[PATCH v3 3/9] test: add systemwide stapsdt note test

[Alan Maguire <alan.maguire@oracle.com>]

Add test verifying that systemwide stapsdt probe firing
is detected and we retrieve arguments correctly.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 .../usdt/tst.stapsdt-notes-systemwide.r       |  2 +
 .../usdt/tst.stapsdt-notes-systemwide.sh      | 51 +++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 test/unittest/usdt/tst.stapsdt-notes-systemwide.r
 create mode 100755 test/unittest/usdt/tst.stapsdt-notes-systemwide.sh

diff --git a/test/unittest/usdt/tst.stapsdt-notes-systemwide.r b/test/unittest/usdt/tst.stapsdt-notes-systemwide.r
new file mode 100644
index 00000000..48ee5472
--- /dev/null
+++ b/test/unittest/usdt/tst.stapsdt-notes-systemwide.r
@@ -0,0 +1,2 @@
+test:args:2:./test:val:18
+
diff --git a/test/unittest/usdt/tst.stapsdt-notes-systemwide.sh b/test/unittest/usdt/tst.stapsdt-notes-systemwide.sh
new file mode 100755
index 00000000..d4de6d2b
--- /dev/null
+++ b/test/unittest/usdt/tst.stapsdt-notes-systemwide.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+#
+# Oracle Linux DTrace.
+# Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
+# Licensed under the Universal Permissive License v 1.0 as shown at
+# http://oss.oracle.com/licenses/upl.
+
+# This test covers stapsdt probes fired by the STAP_PROBEn macros,
+# testing various argument forms (constant, register, deref etc).
+
+if [ $# != 1 ]; then
+	echo expected one argument: '<'dtrace-path'>'
+	exit 2
+fi
+
+dtrace=$1
+CC=/usr/bin/gcc
+CFLAGS="-I${PWD}/test/unittest/usdt"
+
+DIRNAME="$tmpdir/usdt-notes.$$.$RANDOM"
+mkdir -p $DIRNAME
+cd $DIRNAME
+
+cat > test.c <<EOF
+#include <sdt_notes.h>
+
+int
+main(int argc, char **argv)
+{
+	STAP_PROBE4(test_prov, args, argc, argv[0], argv[1] + 4, 18);
+}
+EOF
+
+${CC} ${CFLAGS} -o test test.c
+if [ $? -ne 0 ]; then
+	echo "failed to compile test.c" >& 2
+	exit 1
+fi
+export PATH=.:$PATH
+
+$dtrace -c './test arg1val' -qs /dev/stdin <<EOF
+test_prov*:test::args
+{
+	printf("%s:%s:%li:%s:%s:%li\n", probemod, probename,
+	       arg0, copyinstr(arg1), copyinstr(arg2), arg3);
+}
+
+EOF
+status=$?
+
+exit $status
-- 
2.43.5