lib: add a function to indicate activity

Signed-off-by: Thomas Wood <thomas.wood@intel.com>

lib/igt_aux.c

@@ -246,6 +246,21 @@ void igt_progress(const char *header, uint64_t i, uint64_t total)
 			 (long long unsigned)i * 100 / total);
 }
 
+/**
+ * igt_print_activity:
+ *
+ * Print a '.' to indicate activity. This is printed without a newline and
+ * only if output is to a terminal.
+ */
+void igt_print_activity(void)
+{
+	if (!isatty(STDOUT_FILENO))
+		return;
+
+	igt_info(".");
+	fflush(stdout);
+}
+
 /* mappable aperture trasher helper */
 drm_intel_bo **trash_bos;
 int num_trash_bos;

lib/igt_aux.h

@@ -41,6 +41,7 @@ void igt_permute_array(void *array, unsigned size,
 						 unsigned i,
 						 unsigned j));
 void igt_progress(const char *header, uint64_t i, uint64_t total);
+void igt_print_activity(void);
 bool igt_check_boolean_env_var(const char *env_var, bool default_value);
 
 bool igt_aub_dump_enabled(void);