[PATCH v6 3/5] ftrace: Convert ftrace_regression02.sh to C

Convert ftrace_regression02.sh to C using the new LTP test API.
This test validates ftrace event tracing functionality, specifically
checking for grp and res fields in signal_generate events.

This is a regression test for commits 6c303d3 and 163566f which
added group and result fields to signal events.

Key changes:
- Uses new LTP C API (tst_test.h)
- Leverages ftrace_lib for common operations
- Proper error handling with LTP macros
- Sets .min_kver = "3.2" for kernel version requirement
- Requires root privileges (.needs_root = 1)

The test enables event tracing, generates events, and verifies
they are captured in the trace buffer with the expected fields.

Signed-off-by: Praveen K Pandey <[email protected]>
---
 .../tracing/ftrace_test/ftrace_regression02.c | 101 ++++++++++++++++++
 .../ftrace_test/ftrace_regression02.sh        |  63 -----------
 2 files changed, 101 insertions(+), 63 deletions(-)
 create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_regression02.c
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_regression02.sh

diff --git a/testcases/kernel/tracing/ftrace_test/ftrace_regression02.c b/testcases/kernel/tracing/ftrace_test/ftrace_regression02.c
new file mode 100644
index 000000000..4484ba613
--- /dev/null
+++ b/testcases/kernel/tracing/ftrace_test/ftrace_regression02.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2015 Red Hat Inc.
+ * Copyright (c) 2024 Linux Test Project
+ * Copyright (c) IBM, 2026
+ *
+ * Author: Li Wang <[email protected]>
+ * Converted to C by: Praveen K Pandey <[email protected]>
+ */
+
+/*\
+ * Verify that signal:signal_generate tracepoint exposes 'grp=' and 'res=' fields.
+ *
+ * This test verifies kernel commits that added more information to the
+ * signal_generate tracepoint:
+ *
+ * - Commit 6c303d3 (tracing: let trace_signal_generate() report more info...)
+ * - Commit 163566f (tracing: send_sigqueue() needs trace_signal_generate())
+ *
+ * These fields were added in kernel 3.2.
+ *
+ * Requires root to access and configure the ftrace subsystem via debugfs.
+ *
+ * [Algorithm]
+ *
+ * - Enable signal:signal_generate event
+ * - Enable tracing
+ * - Generate signals by running commands
+ * - Read trace output and search for 'grp=' and 'res=' fields
+ * - Test passes if both fields are found in the trace
+ */
+
+#include "tst_test.h"
+#include "ftrace_lib.h"
+
+#define SIGNAL_LOOP 100
+
+static void run_test(void)
+{
+	int i;
+	char *trace_content;
+	int found = 0;
+
+	/* Set event */
+	if (ftrace_write_file("set_event", "signal:signal_generate\n") != 0)
+		tst_brk(TBROK, "Failed to set signal:signal_generate event");
+
+	/* Enable tracing */
+	ftrace_enable_tracing();
+
+	/* Clear trace buffer */
+	ftrace_clear_trace();
+
+	/* Generate some signals by running commands */
+	for (i = 0; i < SIGNAL_LOOP; i++) {
+		/* Run a simple command that will generate signals */
+		if (system("ls -l /proc > /dev/null 2>&1") == -1)
+			tst_res(TINFO, "Command execution failed, continuing...");
+	}
+
+	/* Wait for trace to be written and contain signal events */
+	trace_content = TST_RETRY_FUNC(ftrace_read_file("trace"), TST_RETVAL_NOTNULL);
+	if (!trace_content)
+		tst_brk(TBROK, "Failed to read trace file");
+
+	/* Check for 'grp=' and 'res=' fields in trace */
+	if (strstr(trace_content, "grp=") && strstr(trace_content, "res="))
+		found = 1;
+
+	free(trace_content);
+
+	if (found)
+		tst_res(TPASS, "signal_generate event contains grp and res fields");
+	else
+		tst_res(TFAIL, "signal_generate event missing grp or res fields");
+}
+
+static void setup(void)
+{
+	ftrace_initialize();
+}
+
+static void cleanup(void)
+{
+	ftrace_cleanup();
+}
+
+static struct tst_test test = {
+	.test_all = run_test,
+	.setup = setup,
+	.cleanup = cleanup,
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+	.min_kver = "3.2",
+	.tags = (const struct tst_tag[]) {
+		{"linux-git", "6c303d3"},
+		{"linux-git", "163566f"},
+		{}
+	}
+};
+
diff --git a/testcases/kernel/tracing/ftrace_test/ftrace_regression02.sh b/testcases/kernel/tracing/ftrace_test/ftrace_regression02.sh
deleted file mode 100755
index 3c32f219e..000000000
--- a/testcases/kernel/tracing/ftrace_test/ftrace_regression02.sh
+++ /dev/null
@@ -1,63 +0,0 @@
-#! /bin/sh
-
-###########################################################################
-##                                                                       ##
-## Copyright (c) 2015, Red Hat Inc.                                      ##
-##                                                                       ##
-## This program is free software: you can redistribute it and/or modify  ##
-## it under the terms of the GNU General Public License as published by  ##
-## the Free Software Foundation, either version 3 of the License, or     ##
-## (at your option) any later version.                                   ##
-##                                                                       ##
-## This program is distributed in the hope that it will be useful,       ##
-## but WITHOUT ANY WARRANTY; without even the implied warranty of        ##
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          ##
-## GNU General Public License for more details.                          ##
-##                                                                       ##
-## You should have received a copy of the GNU General Public License     ##
-## along with this program. If not, see <http://www.gnu.org/licenses/>.  ##
-##                                                                       ##
-## Author: Li Wang <[email protected]>                                   ##
-##                                                                       ##
-###########################################################################
-##                                                                       ##
-## Summary: check signal:signal_generate gives 2 more fields: grp res    ##
-##                                                                       ##
-## This testcase is writing for signal events change:                    ##
-##       6c303d3 tracing: let trace_signal_generate() report more info...##
-##       163566f tracing: send_sigqueue() needs trace_signal_generate()  ##
-##                                                                       ##
-###########################################################################
-
-export TCID="ftrace_regression02"
-export TST_TOTAL=1
-
-. ftrace_lib.sh
-
-ftrace_signal_test()
-{
-	# Set envent
-	echo 'signal:signal_generate' > $TRACING_PATH/set_event
-	echo 1 > $TRACING_PATH/tracing_on
-	echo > $TRACING_PATH/trace
-
-	# just to generate trace
-	for i in $(seq 100); do
-		ls -l /proc > /dev/null 2>&1
-	done
-
-	grep -q 'grp=[0-9] res=[0-9]' $TRACING_PATH/trace
-	if [ $? -eq 0 ]; then
-		tst_resm TPASS "finished running the test."
-	else
-		tst_resm TFAIL "running the test failed, please check log message."
-	fi
-}
-
-if tst_kvcmp -lt "3.2"; then
-	tst_brkm TCONF "The test should be run in kernels >= 3.2.0 Skip the test..."
-fi
-
-ftrace_signal_test
-
-tst_exit
-- 
2.50.1

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