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@@ -17,6 +17,7 @@
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#include <errno.h>
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#include <sched.h>
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#include <stdbool.h>
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+#include <limits.h>
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#ifndef SYS_getcpu
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# ifdef __x86_64__
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@@ -31,6 +32,14 @@
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int nerrs = 0;
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+typedef int (*vgettime_t)(clockid_t, struct timespec *);
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+
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+vgettime_t vdso_clock_gettime;
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+
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+typedef long (*vgtod_t)(struct timeval *tv, struct timezone *tz);
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+
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+vgtod_t vdso_gettimeofday;
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+
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typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
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getcpu_t vgetcpu;
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@@ -95,6 +104,15 @@ static void fill_function_pointers()
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printf("Warning: failed to find getcpu in vDSO\n");
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vgetcpu = (getcpu_t) vsyscall_getcpu();
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+
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+ vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
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+ if (!vdso_clock_gettime)
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+ printf("Warning: failed to find clock_gettime in vDSO\n");
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+
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+ vdso_gettimeofday = (vgtod_t)dlsym(vdso, "__vdso_gettimeofday");
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+ if (!vdso_gettimeofday)
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+ printf("Warning: failed to find gettimeofday in vDSO\n");
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+
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}
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static long sys_getcpu(unsigned * cpu, unsigned * node,
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@@ -103,6 +121,16 @@ static long sys_getcpu(unsigned * cpu, unsigned * node,
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return syscall(__NR_getcpu, cpu, node, cache);
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}
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+static inline int sys_clock_gettime(clockid_t id, struct timespec *ts)
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+{
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+ return syscall(__NR_clock_gettime, id, ts);
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+}
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+
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+static inline int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
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+{
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+ return syscall(__NR_gettimeofday, tv, tz);
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+}
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+
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static void test_getcpu(void)
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{
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printf("[RUN]\tTesting getcpu...\n");
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@@ -155,10 +183,154 @@ static void test_getcpu(void)
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}
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}
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+static bool ts_leq(const struct timespec *a, const struct timespec *b)
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+{
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+ if (a->tv_sec != b->tv_sec)
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+ return a->tv_sec < b->tv_sec;
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+ else
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+ return a->tv_nsec <= b->tv_nsec;
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+}
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+
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+static bool tv_leq(const struct timeval *a, const struct timeval *b)
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+{
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+ if (a->tv_sec != b->tv_sec)
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+ return a->tv_sec < b->tv_sec;
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+ else
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+ return a->tv_usec <= b->tv_usec;
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+}
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+
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+static char const * const clocknames[] = {
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+ [0] = "CLOCK_REALTIME",
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+ [1] = "CLOCK_MONOTONIC",
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+ [2] = "CLOCK_PROCESS_CPUTIME_ID",
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+ [3] = "CLOCK_THREAD_CPUTIME_ID",
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+ [4] = "CLOCK_MONOTONIC_RAW",
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+ [5] = "CLOCK_REALTIME_COARSE",
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+ [6] = "CLOCK_MONOTONIC_COARSE",
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+ [7] = "CLOCK_BOOTTIME",
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+ [8] = "CLOCK_REALTIME_ALARM",
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+ [9] = "CLOCK_BOOTTIME_ALARM",
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+ [10] = "CLOCK_SGI_CYCLE",
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+ [11] = "CLOCK_TAI",
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+};
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+
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+static void test_one_clock_gettime(int clock, const char *name)
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+{
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+ struct timespec start, vdso, end;
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+ int vdso_ret, end_ret;
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+
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+ printf("[RUN]\tTesting clock_gettime for clock %s (%d)...\n", name, clock);
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+
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+ if (sys_clock_gettime(clock, &start) < 0) {
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+ if (errno == EINVAL) {
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+ vdso_ret = vdso_clock_gettime(clock, &vdso);
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+ if (vdso_ret == -EINVAL) {
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+ printf("[OK]\tNo such clock.\n");
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+ } else {
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+ printf("[FAIL]\tNo such clock, but __vdso_clock_gettime returned %d\n", vdso_ret);
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+ nerrs++;
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+ }
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+ } else {
