Add FileLog class.

src/log/FileLog.h

@@ -0,0 +1,50 @@
+/* XMRig
+ * Copyright 2010      Jeff Garzik <jgarzik@pobox.com>
+ * Copyright 2012-2014 pooler      <pooler@litecoinpool.org>
+ * Copyright 2014      Lucas Jones <https://github.com/lucasjones>
+ * Copyright 2014-2016 Wolf9466    <https://github.com/OhGodAPet>
+ * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
+ * Copyright 2016-2017 XMRig       <support@xmrig.com>
+ *
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __FILELOG_H__
+#define __FILELOG_H__
+
+
+#include <uv.h>
+
+
+#include "interfaces/ILogBackend.h"
+
+
+class FileLog : public ILogBackend
+{
+public:
+    FileLog(const char *fileName);
+
+    void message(int level, const char* fmt, va_list args) override;
+    void text(const char* fmt, va_list args) override;
+
+private:
+    static void onWrite(uv_fs_t *req);
+
+    void write(char *data, size_t size);
+
+    int m_file;
+};
+
+#endif /* __FILELOG_H__ */