[LTP] [PATCH v1] sched_setscheduler: test SCHED_RESET_ON_FORK

[Federico Bonfiglio]

---
 runtest/syscalls                              |  1 +
 .../syscalls/sched_setscheduler/.gitignore    |  1 +
 .../sched_setscheduler/sched_setscheduler04.c | 71 +++++++++++++++++++
 3 files changed, 73 insertions(+)
 create mode 100644 testcases/kernel/syscalls/sched_setscheduler/sched_setscheduler04.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 3dc6fa397..ff516af3d 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1204,6 +1204,7 @@ sched_getscheduler02 sched_getscheduler02
 sched_setscheduler01 sched_setscheduler01
 sched_setscheduler02 sched_setscheduler02
 sched_setscheduler03 sched_setscheduler03
+sched_setscheduler04 sched_setscheduler04

 sched_yield01 sched_yield01

diff --git a/testcases/kernel/syscalls/sched_setscheduler/.gitignore b/testcases/kernel/syscalls/sched_setscheduler/.gitignore
index aa8ad9695..1b8860d2c 100644
--- a/testcases/kernel/syscalls/sched_setscheduler/.gitignore
+++ b/testcases/kernel/syscalls/sched_setschedule
r/.gitignore
@@ -1,3 +1,4 @@
 /sched_setscheduler01
 /sched_setscheduler02
 /sched_setscheduler03
+/sched_setscheduler04
diff --git a/testcases/kernel/syscalls/sched_setscheduler/sched_setscheduler04.c b/testcases/kernel/syscalls/sched_setscheduler/sched_setscheduler04.c
new file mode 100644
index 000000000..f2643f001
--- /dev/null
+++ b/testcases/kernel/syscalls/sched_setscheduler/sched_setscheduler04.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2022 Federico Bonfiglio <federico.bonfiglio@protonmail.ch>
+ */
+
+/*
+ * [Description]
+ *
+ * Testcases that test if sched_setscheduler with flag
+ * SCHED_RESET_ON_FORK restores children policy to
+ * SCHED_NORMAL.
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <sched.h>
+#include <linux/sched.h>
+
+#include "tst_test.h"
+#include "tst_sched.h"
+
+struct test_case_t {
+	int policy;
+	char *desc;
+};
+
+static struct test_cas
e_t cases[] = {
+	{
+		.policy = SCHED_FIFO,
+		.desc = "SCHED_FIFO"
+	},
+	{
+		.policy = SCHED_RR,
+		.desc = "SCHED_RR"
+	}
+};
+
+static void test_reset_on_fork(unsigned int i)
+{
+	struct sched_variant *tv = &sched_variants[tst_variant];
+	struct test_case_t *tc = &cases[i];
+
+	tst_res(TINFO, "Testing %s variant", tv->desc);
+	tst_res(TINFO, "Testing %s policy", tc->desc);
+
+	struct sched_param param = { .sched_priority = 1 };
+
+	tv->sched_setscheduler(getpid(), tc->policy | SCHED_RESET_ON_FORK, &param);
+
+	pid_t pid = SAFE_FORK();
+
+	if (!pid == 0) {
+		if (sched_getscheduler(pid) == SCHED_NORMAL)
+			tst_res(TPASS, "Policy reset to SCHED_NORMAL");
+		else
+			tst_res(TFAIL, "Policy NOT reset to SCHED_NORMAL");
+	}
+
+	tst_reap_children();
+}
+
+static struct tst_test test = {
+	.forks_child = 1,
+	.needs_root = 1,
+	.test_variants = ARRAY_SIZE(sched_variants),
+	.tcnt = ARRAY_SIZE(cases),
+	.test = test_reset_on_fork
+};
+
--
2.3
8.0

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