tools/testing/selftests/timens/timerfd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #define _GNU_SOURCE
   3 #include <sched.h>
   4
   5 #include <sys/timerfd.h>
   6 #include <sys/syscall.h>
   7 #include <sys/types.h>
   8 #include <sys/wait.h>
   9 #include <time.h>
  10 #include <unistd.h>
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <stdint.h>
  14
  15 #include "log.h"
  16 #include "timens.h"
  17
  18 static int tclock_gettime(clock_t clockid, struct timespec *now)
  19 {
  20         if (clockid == CLOCK_BOOTTIME_ALARM)
  21                 clockid = CLOCK_BOOTTIME;
  22         return clock_gettime(clockid, now);
  23 }
  24
  25 int run_test(int clockid, struct timespec now)
  26 {
  27         struct itimerspec new_value;
  28         long long elapsed;
  29         int fd, i;
  30
  31         if (check_skip(clockid))
  32                 return 0;
  33
  34         if (tclock_gettime(clockid, &now))
  35                 return pr_perror("clock_gettime(%d)", clockid);
  36
  37         for (i = 0; i < 2; i++) {
  38                 int flags = 0;
  39
  40                 new_value.it_value.tv_sec = 3600;
  41                 new_value.it_value.tv_nsec = 0;
  42                 new_value.it_interval.tv_sec = 1;
  43                 new_value.it_interval.tv_nsec = 0;
  44
  45                 if (i == 1) {
  46                         new_value.it_value.tv_sec += now.tv_sec;
  47                         new_value.it_value.tv_nsec += now.tv_nsec;
  48                 }
  49
  50                 fd = timerfd_create(clockid, 0);
  51                 if (fd == -1)
  52                         return pr_perror("timerfd_create(%d)", clockid);
  53
  54                 if (i == 1)
  55                         flags |= TFD_TIMER_ABSTIME;
  56
  57                 if (timerfd_settime(fd, flags, &new_value, NULL))
  58                         return pr_perror("timerfd_settime(%d)", clockid);
  59
  60                 if (timerfd_gettime(fd, &new_value))
  61                         return pr_perror("timerfd_gettime(%d)", clockid);
  62
  63                 elapsed = new_value.it_value.tv_sec;
  64                 if (llabs(elapsed - 3600) > 60) {
  65                         ksft_test_result_fail("clockid: %d elapsed: %lld\n",
  66                                               clockid, elapsed);
  67                         return 1;
  68                 }
  69
  70                 close(fd);
  71         }
  72
  73         ksft_test_result_pass("clockid=%d\n", clockid);
  74
  75         return 0;
  76 }
  77
  78 int main(int argc, char *argv[])
  79 {
  80         int ret, status, len, fd;
  81         char buf[4096];
  82         pid_t pid;
  83         struct timespec btime_now, mtime_now;
  84
  85         nscheck();
  86
  87         check_supported_timers();
  88
  89         ksft_set_plan(3);
  90
  91         clock_gettime(CLOCK_MONOTONIC, &mtime_now);
  92         clock_gettime(CLOCK_BOOTTIME, &btime_now);
  93
  94         if (unshare_timens())
  95                 return 1;
  96
  97         len = snprintf(buf, sizeof(buf), "%d %d 0\n%d %d 0",
  98                         CLOCK_MONOTONIC, 70 * 24 * 3600,
  99                         CLOCK_BOOTTIME, 9 * 24 * 3600);
 100         fd = open("/proc/self/timens_offsets", O_WRONLY);
 101         if (fd < 0)
 102                 return pr_perror("/proc/self/timens_offsets");
 103
 104         if (write(fd, buf, len) != len)
 105                 return pr_perror("/proc/self/timens_offsets");
 106
 107         close(fd);
 108         mtime_now.tv_sec += 70 * 24 * 3600;
 109         btime_now.tv_sec += 9 * 24 * 3600;
 110
 111         pid = fork();
 112         if (pid < 0)
 113                 return pr_perror("Unable to fork");
 114         if (pid == 0) {
 115                 ret = 0;
 116                 ret |= run_test(CLOCK_BOOTTIME, btime_now);
 117                 ret |= run_test(CLOCK_MONOTONIC, mtime_now);
 118                 ret |= run_test(CLOCK_BOOTTIME_ALARM, btime_now);
 119
 120                 if (ret)
 121                         ksft_exit_fail();
 122                 ksft_exit_pass();
 123                 return ret;
 124         }
 125
 126         if (waitpid(pid, &status, 0) != pid)
 127                 return pr_perror("Unable to wait the child process");
 128
 129         if (WIFEXITED(status))
 130                 return WEXITSTATUS(status);
 131
 132         return 1;
 133 }