diff --git a/related_info/lec2/Makefile b/related_info/lec2/Makefile
new file mode 100644
index 0000000..1c3bb74
--- /dev/null
+++ b/related_info/lec2/Makefile
@@ -0,0 +1,8 @@
+all: hello.c
+	echo "compile and watch the syscalls from hello"
+	gcc -o hello hello.c
+	strace -c ./hello
+	echo "watch the interrupts in linux"
+	more /proc/interrupts
+clean:
+	rm ./hello
diff --git a/related_info/lec2/hello b/related_info/lec2/hello
new file mode 100755
index 0000000..37ea79c
Binary files /dev/null and b/related_info/lec2/hello differ
diff --git a/related_info/lec2/hello.c b/related_info/lec2/hello.c
new file mode 100644
index 0000000..5b9f577
--- /dev/null
+++ b/related_info/lec2/hello.c
@@ -0,0 +1,5 @@
+#include <stdio.h>
+void main(void)
+{
+  printf("hello world\n");
+}