Demo of use of errors in applications.

demos/err/main.c

@@ -0,0 +1,19 @@
+#include <openssl/err.h>
+
+#include "test_err.h"
+
+/* Simple error test routine */
+
+void a_test_function(void)
+	{
+	TESTerr(TEST_F_A_TEST_FUNCTION, TEST_R_TEST_REASON_CODE);
+	TESTerr(TEST_F_A_TEST_FUNCTION, TEST_R_ANOTHER_TEST_REASON_CODE);
+	ERR_add_error_data(1, "some additional error data");
+	}
+
+int main(int argc, char **argv)
+	{
+	ERR_load_TEST_strings();
+	a_test_function();
+	ERR_print_errors_fp(stderr);
+	}