You can't fsync(2) /dev/urandom...
...so don't even try. Doing so leads to this:
W/EntropyService( 1586): unable to load initial entropy (first boot?)
W/EntropyService( 1586): java.io.SyncFailedException: fsync failed: EINVAL (Invalid argument)
W/EntropyService( 1586): at java.io.FileDescriptor.sync(FileDescriptor.java:73)
W/EntropyService( 1586): at java.io.RandomAccessFile.write(RandomAccessFile.java:694)
W/EntropyService( 1586): at java.io.RandomAccessFile.write(RandomAccessFile.java:676)
W/EntropyService( 1586): at com.android.server.RandomBlock.toDataOut(RandomBlock.java:88)
W/EntropyService( 1586): at com.android.server.RandomBlock.toFile(RandomBlock.java:70)
W/EntropyService( 1586): at com.android.server.EntropyService.loadInitialEntropy(EntropyService.java:99)
W/EntropyService( 1586): at com.android.server.EntropyService.<init>(EntropyService.java:86)
W/EntropyService( 1586): at com.android.server.EntropyService.<init>(EntropyService.java:76)
W/EntropyService( 1586): at com.android.server.ServerThread.run(SystemServer.java:139)
W/EntropyService( 1586): Caused by: libcore.io.ErrnoException: fsync failed: EINVAL (Invalid argument)
W/EntropyService( 1586): at libcore.io.Posix.fsync(Native Method)
W/EntropyService( 1586): at libcore.io.BlockGuardOs.fsync(BlockGuardOs.java:39)
W/EntropyService( 1586): at java.io.FileDescriptor.sync(FileDescriptor.java:71)
W/EntropyService( 1586): ... 8 more
Change-Id: I598a9456eccec0ca087f1568d47b6b8e531de8a8
diff --git a/services/java/com/android/server/RandomBlock.java b/services/java/com/android/server/RandomBlock.java
index cc22bd9..e5d7301 100644
--- a/services/java/com/android/server/RandomBlock.java
+++ b/services/java/com/android/server/RandomBlock.java
@@ -62,11 +62,11 @@
return retval;
}
- void toFile(String filename) throws IOException {
+ void toFile(String filename, boolean sync) throws IOException {
if (DEBUG) Slog.v(TAG, "writing to file " + filename);
RandomAccessFile out = null;
try {
- out = new RandomAccessFile(filename, "rws");
+ out = new RandomAccessFile(filename, sync ? "rws" : "rw");
toDataOut(out);
truncateIfPossible(out);
} finally {