LXR linux/tools/testing/selftests/timens/timens.h

   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