From 2b203c461655eb871a3e6f7f04dc6dce00a88092 Mon Sep 17 00:00:00 2001
From: Benjamin Sergeant <bsergean@gmail.com>
Date: Wed, 7 Nov 2018 12:24:08 -0800
Subject: [PATCH] Add missing files ...

---
 ixwebsocket/IXEventFd.cpp | 82 +++++++++++++++++++++++++++++++++++++++
 ixwebsocket/IXEventFd.h   | 23 +++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 ixwebsocket/IXEventFd.cpp
 create mode 100644 ixwebsocket/IXEventFd.h

diff --git a/ixwebsocket/IXEventFd.cpp b/ixwebsocket/IXEventFd.cpp
new file mode 100644
index 00000000..607d1cba
--- /dev/null
+++ b/ixwebsocket/IXEventFd.cpp
@@ -0,0 +1,82 @@
+/*
+ *  IXEventFd.cpp
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
+ */
+
+//
+// Linux/Android has a special type of virtual files. select(2) will react
+// when reading/writing to those files, unlike closing sockets.
+//
+// https://linux.die.net/man/2/eventfd
+// http://www.sourcexr.com/articles/2013/10/26/lightweight-inter-process-signaling-with-eventfd
+//
+// eventfd was added in Linux kernel 2.x, and our oldest Android (Kitkat 4.4)
+// is on Kernel 3.x
+//
+// cf Android/Kernel table here 
+// https://android.stackexchange.com/questions/51651/which-android-runs-which-linux-kernel
+//
+
+#include "IXEventFd.h"
+
+#ifdef __linux__
+# include <sys/eventfd.h>
+#endif
+
+#ifndef _WIN32
+#include <unistd.h> // for write
+#endif
+
+namespace ix 
+{
+    EventFd::EventFd() : 
+        _eventfd(-1)
+    {
+#ifdef __linux__
+        _eventfd = eventfd(0, 0);
+#endif
+    }
+
+    EventFd::~EventFd()
+    {
+#ifdef __linux__
+        ::close(_eventfd);
+#endif
+    }
+
+    bool EventFd::notify()
+    {
+#if defined(__linux__)
+        if (_eventfd == -1) return false;
+
+        // select will wake up when a non-zero value is written to our eventfd
+        uint64_t value = 1;
+
+        // we should write 8 bytes for an uint64_t
+        return write(_eventfd, &value, sizeof(value)) == 8;
+#else
+        return true;
+#endif
+    }
+
+    bool EventFd::clear()
+    {
+#if defined(__linux__)
+        if (_eventfd == -1) return false;
+
+        // 0 is a special value ; select will not wake up 
+        uint64_t value = 0;
+
+        // we should write 8 bytes for an uint64_t
+        return write(_eventfd, &value, sizeof(value)) == 8;
+#else
+        return true;
+#endif
+    }
+
+    int EventFd::getFd()
+    {
+        return _eventfd;
+    }
+}
diff --git a/ixwebsocket/IXEventFd.h b/ixwebsocket/IXEventFd.h
new file mode 100644
index 00000000..3c263a83
--- /dev/null
+++ b/ixwebsocket/IXEventFd.h
@@ -0,0 +1,23 @@
+/*
+ *  IXEventFd.h
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
+ */
+
+#pragma once
+
+namespace ix 
+{
+    class EventFd {
+    public:
+        EventFd();
+        virtual ~EventFd();
+
+        bool notify();
+        bool clear();
+        int getFd();
+
+    private:
+        int _eventfd;
+    };
+}