[PATCH 6/6] selftests: vDSO: vdso_test_correctness: Add a test for time()

[Thomas Weißschuh]

Extend the test to also cover the time() function.

Signed-off-by: Thomas Weißschuh <thomas.weisssc...@linutronix.de>
---
 .../testing/selftests/vDSO/vdso_test_correctness.c | 57 ++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/tools/testing/selftests/vDSO/vdso_test_correctness.c 
b/tools/testing/selftests/vDSO/vdso_test_correctness.c
index a94ab4d597b1..a3634e4980b5 100644
--- a/tools/testing/selftests/vDSO/vdso_test_correctness.c
+++ b/tools/testing/selftests/vDSO/vdso_test_correctness.c
@@ -55,6 +55,10 @@ typedef long (*vgtod_t)(struct timeval *tv, struct timezone 
*tz);
 
 vgtod_t vdso_gettimeofday;
 
+typedef time_t (*vtime_t)(__kernel_time_t *tloc);
+
+vtime_t vdso_time;
+
 typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
 
 getcpu_t vgetcpu;
@@ -133,6 +137,10 @@ static void fill_function_pointers(void)
        if (!vdso_gettimeofday)
                printf("Warning: failed to find gettimeofday in vDSO\n");
 
+       vdso_time = (vtime_t)vdso_sym(version, name[2]);
+       if (!vdso_time)
+               printf("Warning: failed to find time in vDSO\n");
+
 }
 
 static long sys_getcpu(unsigned * cpu, unsigned * node,
@@ -156,6 +164,11 @@ static inline int sys_gettimeofday(struct timeval *tv, 
struct timezone *tz)
        return syscall(__NR_gettimeofday, tv, tz);
 }
 
+static inline time_t sys_time(__kernel_time_t *tloc)
+{
+       return syscall(__NR_time, tloc);
+}
+
 static void test_getcpu(void)
 {
        printf("[RUN]\tTesting getcpu...\n");
@@ -422,6 +435,49 @@ static void test_gettimeofday(void)
        VDSO_CALL(vdso_gettimeofday, 2, &vdso, NULL);
 }
 
+static void test_time(void)
+{
+       __kernel_old_time_t start, end, vdso_ret, vdso_param;
+
+       if (!vdso_time)
+               return;
+
+       printf("[RUN]\tTesting time...\n");
+
+       if (sys_time(&start) < 0) {
+               printf("[FAIL]\tsys_time failed (%d)\n", errno);
+               nerrs++;
+               return;
+       }
+
+       vdso_ret = VDSO_CALL(vdso_time, 1, &vdso_param);
+       end = sys_time(NULL);
+
+       if (vdso_ret < 0 || end < 0) {
+               printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
+                      (int)vdso_ret, errno);
+               nerrs++;
+               return;
+       }
+
+       printf("\t%lld %lld %lld\n",
+              (long long)start,
+              (long long)vdso_ret,
+              (long long)end);
+
+       if (vdso_ret != vdso_param) {
+               printf("[FAIL]\tinconsistent return values: %lld %lld\n",
+                      (long long)vdso_ret, (long long)vdso_param);
+               nerrs++;
+               return;
+       }
+
+       if (!(start <= vdso_ret) || !(vdso_ret <= end)) {
+               printf("[FAIL]\tTimes are out of sequence\n");
+               nerrs++;
+       }
+}
+
 int main(int argc, char **argv)
 {
        version = versions[VDSO_VERSION];
@@ -432,6 +488,7 @@ int main(int argc, char **argv)
        test_clock_gettime();
        test_clock_gettime64();
        test_gettimeofday();
+       test_time();
 
        /*
         * Test getcpu() last so that, if something goes wrong setting affinity,

-- 
2.52.0