selftests/timens: Add a test for timerfd

Check that timerfd_create() takes into account clock offsets.

Output on success:
 1..3
 ok 1 clockid=7
 ok 2 clockid=1
 ok 3 clockid=9
 # Pass 3 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0

Output on failure:
 1..3
 not ok 1 clockid: 7 elapsed: 0
 not ok 2 clockid: 1 elapsed: 0
 not ok 3 clockid: 9 elapsed: 0
 Bail out!

Output with lack of permissions:
 1..3
 not ok 1 # SKIP need to run as root

Output without support of time namespaces:
 1..3
 not ok 1 # SKIP Time namespaces are not supported

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-30-dima@arista.com

diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore
index 27a693229ce1aaa31553b846ec86b189dcb49f34..b609f6ee9fb908029b5c172c76806e661488fc0d 100644 (file)
--- a/tools/testing/selftests/timens/.gitignore
+++ b/tools/testing/selftests/timens/.gitignore
@@ -1 +1,2 @@
 timens
+timerfd

diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile
index 49a9dcc26c3a32990459ecdb66032a93310c9d89..293aed6be95e16e44f71fc5ac3c9fa7edff63c79 100644 (file)
--- a/tools/testing/selftests/timens/Makefile
+++ b/tools/testing/selftests/timens/Makefile
@@ -1,4 +1,4 @@
-TEST_GEN_PROGS := timens
+TEST_GEN_PROGS := timens timerfd
 
 CFLAGS := -Wall -Werror
 LDFLAGS := -lrt

diff --git a/tools/testing/selftests/timens/timerfd.c b/tools/testing/selftests/timens/timerfd.c
new file mode 100644 (file)
index 0000000..eff1ec5
--- /dev/null
+++ b/tools/testing/selftests/timens/timerfd.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sched.h>
+
+#include <sys/timerfd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include "log.h"
+#include "timens.h"
+
+static int tclock_gettime(clock_t clockid, struct timespec *now)
+{
+       if (clockid == CLOCK_BOOTTIME_ALARM)
+               clockid = CLOCK_BOOTTIME;
+       return clock_gettime(clockid, now);
+}
+
+int run_test(int clockid, struct timespec now)
+{
+       struct itimerspec new_value;
+       long long elapsed;
+       int fd, i;
+
+       if (tclock_gettime(clockid, &now))
+               return pr_perror("clock_gettime(%d)", clockid);
+
+       for (i = 0; i < 2; i++) {
+               int flags = 0;
+
+               new_value.it_value.tv_sec = 3600;
+               new_value.it_value.tv_nsec = 0;
+               new_value.it_interval.tv_sec = 1;
+               new_value.it_interval.tv_nsec = 0;
+
+               if (i == 1) {
+                       new_value.it_value.tv_sec += now.tv_sec;
+                       new_value.it_value.tv_nsec += now.tv_nsec;
+               }
+
+               fd = timerfd_create(clockid, 0);
+               if (fd == -1)
+                       return pr_perror("timerfd_create(%d)", clockid);
+
+               if (i == 1)
+                       flags |= TFD_TIMER_ABSTIME;
+
+               if (timerfd_settime(fd, flags, &new_value, NULL))
+                       return pr_perror("timerfd_settime(%d)", clockid);
+
+               if (timerfd_gettime(fd, &new_value))
+                       return pr_perror("timerfd_gettime(%d)", clockid);
+
+               elapsed = new_value.it_value.tv_sec;
+               if (abs(elapsed - 3600) > 60) {
+                       ksft_test_result_fail("clockid: %d elapsed: %lld\n",
+                                             clockid, elapsed);
+                       return 1;
+               }
+
+               close(fd);
+       }
+
+       ksft_test_result_pass("clockid=%d\n", clockid);
+
+       return 0;
+}
+
+int main(int argc, char *argv[])
+{
+       int ret, status, len, fd;
+       char buf[4096];
+       pid_t pid;
+       struct timespec btime_now, mtime_now;
+
+       nscheck();
+
+       ksft_set_plan(3);
+
+       clock_gettime(CLOCK_MONOTONIC, &mtime_now);
+       clock_gettime(CLOCK_BOOTTIME, &btime_now);
+
+       if (unshare_timens())
+               return 1;
+
+       len = snprintf(buf, sizeof(buf), "%d %d 0\n%d %d 0",
+                       CLOCK_MONOTONIC, 70 * 24 * 3600,
+                       CLOCK_BOOTTIME, 9 * 24 * 3600);
+       fd = open("/proc/self/timens_offsets", O_WRONLY);
+       if (fd < 0)
+               return pr_perror("/proc/self/timens_offsets");
+
+       if (write(fd, buf, len) != len)
+               return pr_perror("/proc/self/timens_offsets");
+
+       close(fd);
+       mtime_now.tv_sec += 70 * 24 * 3600;
+       btime_now.tv_sec += 9 * 24 * 3600;
+
+       pid = fork();
+       if (pid < 0)
+               return pr_perror("Unable to fork");
+       if (pid == 0) {
+               ret = 0;
+               ret |= run_test(CLOCK_BOOTTIME, btime_now);
+               ret |= run_test(CLOCK_MONOTONIC, mtime_now);
+               ret |= run_test(CLOCK_BOOTTIME_ALARM, btime_now);
+
+               if (ret)
+                       ksft_exit_fail();
+               ksft_exit_pass();
+               return ret;
+       }
+
+       if (waitpid(pid, &status, 0) != pid)
+               return pr_perror("Unable to wait the child process");
+
+       if (WIFEXITED(status))
+               return WEXITSTATUS(status);
+
+       return 1;
+}