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 
16 static int config_posix_timers = true;
17 static int config_alarm_timers = true;
18 
19 static 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 
30 static 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 
54 static 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 
64 static 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 
86 static 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 
105 static 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