add main branch files

userspace/su/.gitignore

@@ -0,0 +1,2 @@
+/obj
+/libs

userspace/su/jni/Android.mk

@@ -0,0 +1,6 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := su
+LOCAL_SRC_FILES := su.c
+include $(BUILD_EXECUTABLE)

userspace/su/jni/Application.mk

@@ -0,0 +1,3 @@
+APP_ABI := arm64-v8a x86_64
+APP_PLATFORM := android-24
+APP_STL := none

userspace/su/jni/su.c

@@ -0,0 +1,11 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/prctl.h>
+
+// This is a simple example. If you want a full-featured "su", please use "/data/adb/ksud debug su".
+int main(){
+    int32_t result = 0;
+    prctl(0xdeadbeef, 0, 0, 0, &result);
+    system("/system/bin/sh");
+    return 0;
+}