1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
4 *
5 * Block on a futex and wait for wakeup.
6 *
7 * This tests uses shared memory page to store the mutex variable.
8 */
9
10#include <sys/mman.h>
11#include <sys/wait.h>
12
13#include "futextest.h"
14#include "futex_utils.h"
15
16static futex_t *futex;
17
18static struct futex_test_variants variants[] = {
19#if (__NR_futex != __LTP__NR_INVALID_SYSCALL)
20	{ .fntype = FUTEX_FN_FUTEX, .desc = "syscall with old kernel spec"},
21#endif
22
23#if (__NR_futex_time64 != __LTP__NR_INVALID_SYSCALL)
24	{ .fntype = FUTEX_FN_FUTEX64, .desc = "syscall time64 with kernel spec"},
25#endif
26};
27
28static void do_child(void)
29{
30	struct futex_test_variants *tv = &variants[tst_variant];
31	int ret;
32
33	TST_PROCESS_STATE_WAIT(getppid(), 'S', 1000);
34
35	ret = futex_wake(tv->fntype, futex, 1, 0);
36
37	if (ret != 1)
38		tst_res(TFAIL | TERRNO, "futex_wake() failed");
39
40	exit(0);
41}
42
43static void run(void)
44{
45	struct futex_test_variants *tv = &variants[tst_variant];
46	int res, pid;
47
48	pid = SAFE_FORK();
49	if (!pid)
50		do_child();
51
52	res = futex_wait(tv->fntype, futex, *futex, NULL, 0);
53	if (res) {
54		tst_res(TFAIL | TERRNO, "futex_wait() failed");
55		return;
56	}
57
58	SAFE_WAIT(NULL);
59	tst_res(TPASS, "futex_wait() woken up");
60}
61
62static void setup(void)
63{
64	struct futex_test_variants *tv = &variants[tst_variant];
65
66	tst_res(TINFO, "Testing variant: %s", tv->desc);
67	futex_supported_by_kernel(tv->fntype);
68
69	futex = SAFE_MMAP(NULL, sizeof(*futex), PROT_READ | PROT_WRITE,
70			  MAP_ANONYMOUS | MAP_SHARED, -1, 0);
71
72	*futex = FUTEX_INITIALIZER;
73}
74
75static struct tst_test test = {
76	.setup = setup,
77	.test_all = run,
78	.test_variants = ARRAY_SIZE(variants),
79	.forks_child = 1,
80};
81