1 files changed, 53 insertions, 0 deletions
diff --git a/libc/bionic/eventfd.c b/libc/bionic/eventfd.c
new file mode 100644
index 000000000..fc7a6b9b6
--- /dev/null
+++ b/libc/bionic/eventfd.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/eventfd.h>
+#include <unistd.h>
+
+/* We duplicate the GLibc error semantics, which are poorly defined
+ * if the read() or write() does not return the proper number of bytes.
+ */
+int eventfd_read(int fd, eventfd_t *counter)
+{
+    int ret = read(fd, counter, sizeof(*counter));
+
+    if (ret == sizeof(*counter))
+        return 0;
+
+    return -1;
+}
+
+int eventfd_write(int fd, eventfd_t counter)
+{
+    int ret = write(fd, &counter, sizeof(counter));
+
+    if (ret == sizeof(counter))
+        return 0;
+
+    return -1;
+}