1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __TIMENS_H__
3#define __TIMENS_H__
4
5#include <fcntl.h>
6#include <unistd.h>
7#include <stdlib.h>
8#include <stdbool.h>
9
10#include "../kselftest.h"
11
12#ifndef CLONE_NEWTIME
13# define CLONE_NEWTIME	0x00000080
14#endif
15
16static int config_posix_timers = true;
17static int config_alarm_timers = true;
18
19static inline void check_supported_timers(void)
20{
21	struct timespec ts;
22
23	if (timer_create(-1, 0, 0) == -1 && errno == ENOSYS)
24		config_posix_timers = false;
25
26	if (clock_gettime(CLOCK_BOOTTIME_ALARM, &ts) == -1 && errno == EINVAL)
27		config_alarm_timers = false;
28}
29
30static inline bool check_skip(int clockid)
31{
32	if (!config_alarm_timers && clockid == CLOCK_BOOTTIME_ALARM) {
33		ksft_test_result_skip("CLOCK_BOOTTIME_ALARM isn't supported\n");
34		return true;
35	}
36
37	if (config_posix_timers)
38		return false;
39
40	switch (clockid) {
41	/* Only these clocks are supported without CONFIG_POSIX_TIMERS. */
42	case CLOCK_BOOTTIME:
43	case CLOCK_MONOTONIC:
44	case CLOCK_REALTIME:
45		return false;
46	default:
47		ksft_test_result_skip("Posix Clocks & timers are not supported\n");
48		return true;
49	}
50
51	return false;
52}
53
54static inline int unshare_timens(void)
55{
56	if (unshare(CLONE_NEWTIME)) {
57		if (errno == EPERM)
58			ksft_exit_skip("need to run as root\n");
59		return pr_perror("Can't unshare() timens");
60	}
61	return 0;
62}
63
64static inline int _settime(clockid_t clk_id, time_t offset)
65{
66	int fd, len;
67	char buf[4096];
68
69	if (clk_id == CLOCK_MONOTONIC_COARSE || clk_id == CLOCK_MONOTONIC_RAW)
70		clk_id = CLOCK_MONOTONIC;
71
72	len = snprintf(buf, sizeof(buf), "%d %ld 0", clk_id, offset);
73
74	fd = open("/proc/self/timens_offsets", O_WRONLY);
75	if (fd < 0)
76		return pr_perror("/proc/self/timens_offsets");
77
78	if (write(fd, buf, len) != len)
79		return pr_perror("/proc/self/timens_offsets");
80
81	close(fd);
82
83	return 0;
84}
85
86static inline int _gettime(clockid_t clk_id, struct timespec *res, bool raw_syscall)
87{
88	int err;
89
90	if (!raw_syscall) {
91		if (clock_gettime(clk_id, res)) {
92			pr_perror("clock_gettime(%d)", (int)clk_id);
93			return -1;
94		}
95		return 0;
96	}
97
98	err = syscall(SYS_clock_gettime, clk_id, res);
99	if (err)
100		pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id);
101
102	return err;
103}
104
105static inline void nscheck(void)
106{
107	if (access("/proc/self/ns/time", F_OK) < 0)
108		ksft_exit_skip("Time namespaces are not supported\n");
109}
110
111#endif
112