diff --git a/subprojects/dhcp-done/file-io.cpp b/subprojects/dhcp-done/file-io.cpp
new file mode 100644
index 0000000..321cc6d
--- /dev/null
+++ b/subprojects/dhcp-done/file-io.cpp
@@ -0,0 +1,39 @@
+#include "file-io.hpp"
+
+#include <fcntl.h>
+#include <sys/file.h>
+#include <unistd.h>
+
+#include <stdplus/fd/atomic.hpp>
+#include <stdplus/fd/create.hpp>
+#include <stdplus/fd/fmt.hpp>
+#include <stdplus/fd/managed.hpp>
+#include <stdplus/fd/ops.hpp>
+#include <stdplus/print.hpp>
+
+#include <cerrno>
+#include <fstream>
+#include <iostream>
+#include <string>
+
+using ::stdplus::fd::ManagedFd;
+using std::literals::string_view_literals::operator""sv;
+
+// Function to read contents from a file (with locking)
+std::string fileRead(const fs::path& filename)
+{
+    // Open the file in read mode
+    ManagedFd fd = stdplus::fd::open(std::string(filename).c_str(),
+                                     stdplus::fd::OpenAccess::ReadOnly);
+    return stdplus::fd::readAll<std::string>(fd);
+}
+
+// Function to write contents to a file atomically
+void fileWrite(const fs::path& filename, const std::string& data)
+{
+    stdplus::fd::AtomicWriter writer(filename, 0644);
+    stdplus::fd::FormatBuffer out(writer);
+    out.appends(data);
+    out.flush();
+    writer.commit();
+}