qtest: replace gettimeofday with GTimer

glib provides a convenience helper to measure elapsed time. It isn't
subject to wall-clock time changes.

Note that this changes the initial OPENED time, which used to print the
current time.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220307070401.171986-3-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

softmmu/qtest.c

@@ -58,12 +58,12 @@ static FILE *qtest_log_fp;
 static QTest *qtest;
 static GString *inbuf;
 static int irq_levels[MAX_IRQ];
-static qemu_timeval start_time;
+static GTimer *timer;
 static bool qtest_opened;
 static void (*qtest_server_send)(void*, const char*);
 static void *qtest_server_send_opaque;
 
-#define FMT_timeval "%ld.%06ld"
+#define FMT_timeval "%.06f"
 
 /**
  * DOC: QTest Protocol
@@ -264,28 +264,13 @@ static int hex2nib(char ch)
     }
 }
 
-static void qtest_get_time(qemu_timeval *tv)
-{
-    qemu_gettimeofday(tv);
-    tv->tv_sec -= start_time.tv_sec;
-    tv->tv_usec -= start_time.tv_usec;
-    if (tv->tv_usec < 0) {
-        tv->tv_usec += 1000000;
-        tv->tv_sec -= 1;
-    }
-}
-
 static void qtest_send_prefix(CharBackend *chr)
 {
-    qemu_timeval tv;
-
     if (!qtest_log_fp || !qtest_opened) {
         return;
     }
 
-    qtest_get_time(&tv);
-    fprintf(qtest_log_fp, "[S +" FMT_timeval "] ",
-            (long) tv.tv_sec, (long) tv.tv_usec);
+    fprintf(qtest_log_fp, "[S +" FMT_timeval "] ", g_timer_elapsed(timer, NULL));
 }
 
 static void G_GNUC_PRINTF(1, 2) qtest_log_send(const char *fmt, ...)
@@ -386,12 +371,9 @@ static void qtest_process_command(CharBackend *chr, gchar **words)
     command = words[0];
 
     if (qtest_log_fp) {
-        qemu_timeval tv;
         int i;
 
-        qtest_get_time(&tv);
-        fprintf(qtest_log_fp, "[R +" FMT_timeval "]",
-                (long) tv.tv_sec, (long) tv.tv_usec);
+        fprintf(qtest_log_fp, "[R +" FMT_timeval "]", g_timer_elapsed(timer, NULL));
         for (i = 0; words[i]; i++) {
             fprintf(qtest_log_fp, " %s", words[i]);
         }
@@ -846,21 +828,20 @@ static void qtest_event(void *opaque, QEMUChrEvent event)
         for (i = 0; i < ARRAY_SIZE(irq_levels); i++) {
             irq_levels[i] = 0;
         }
-        qemu_gettimeofday(&start_time);
+
+        g_clear_pointer(&timer, g_timer_destroy);
+        timer = g_timer_new();
         qtest_opened = true;
         if (qtest_log_fp) {
-            fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n",
-                    (long) start_time.tv_sec, (long) start_time.tv_usec);
+            fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n", g_timer_elapsed(timer, NULL));
         }
         break;
     case CHR_EVENT_CLOSED:
         qtest_opened = false;
         if (qtest_log_fp) {
-            qemu_timeval tv;
-            qtest_get_time(&tv);
-            fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n",
-                    (long) tv.tv_sec, (long) tv.tv_usec);
+            fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n", g_timer_elapsed(timer, NULL));
         }
+        g_clear_pointer(&timer, g_timer_destroy);
         break;
     default:
         break;