diff --git a/util.c b/util.c
new file mode 100644
index 0000000..11f6090
--- /dev/null
+++ b/util.c
@@ -0,0 +1,23 @@
+
+
+#include <err.h>
+#include <unistd.h>
+
+#include "console-server.h"
+
+int write_buf_to_fd(int fd, const uint8_t *buf, size_t len)
+{
+	size_t pos;
+	ssize_t rc;
+
+	for (pos = 0; pos < len; pos += rc) {
+		rc = write(fd, buf + pos, len - pos);
+		if (rc <= 0) {
+			warn("Write error");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+