 100L*(timeNanos/100L);
  91         }
  92 
  93         // Read attributes
  94         BasicFileAttributes attrs =
  95             Files.readAttributes(path, BasicFileAttributes.class);
  96 
  97         // Check timestamps
  98         String[] timeNames = new String[] {"modification", "access"};
  99         FileTime[] times = new FileTime[] {attrs.lastModifiedTime(),
 100             attrs.lastAccessTime()};
 101         for (int i = 0; i < timeNames.length; i++) {
 102             long nanos = times[i].to(TimeUnit.NANOSECONDS);
 103             if (nanos != timeNanos) {
 104                 throw new RuntimeException("Expected " + timeNames[i] +
 105                     " timestamp to be '" + timeNanos + "', but was '" +
 106                     nanos + "'");
 107             }
 108         }
 109     }
 110 }