xref: /aosp_15_r20/external/ltp/testcases/kernel/syscalls/munlockall/munlockall01.c (revision 49cdfc7efb34551c7342be41a7384b9c40d7cab7)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright Red Hat
 * Author: Dennis Brendel <[email protected]>
 */

/*\
 * [Description]
 *
 * Verify that munlockall(2) unlocks all previously locked memory.
 */

#include <sys/mman.h>

#include "tst_test.h"

static void verify_munlockall(void)
{
	unsigned long size = 0;

	SAFE_FILE_LINES_SCANF("/proc/self/status", "VmLck: %ld", &size);

	if (size != 0UL)
		tst_brk(TBROK, "Locked memory after init should be 0 but is %ld", size);

	if (mlockall(MCL_CURRENT | MCL_FUTURE) != 0)
		tst_brk(TBROK | TERRNO, "Could not lock memory using mlockall()");

	SAFE_FILE_LINES_SCANF("/proc/self/status", "VmLck: %ld", &size);

	if (size == 0UL)
		tst_brk(TBROK, "Locked memory after mlockall() should be > 0");

	TST_EXP_PASS(munlockall(), "Unlock memory using munlockall()");

	SAFE_FILE_LINES_SCANF("/proc/self/status", "VmLck: %ld", &size);

	if (size != 0UL)
		tst_res(TFAIL, "Locked memory after munlockall() should be 0 but is %ld", size);
	else
		tst_res(TPASS, "Memory successfully locked and unlocked");
}

static struct tst_test test = {
	.test_all = verify_munlockall,
};