1 files changed, 49 insertions, 0 deletions

diff --git a/luni/src/main/java/android/system/StructPollfd.java b/luni/src/main/java/android/system/StructPollfd.java
new file mode 100644
index 0000000..b812612
--- /dev/null
+++ b/luni/src/main/java/android/system/StructPollfd.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.system;
+
+import java.io.FileDescriptor;
+import libcore.util.Objects;
+
+/**
+ * Used as an in/out parameter to {@link Os#poll}.
+ * Corresponds to C's {@code struct pollfd} from {@code <poll.h>}.
+ */
+public final class StructPollfd {
+  /** The file descriptor to poll. */
+  public FileDescriptor fd;
+
+  /**
+   * The events we're interested in. POLLIN corresponds to being in select(2)'s read fd set,
+   * POLLOUT to the write fd set.
+   */
+  public short events;
+
+  /** The events that actually happened. */
+  public short revents;
+
+  /**
+   * A non-standard extension that lets callers conveniently map back to the object
+   * their fd belongs to. This is used by Selector, for example, to associate each
+   * FileDescriptor with the corresponding SelectionKey.
+   */
+  public Object userData;
+
+  @Override public String toString() {
+    return Objects.toString(this);
+  }
+}