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
26 static 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
do_clock_gettime(struct time64_variants * tv,struct tst_ts * ts)38 static 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
verify_clock_nanosleep(void)47 static 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
102 static 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