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
  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