1/*
2 * Copyright (c) 2017 Cyril Hrubis <chrubis@suse.cz>
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <unistd.h>
19#include <stdint.h>
20#include <inttypes.h>
21#include <errno.h>
22
23#include "tst_test.h"
24
25void verify_brk(void)
26{
27	uintptr_t cur_brk, new_brk;
28	uintptr_t inc = getpagesize() * 2 - 1;
29	unsigned int i;
30
31	cur_brk = (uintptr_t)sbrk(0);
32
33	for (i = 0; i < 33; i++) {
34		switch (i % 3) {
35		case 0:
36			new_brk = cur_brk + inc;
37		break;
38		case 1:
39			new_brk = cur_brk;
40		break;
41		case 2:
42			new_brk = cur_brk - inc;
43		break;
44		}
45
46		TEST(brk((void *)new_brk));
47
48		if (TEST_RETURN == -1) {
49			tst_res(TFAIL | TERRNO, "brk() failed");
50			return;
51		}
52
53		cur_brk = (uintptr_t)sbrk(0);
54
55		if (cur_brk != new_brk) {
56			tst_res(TFAIL,
57				"brk() failed to set address have %p expected %p",
58				(void *)cur_brk, (void *)new_brk);
59			return;
60		}
61
62		/* Try to write to the newly allocated heap */
63		if (i % 3 == 0)
64			*((char *)cur_brk) = 0;
65	}
66
67	tst_res(TPASS, "brk() works fine");
68}
69
70static struct tst_test test = {
71	.test_all = verify_brk,
72};
73