common-main.c: fflush stdout buffer when exit

Author: chengzhuo5

common-main.c

@@ -86,5 +86,10 @@ int common_exit(const char *file, int line, int code)
 	check_bug_if_BUG();
 	trace2_cmd_exit_fl(file, line, code);
 
+	/**
+	 * Some software (such as security software) may change buffer type of stdout.
+	 * It will no output without fflush manually.
+	 */
+	fflush(stdout);
 	return code;
 }