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;
  17
  18static inline void check_config_posix_timers(void)
  19{
  20        if (timer_create(-1, 0, 0) == -1 && errno == ENOSYS)
  21                config_posix_timers = false;
  22}
  23
  24static inline bool check_skip(int clockid)
  25{
  26        if (config_posix_timers)
  27                return false;
  28
  29        switch (clockid) {
  30        /* Only these clocks are supported without CONFIG_POSIX_TIMERS. */
  31        case CLOCK_BOOTTIME:
  32        case CLOCK_MONOTONIC:
  33        case CLOCK_REALTIME:
  34                return false;
  35        default:
  36                ksft_test_result_skip("Posix Clocks & timers are not supported\n");
  37                return true;
  38        }
  39
  40        return false;
  41}
  42
  43static inline int unshare_timens(void)
  44{
  45        if (unshare(CLONE_NEWTIME)) {
  46                if (errno == EPERM)
  47                        ksft_exit_skip("need to run as root\n");
  48                return pr_perror("Can't unshare() timens");
  49        }
  50        return 0;
  51}
  52
  53static inline int _settime(clockid_t clk_id, time_t offset)
  54{
  55        int fd, len;
  56        char buf[4096];
  57
  58        if (clk_id == CLOCK_MONOTONIC_COARSE || clk_id == CLOCK_MONOTONIC_RAW)
  59                clk_id = CLOCK_MONOTONIC;
  60
  61        len = snprintf(buf, sizeof(buf), "%d %ld 0", clk_id, offset);
  62
  63        fd = open("/proc/self/timens_offsets", O_WRONLY);
  64        if (fd < 0)
  65                return pr_perror("/proc/self/timens_offsets");
  66
  67        if (write(fd, buf, len) != len)
  68                return pr_perror("/proc/self/timens_offsets");
  69
  70        close(fd);
  71
  72        return 0;
  73}
  74
  75static inline int _gettime(clockid_t clk_id, struct timespec *res, bool raw_syscall)
  76{
  77        int err;
  78
  79        if (!raw_syscall) {
  80                if (clock_gettime(clk_id, res)) {
  81                        pr_perror("clock_gettime(%d)", (int)clk_id);
  82                        return -1;
  83                }
  84                return 0;
  85        }
  86
  87        err = syscall(SYS_clock_gettime, clk_id, res);
  88        if (err)
  89                pr_perror("syscall(SYS_clock_gettime(%d))", (int)clk_id);
  90
  91        return err;
  92}
  93
  94static inline void nscheck(void)
  95{
  96        if (access("/proc/self/ns/time", F_OK) < 0)
  97                ksft_exit_skip("Time namespaces are not supported\n");
  98}
  99
 100#endif
 101