1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2020 Cyril Hrubis <chrubis@suse.cz>
4 */
5
6/*\
7 * [Description]
8 *
9 * Test that clock_nanosleep() adds correctly an offset with absolute timeout
10 * and CLOCK_MONOTONIC inside of a timer namespace.
11 *
12 * After a call to unshare(CLONE_NEWTIME) a new timer namespace is created, the
13 * process that has called the unshare() can adjust offsets for CLOCK_MONOTONIC
14 * and CLOCK_BOOTTIME for its children by writing to the '/proc/self/timens_offsets'.
15 */
16
17#include <stdlib.h>
18#include "time64_variants.h"
19#include "tst_safe_clocks.h"
20#include "tst_timer.h"
21#include "lapi/sched.h"
22
23#define OFFSET_S 10
24#define SLEEP_US 100000
25
26static struct time64_variants variants[] = {
27	{ .clock_gettime = libc_clock_gettime, .clock_nanosleep = libc_clock_nanosleep, .ts_type = TST_LIBC_TIMESPEC, .desc = "vDSO or syscall with libc spec"},
28
29#if (__NR_clock_nanosleep != __LTP__NR_INVALID_SYSCALL)
30	{ .clock_gettime = sys_clock_gettime, .clock_nanosleep = sys_clock_nanosleep, .ts_type = TST_KERN_OLD_TIMESPEC, .desc = "syscall with old kernel spec"},
31#endif
32
33#if (__NR_clock_nanosleep_time64 != __LTP__NR_INVALID_SYSCALL)
34	{ .clock_gettime = sys_clock_gettime64, .clock_nanosleep = sys_clock_nanosleep64, .ts_type = TST_KERN_TIMESPEC, .desc = "syscall time64 with kernel spec"},
35#endif
36};
37
38static void do_clock_gettime(struct time64_variants *tv, struct tst_ts *ts)
39{
40	int ret;
41
42	ret = tv->clock_gettime(CLOCK_MONOTONIC, tst_ts_get(ts));
43	if (ret == -1)
44		tst_brk(TBROK | TERRNO, "clock_settime(CLOCK_MONOTONIC) failed");
45}
46
47static void verify_clock_nanosleep(void)
48{
49	struct time64_variants *tv = &variants[tst_variant];
50	struct tst_ts start, end, sleep_abs;
51
52	tst_res(TINFO, "Testing variant: %s", tv->desc);
53
54	start.type = end.type = sleep_abs.type = tv->ts_type;
55
56	SAFE_UNSHARE(CLONE_NEWTIME);
57
58	SAFE_FILE_PRINTF("/proc/self/timens_offsets", "%d %d 0", CLOCK_MONOTONIC, OFFSET_S);
59
60	do_clock_gettime(tv, &start);
61
62	sleep_abs = tst_ts_add_us(start, 1000000 * OFFSET_S + SLEEP_US);
63
64	if (!SAFE_FORK()) {
65		TEST(tv->clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, tst_ts_get(&sleep_abs), NULL));
66		/*
67		 * The return value and error number are differently set for
68		 * libc syscall as compared to kernel syscall.
69		 */
70		if ((tv->clock_nanosleep == libc_clock_nanosleep) && TST_RET) {
71			TST_ERR = TST_RET;
72			TST_RET = -1;
73		}
74
75		if (TST_RET == -1) {
76			tst_res(TFAIL | TTERRNO, "clock_nanosleep(2) failed for clock %s",
77				tst_clock_name(CLOCK_MONOTONIC));
78		}
79
80		exit(0);
81	}
82
83	SAFE_WAIT(NULL);
84
85	do_clock_gettime(tv, &end);
86
87	long long diff = tst_ts_diff_us(end, start);
88
89	if (diff > 5 * SLEEP_US) {
90		tst_res(TFAIL, "clock_nanosleep() slept too long %lli", diff);
91		return;
92	}
93
94	if (diff < SLEEP_US) {
95		tst_res(TFAIL, "clock_nanosleep() slept too short %lli", diff);
96		return;
97	}
98
99	tst_res(TPASS, "clock_nanosleep() slept correctly %lli", diff);
100}
101
102static struct tst_test test = {
103	.test_all = verify_clock_nanosleep,
104	.test_variants = ARRAY_SIZE(variants),
105	.needs_root = 1,
106	.forks_child = 1,
107	.needs_kconfigs = (const char *[]) {
108		"CONFIG_TIME_NS=y",
109		NULL
110	}
111};
112