diff --git a/bba/main.cc b/bba/main.cc
new file mode 100644
index 00000000..42b79504
--- /dev/null
+++ b/bba/main.cc
@@ -0,0 +1,15 @@
+#include <unistd.h>
+#include <assert.h>
+int main()
+{
+    char buffer[512];
+    int i, j;
+    while (1) {
+        i = read(0, buffer, 512);
+        if (i == 0) break;
+        assert(i > 0);
+        j = write(1, buffer, i);
+        assert(i == j);
+    }
+    return 0;
+}