1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2019 Linaro Limited. All rights reserved.
4 * Author: Rafael David Tinoco <rafael.tinoco@linaro.org>
5 */
6
7 /*
8 * Basic test for clock_settime(2) on REALTIME clock:
9 *
10 * 1) advance DELTA_SEC seconds
11 * 2) go backwards DELTA_SEC seconds
12 *
13 * Restore wall clock at the end of test.
14 */
15
16 #include "config.h"
17 #include "time64_variants.h"
18 #include "tst_timer.h"
19 #include "tst_safe_clocks.h"
20
21 #define DELTA_SEC 10
22 #define DELTA_US (long long) (DELTA_SEC * 1000000)
23 #define DELTA_EPS (long long) (DELTA_US * 0.1)
24
25 static struct tst_ts *begin, *change, *end;
26
27 static struct time64_variants variants[] = {
28 { .clock_gettime = libc_clock_gettime, .clock_settime = libc_clock_settime, .ts_type = TST_LIBC_TIMESPEC, .desc = "vDSO or syscall with libc spec"},
29
30 #if (__NR_clock_settime != __LTP__NR_INVALID_SYSCALL)
31 { .clock_gettime = sys_clock_gettime, .clock_settime = sys_clock_settime, .ts_type = TST_KERN_OLD_TIMESPEC, .desc = "syscall with old kernel spec"},
32 #endif
33
34 #if (__NR_clock_settime64 != __LTP__NR_INVALID_SYSCALL)
35 { .clock_gettime = sys_clock_gettime64, .clock_settime = sys_clock_settime64, .ts_type = TST_KERN_TIMESPEC, .desc = "syscall time64 with kernel spec"},
36 #endif
37 };
38
setup(void)39 static void setup(void)
40 {
41 begin->type = change->type = end->type = variants[tst_variant].ts_type;
42 tst_res(TINFO, "Testing variant: %s", variants[tst_variant].desc);
43 }
44
do_clock_gettime(struct time64_variants * tv,struct tst_ts * ts)45 static void do_clock_gettime(struct time64_variants *tv, struct tst_ts *ts)
46 {
47 int ret;
48
49 ret = tv->clock_gettime(CLOCK_REALTIME, tst_ts_get(ts));
50 if (ret == -1)
51 tst_brk(TBROK | TERRNO, "clock_settime(CLOCK_REALTIME) failed");
52 }
53
verify_clock_settime(void)54 static void verify_clock_settime(void)
55 {
56 struct time64_variants *tv = &variants[tst_variant];
57 long long elapsed;
58
59 /* test 01: move forward */
60 do_clock_gettime(tv, begin);
61
62 *change = tst_ts_add_us(*begin, DELTA_US);
63
64 TEST(tv->clock_settime(CLOCK_REALTIME, tst_ts_get(change)));
65 if (TST_RET == -1) {
66 tst_res(TFAIL | TTERRNO, "clock_settime(2) failed for clock %s",
67 tst_clock_name(CLOCK_REALTIME));
68 return;
69 }
70
71 do_clock_gettime(tv, end);
72
73 elapsed = tst_ts_diff_us(*end, *begin);
74
75 if (elapsed >= DELTA_US && elapsed < (DELTA_US + DELTA_EPS))
76 tst_res(TPASS, "clock_settime(2): was able to advance time");
77 else
78 tst_res(TFAIL, "clock_settime(2): could not advance time");
79
80 /* test 02: move backward */
81 do_clock_gettime(tv, begin);
82
83 *change = tst_ts_sub_us(*begin, DELTA_US);
84
85 TEST(tv->clock_settime(CLOCK_REALTIME, tst_ts_get(change)));
86 if (TST_RET == -1) {
87 tst_res(TFAIL | TTERRNO, "clock_settime(2) failed for clock %s",
88 tst_clock_name(CLOCK_REALTIME));
89 return;
90 }
91
92 do_clock_gettime(tv, end);
93
94 elapsed = tst_ts_diff_us(*end, *begin);
95
96 if (~(elapsed) <= DELTA_US && ~(elapsed) > (DELTA_US - DELTA_EPS))
97 tst_res(TPASS, "clock_settime(2): was able to recede time");
98 else
99 tst_res(TFAIL, "clock_settime(2): could not recede time");
100 }
101
102 static struct tst_test test = {
103 .test_all = verify_clock_settime,
104 .test_variants = ARRAY_SIZE(variants),
105 .setup = setup,
106 .needs_root = 1,
107 .restore_wallclock = 1,
108 .bufs = (struct tst_buffers []) {
109 {&begin, .size = sizeof(*begin)},
110 {&change, .size = sizeof(*change)},
111 {&end, .size = sizeof(*end)},
112 {},
113 }
114 };
115