--- a/fuzz-wrapfd.h	Fri Nov 13 23:16:50 2020 +0800
+++ b/fuzz-wrapfd.h	Fri Nov 13 23:18:05 2020 +0800
@@ -6,12 +6,14 @@
 enum wrapfd_mode {
     UNUSED = 0,
     COMMONBUF, // using the common buffer
+    DUMMY, // reads return fixed output, of random length
 };
 
 // buf is a common buffer read by all wrapped FDs. doesn't take ownership of buf
 void wrapfd_setup(buffer *buf);
 void wrapfd_setseed(uint32_t seed);
-int wrapfd_new();
+int wrapfd_new_fuzzinput();
+int wrapfd_new_dummy();
 
 // called via #defines for read/write/select
 int wrapfd_read(int fd, void *out, size_t count);