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1 files changed, 15 insertions, 0 deletions

diff --git a/examples/small_demos/keyhack.stp b/examples/small_demos/keyhack.stp
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+++ b/examples/small_demos/keyhack.stp
@@ -0,0 +1,15 @@
+#! /usr/bin/env stap
+
+# This is not useful, but it demonstrates that
+# Systemtap can modify variables in a running kernel.
+
+# Usage: ./keyhack.stp -g
+
+probe kernel.function("kbd_event") {
+	# Changes 'm' to 'b' .
+	if ($event_code == 50) $event_code = 48
+}
+
+probe end {
+	printf("\nDONE\n")
+}