1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __TIMENS_H__
3*4882a593Smuzhiyun #define __TIMENS_H__
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <fcntl.h>
6*4882a593Smuzhiyun #include <unistd.h>
7*4882a593Smuzhiyun #include <stdlib.h>
8*4882a593Smuzhiyun #include <stdbool.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include "../kselftest.h"
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #ifndef CLONE_NEWTIME
13*4882a593Smuzhiyun # define CLONE_NEWTIME 0x00000080
14*4882a593Smuzhiyun #endif
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun static int config_posix_timers = true;
17*4882a593Smuzhiyun static int config_alarm_timers = true;
18*4882a593Smuzhiyun
check_supported_timers(void)19*4882a593Smuzhiyun static inline void check_supported_timers(void)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct timespec ts;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun if (timer_create(-1, 0, 0) == -1 && errno == ENOSYS)
24*4882a593Smuzhiyun config_posix_timers = false;
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun if (clock_gettime(CLOCK_BOOTTIME_ALARM, &ts) == -1 && errno == EINVAL)
27*4882a593Smuzhiyun config_alarm_timers = false;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
check_skip(int clockid)30*4882a593Smuzhiyun static inline bool check_skip(int clockid)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun if (!config_alarm_timers && clockid == CLOCK_BOOTTIME_ALARM) {
33*4882a593Smuzhiyun ksft_test_result_skip("CLOCK_BOOTTIME_ALARM isn't supported\n");
34*4882a593Smuzhiyun return true;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun if (config_posix_timers)
38*4882a593Smuzhiyun return false;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun switch (clockid) {
41*4882a593Smuzhiyun /* Only these clocks are supported without CONFIG_POSIX_TIMERS. */
42*4882a593Smuzhiyun case CLOCK_BOOTTIME:
43*4882a593Smuzhiyun case CLOCK_MONOTONIC:
44*4882a593Smuzhiyun case CLOCK_REALTIME:
45*4882a593Smuzhiyun return false;
46*4882a593Smuzhiyun default:
47*4882a593Smuzhiyun ksft_test_result_skip("Posix Clocks & timers are not supported\n");
48*4882a593Smuzhiyun return true;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun return false;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
unshare_timens(void)54*4882a593Smuzhiyun static inline int unshare_timens(void)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun if (unshare(CLONE_NEWTIME)) {
57*4882a593Smuzhiyun if (errno == EPERM)
58*4882a593Smuzhiyun ksft_exit_skip("need to run as root\n");
59*4882a593Smuzhiyun return pr_perror("Can't unshare() timens");
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun return 0;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
_settime(clockid_t clk_id,time_t offset)64*4882a593Smuzhiyun static inline int _settime(clockid_t clk_id, time_t offset)
65*4882a593Smuzhiyun {
66*4882a593Smuzhiyun int fd, len;
67*4882a593Smuzhiyun char buf[4096];
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun if (clk_id == CLOCK_MONOTONIC_COARSE || clk_id == CLOCK_MONOTONIC_RAW)
70*4882a593Smuzhiyun clk_id = CLOCK_MONOTONIC;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun len = snprintf(buf, sizeof(buf), "%d %ld 0", clk_id, offset);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun fd = open("/proc/self/timens_offsets", O_WRONLY);
75*4882a593Smuzhiyun if (fd < 0)
76*4882a593Smuzhiyun return pr_perror("/proc/self/timens_offsets");
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun if (write(fd, buf, len) != len)
79*4882a593Smuzhiyun return pr_perror("/proc/self/timens_offsets");
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun close(fd);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun return 0;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
_gettime(clockid_t clk_id,struct timespec * res,bool raw_syscall)86*4882a593Smuzhiyun static inline int _gettime(clockid_t clk_id, struct timespec *res, bool raw_syscall)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun int err;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun if (!raw_syscall) {
91*4882a593Smuzhiyun if (clock_gettime(clk_id, res)) {
92*4882a593Smuzhiyun pr_perror("clock_gettime(%d)", (int)clk_id);
93*4882a593Smuzhiyun return -1;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun return 0;
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun err = syscall(SYS_clock_gettime, clk_id, res);
99*4882a593Smuzhiyun if (err)
100*4882a593Smuzhiyun pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id);
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun return err;
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun
nscheck(void)105*4882a593Smuzhiyun static inline void nscheck(void)
106*4882a593Smuzhiyun {
107*4882a593Smuzhiyun if (access("/proc/self/ns/time", F_OK) < 0)
108*4882a593Smuzhiyun ksft_exit_skip("Time namespaces are not supported\n");
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun #endif
112