diff --git a/twrp-functions.cpp b/twrp-functions.cpp
index fa2110a..85ce727 100644
--- a/twrp-functions.cpp
+++ b/twrp-functions.cpp
@@ -12,6 +12,7 @@
 #include <sys/sendfile.h>
 #include <sys/stat.h>
 #include <sys/vfs.h>
+#include "cutils/android_reboot.h"
 #include <iostream>
 #include <fstream>
 #include "twrp-functions.hpp"
@@ -374,6 +375,7 @@
         return __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, (void*) "bootloader");
     case rb_poweroff:
 		check_and_run_script("/sbin/poweroff.sh", "power off");
+		android_reboot(ANDROID_RB_POWEROFF, 0, 0);
         return reboot(RB_POWER_OFF);
     case rb_download:
 		check_and_run_script("/sbin/rebootdownload.sh", "reboot download");
@@ -449,6 +451,8 @@
 	dstfile << srcfile.rdbuf();
 	srcfile.close();
 	dstfile.close();
+	if (chmod(dst.c_str(), mode) != 0)
+		return -1;
 	return 0;
 }
 
@@ -472,3 +476,48 @@
 		return DT_SOCK;
 	return DT_UNKNOWN;
 }
+
+int TWFunc::read_file(string fn, string& results) {
+	ifstream file;
+	file.open(fn.c_str(), ios::in);
+	if (file.is_open()) {
+		file >> results;
+		file.close();
+		return 0;
+	}
+	LOGI("Cannot find file %s\n", fn.c_str());
+	return -1;
+}
+
+int TWFunc::write_file(string fn, string& line) {
+	FILE *file;
+	file = fopen(fn.c_str(), "w");
+	if (file != NULL) {
+		fwrite(line.c_str(), line.size(), 1, file);
+		fclose(file);
+		return 0;
+	}
+	LOGI("Cannot find file %s\n", fn.c_str());
+	return -1;
+}
+
+timespec TWFunc::timespec_diff(timespec& start, timespec& end)
+{
+        timespec temp;
+        if ((end.tv_nsec-start.tv_nsec)<0) {
+                temp.tv_sec = end.tv_sec-start.tv_sec-1;
+                temp.tv_nsec = 1000000000+end.tv_nsec-start.tv_nsec;
+        } else {
+                temp.tv_sec = end.tv_sec-start.tv_sec;
+                temp.tv_nsec = end.tv_nsec-start.tv_nsec;
+        }
+        return temp;
+}
+
+ int TWFunc::drop_caches(void) {
+        string file = "/proc/sys/vm/drop_caches";
+        string value = "3";
+        if (write_file(file, value) != 0)
+                return -1;
+        return 0;
+}