xref: /third_party/ltp/testcases/kernel/syscalls/sched_setparam/sched_setparam02.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2021, BELLSOFT. All rights reserved.
 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
 * AUTHOR: Saji Kumar.V.R <saji.kumar@wipro.com>
 */

/*\
 * [Description]
 *
 * Checks functionality for sched_setparam(2)
 *
 * This test changes the scheduling priority for current process
 * and verifies it by calling sched_getparam().
 */

#include "tst_test.h"
#include "tst_sched.h"

#define FIFO_OR_RR_PRIO 5
#define OTHER_PRIO 0

static struct test_cases_t {
	char *desc;
	int policy;
	int priority;
	int param;
} tcases[] = {
	{
	"Test with policy SCHED_FIFO", SCHED_FIFO, FIFO_OR_RR_PRIO, 1}, {
	"Test with policy SCHED_RR", SCHED_RR, FIFO_OR_RR_PRIO, 1}, {
	"Test with SCHED_OTHER", SCHED_OTHER, OTHER_PRIO, 0}
};

static void run(unsigned int n)
{
	struct test_cases_t *tc = &tcases[n];
	struct sched_variant *tv = &sched_variants[tst_variant];
	struct sched_param p = { .sched_priority = tc->param };

	TST_EXP_PASS_SILENT(tv->sched_setscheduler(0, tc->policy, &p));

	p.sched_priority = tc->priority;
	TST_EXP_PASS_SILENT(tv->sched_setparam(0, &p));

	p.sched_priority = -1;
	TST_EXP_PASS_SILENT(tv->sched_getparam(0, &p));

	if (p.sched_priority == tc->priority) {
		tst_res(TPASS, "got expected priority %d", p.sched_priority);
	} else {
		tst_res(TFAIL, "unexpected priority value %d, expected %d",
			p.sched_priority, tc->priority);
	}
}

static void setup(void)
{
	tst_res(TINFO, "Testing %s variant", sched_variants[tst_variant].desc);
}

static struct tst_test test = {
	.needs_root = 1,
	.setup = setup,
	.test = run,
	.test_variants = ARRAY_SIZE(sched_variants),
	.tcnt = ARRAY_SIZE(tcases),
};