Added mining on battery setting

src/base/kernel/Platform_unix.cpp

@@ -38,6 +38,7 @@
 #include <unistd.h>
 #include <uv.h>
 #include <thread>
+#include <fstream>
 
 
 #include "base/kernel/Platform.h"
@@ -146,3 +147,19 @@ void xmrig::Platform::setThreadPriority(int priority)
     }
 #   endif
 }
+
+
+bool xmrig::Platform::isOnBatteryPower()
+{
+    for (int i = 0; i <= 1; ++i) {
+        char buf[64];
+        snprintf(buf, 64, "/sys/class/power_supply/BAT%d/status", i);
+        std::ifstream f(buf);
+        if (f.is_open()) {
+            std::string status;
+            f >> status;
+            return (status == "Discharging");
+        }
+    }
+    return false;
+}