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