[RFC PATCH 1/4 v2] ftracetest: Add clear_trace() helper to reset the trace file

[Steven Rostedt <rostedt@goodmis.org>]

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From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

Created the file tools/testing/ftrace/test.d/functions that will
hold helper functions.

First function added was clear_trace() that is descriptive in its
name to show that "echo > trace" is clearing the trace file.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/testing/selftests/ftrace/ftracetest       | 3 +++
 tools/testing/selftests/ftrace/test.d/functions | 4 ++++
 2 files changed, 7 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/functions

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index f15c0da07aca..c6381a9faf83 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -235,6 +235,9 @@ run_test() { # testfile
   fi
 }
 
+# load in the helper functions
+. $TEST_DIR/functions
+
 # Main loop
 for t in $TEST_CASES; do
   run_test $t
diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
new file mode 100644
index 000000000000..1aa9f2e9c40b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/functions
@@ -0,0 +1,4 @@
+
+clear_trace() { # reset trace output
+    echo > trace
+}
-- 
2.1.1