am 389a440a: Backport ParcelFileDescriptor.createPipe() from master.

Merge commit '389a440ad13f7b16e8f7c7f1670bdd55f1e2112a' into gingerbread-plus-aosp

* commit '389a440ad13f7b16e8f7c7f1670bdd55f1e2112a':
  Backport ParcelFileDescriptor.createPipe() from master.

1 files changed, 19 insertions, 0 deletions

diff --git a/core/java/android/os/ParcelFileDescriptor.java b/core/java/android/os/ParcelFileDescriptor.java
index 9d213b344dc8..d853f1375680 100644
--- a/core/java/android/os/ParcelFileDescriptor.java
+++ b/core/java/android/os/ParcelFileDescriptor.java
@@ -134,6 +134,25 @@ public class ParcelFileDescriptor implements Parcelable {
     private static native FileDescriptor getFileDescriptorFromSocket(Socket socket);
 
     /**
+     * Create two ParcelFileDescriptors structured as a data pipe.  The first
+     * ParcelFileDescriptor in the returned array is the read side; the second
+     * is the write side.
+     */
+    public static ParcelFileDescriptor[] createPipe() throws IOException {
+        FileDescriptor[] fds = new FileDescriptor[2];
+        int res = createPipeNative(fds);
+        if (res == 0) {
+            ParcelFileDescriptor[] pfds = new ParcelFileDescriptor[2];
+            pfds[0] = new ParcelFileDescriptor(fds[0]);
+            pfds[1] = new ParcelFileDescriptor(fds[1]);
+            return pfds;
+        }
+        throw new IOException("Unable to create pipe: errno=" + -res);
+    }
+
+    private static native int createPipeNative(FileDescriptor[] outFds);
+
+    /**
      * Retrieve the actual FileDescriptor associated with this object.
      * 
      * @return Returns the FileDescriptor associated with this object.