Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#define _GNU_SOURCE
3#include <sched.h>
4
5#include <sys/timerfd.h>
6#include <sys/syscall.h>
7#include <sys/types.h>
8#include <sys/wait.h>
9#include <time.h>
10#include <unistd.h>
11#include <stdlib.h>
12#include <stdio.h>
13#include <stdint.h>
14
15#include "log.h"
16#include "timens.h"
17
18static int tclock_gettime(clock_t clockid, struct timespec *now)
19{
20 if (clockid == CLOCK_BOOTTIME_ALARM)
21 clockid = CLOCK_BOOTTIME;
22 return clock_gettime(clockid, now);
23}
24
25int run_test(int clockid, struct timespec now)
26{
27 struct itimerspec new_value;
28 long long elapsed;
29 int fd, i;
30
31 if (tclock_gettime(clockid, &now))
32 return pr_perror("clock_gettime(%d)", clockid);
33
34 for (i = 0; i < 2; i++) {
35 int flags = 0;
36
37 new_value.it_value.tv_sec = 3600;
38 new_value.it_value.tv_nsec = 0;
39 new_value.it_interval.tv_sec = 1;
40 new_value.it_interval.tv_nsec = 0;
41
42 if (i == 1) {
43 new_value.it_value.tv_sec += now.tv_sec;
44 new_value.it_value.tv_nsec += now.tv_nsec;
45 }
46
47 fd = timerfd_create(clockid, 0);
48 if (fd == -1)
49 return pr_perror("timerfd_create(%d)", clockid);
50
51 if (i == 1)
52 flags |= TFD_TIMER_ABSTIME;
53
54 if (timerfd_settime(fd, flags, &new_value, NULL))
55 return pr_perror("timerfd_settime(%d)", clockid);
56
57 if (timerfd_gettime(fd, &new_value))
58 return pr_perror("timerfd_gettime(%d)", clockid);
59
60 elapsed = new_value.it_value.tv_sec;
61 if (abs(elapsed - 3600) > 60) {
62 ksft_test_result_fail("clockid: %d elapsed: %lld\n",
63 clockid, elapsed);
64 return 1;
65 }
66
67 close(fd);
68 }
69
70 ksft_test_result_pass("clockid=%d\n", clockid);
71
72 return 0;
73}
74
75int main(int argc, char *argv[])
76{
77 int ret, status, len, fd;
78 char buf[4096];
79 pid_t pid;
80 struct timespec btime_now, mtime_now;
81
82 nscheck();
83
84 ksft_set_plan(3);
85
86 clock_gettime(CLOCK_MONOTONIC, &mtime_now);
87 clock_gettime(CLOCK_BOOTTIME, &btime_now);
88
89 if (unshare_timens())
90 return 1;
91
92 len = snprintf(buf, sizeof(buf), "%d %d 0\n%d %d 0",
93 CLOCK_MONOTONIC, 70 * 24 * 3600,
94 CLOCK_BOOTTIME, 9 * 24 * 3600);
95 fd = open("/proc/self/timens_offsets", O_WRONLY);
96 if (fd < 0)
97 return pr_perror("/proc/self/timens_offsets");
98
99 if (write(fd, buf, len) != len)
100 return pr_perror("/proc/self/timens_offsets");
101
102 close(fd);
103 mtime_now.tv_sec += 70 * 24 * 3600;
104 btime_now.tv_sec += 9 * 24 * 3600;
105
106 pid = fork();
107 if (pid < 0)
108 return pr_perror("Unable to fork");
109 if (pid == 0) {
110 ret = 0;
111 ret |= run_test(CLOCK_BOOTTIME, btime_now);
112 ret |= run_test(CLOCK_MONOTONIC, mtime_now);
113 ret |= run_test(CLOCK_BOOTTIME_ALARM, btime_now);
114
115 if (ret)
116 ksft_exit_fail();
117 ksft_exit_pass();
118 return ret;
119 }
120
121 if (waitpid(pid, &status, 0) != pid)
122 return pr_perror("Unable to wait the child process");
123
124 if (WIFEXITED(status))
125 return WEXITSTATUS(status);
126
127 return 1;
128}