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