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+ printf("[WARN]\t clock_gettime(%d) syscall returned error %d\n", clock, errno);
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+ }
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+ return;
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+ }
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+
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+ vdso_ret = vdso_clock_gettime(clock, &vdso);
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+ end_ret = sys_clock_gettime(clock, &end);
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+
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+ if (vdso_ret != 0 || end_ret != 0) {
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+ printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
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+ vdso_ret, errno);
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+ nerrs++;
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+ return;
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+ }
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+
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+ printf("\t%llu.%09ld %llu.%09ld %llu.%09ld\n",
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+ (unsigned long long)start.tv_sec, start.tv_nsec,
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+ (unsigned long long)vdso.tv_sec, vdso.tv_nsec,
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+ (unsigned long long)end.tv_sec, end.tv_nsec);
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+
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+ if (!ts_leq(&start, &vdso) || !ts_leq(&vdso, &end)) {
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+ printf("[FAIL]\tTimes are out of sequence\n");
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+ nerrs++;
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+ }
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+}
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+
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+static void test_clock_gettime(void)
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+{
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+ for (int clock = 0; clock < sizeof(clocknames) / sizeof(clocknames[0]);
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+ clock++) {
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+ test_one_clock_gettime(clock, clocknames[clock]);
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+ }
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+
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+ /* Also test some invalid clock ids */
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+ test_one_clock_gettime(-1, "invalid");
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+ test_one_clock_gettime(INT_MIN, "invalid");
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+ test_one_clock_gettime(INT_MAX, "invalid");
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+}
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+
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+static void test_gettimeofday(void)
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+{
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+ struct timeval start, vdso, end;
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+ struct timezone sys_tz, vdso_tz;
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+ int vdso_ret, end_ret;
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+
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+ if (!vdso_gettimeofday)
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+ return;
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+
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+ printf("[RUN]\tTesting gettimeofday...\n");
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+
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+ if (sys_gettimeofday(&start, &sys_tz) < 0) {
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+ printf("[FAIL]\tsys_gettimeofday failed (%d)\n", errno);
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+ nerrs++;
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+ return;
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+ }
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+
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+ vdso_ret = vdso_gettimeofday(&vdso, &vdso_tz);
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+ end_ret = sys_gettimeofday(&end, NULL);
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+
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+ if (vdso_ret != 0 || end_ret != 0) {
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+ printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
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+ vdso_ret, errno);
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+ nerrs++;
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+ return;
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+ }
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+
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+ printf("\t%llu.%06ld %llu.%06ld %llu.%06ld\n",
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+ (unsigned long long)start.tv_sec, start.tv_usec,
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+ (unsigned long long)vdso.tv_sec, vdso.tv_usec,
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+ (unsigned long long)end.tv_sec, end.tv_usec);
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+
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+ if (!tv_leq(&start, &vdso) || !tv_leq(&vdso, &end)) {
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+ printf("[FAIL]\tTimes are out of sequence\n");
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+ nerrs++;
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+ }
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+
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+ if (sys_tz.tz_minuteswest == vdso_tz.tz_minuteswest &&
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+ sys_tz.tz_dsttime == vdso_tz.tz_dsttime) {
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+ printf("[OK]\ttimezones match: minuteswest=%d, dsttime=%d\n",
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+ sys_tz.tz_minuteswest, sys_tz.tz_dsttime);
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+ } else {
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+ printf("[FAIL]\ttimezones do not match\n");
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+ nerrs++;
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+ }
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+
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+ /* And make sure that passing NULL for tz doesn't crash. */
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+ vdso_gettimeofday(&vdso, NULL);
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+}
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+
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int main(int argc, char **argv)
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{
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fill_function_pointers();
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+ test_clock_gettime();
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+ test_gettimeofday();
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+
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+ /*
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+ * Test getcpu() last so that, if something goes wrong setting affinity,
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+ * we still run the other tests.
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+ */
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test_getcpu();
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return nerrs ? 1 : 0;
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Greg Kroah-Hartman