remove debug output and add volatile test program

src/tracer.cpp

@@ -1,4 +1,6 @@
 #include "tracer.hpp"
+#include <cerrno>
+#include <cstring>
 #include <filesystem>
 #include <format>
 #include <fstream>
@@ -104,10 +106,11 @@ void Tracer::watch_variable(const std::string &exec_path, uint64_t address, size
     waitpid(pid, &status, 0);
 
     if (!WIFSTOPPED(status)) {
-      std::cerr << "Error: Child process not stopped" << std::endl;
+      std::cerr << "Error: Child process not stopped after PTRACE_TRACEME" << std::endl;
       return;
     }
 
+    // The process is stopped after exec due to PTRACE_TRACEME
     // Get the actual load address (for PIE binaries)
     uint64_t load_addr = get_load_address(pid, exec_path);
     uint64_t runtime_addr = load_addr + address;

test_access.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+volatile int global_counter = 0;
+
+int main() {
+    int temp;
+
+    temp = global_counter;
+    printf("Initial value: %d\n", temp);
+
+    global_counter = 42;
+    temp = global_counter;
+    printf("After write: %d\n", temp);
+
+    global_counter = global_counter + 10;
+    temp = global_counter;
+    printf("After increment: %d\n", temp);
+
+    return 0;
+}