make multicore optional

fuzzers/wcet_qemu_sys/src/bin/fuzzer.rs

@@ -302,7 +302,7 @@ fn fuzz(
     });
 
     //====== Child Function
-    let mut run_client = |state: Option<StdState<_, _, _, _, _>>, mut mgr, _core_id| {
+    let mut run_client = |state: Option<StdState<_, _, _, _, _>>, mut mgr, _core_id| -> std::result::Result<(), libafl::Error> {
 
     //====== Set up Emu and termination-point
     let emu = Emulator::new(&args, &env);
@@ -467,6 +467,7 @@ fn fuzz(
     #[cfg(unix)]
     let file_null = File::open("/dev/null")?;
     #[cfg(unix)]
+    #[cfg(feature = "multicore")]
     {
         let null_fd = file_null.as_raw_fd();
         dup2(null_fd, io::stdout().as_raw_fd())?;
@@ -482,6 +483,9 @@ fn fuzz(
 
     };
 
+    // Multicore Variant
+    #[cfg(feature = "multicore")]
+    {
         match Launcher::builder()
             .shmem_provider(shmem_provider)
             .configuration(EventConfig::AlwaysUnique)
@@ -498,4 +502,13 @@ fn fuzz(
             Err(e) => panic!("{:?}", e),
         };
         Ok(())
+    }
+
+    // Simple Variant
+    #[cfg(not(feature = "multicore"))]
+    {
+        let stats = SimpleStats::new(|s| println!("{}", s));
+        let mgr = SimpleEventManager::new(stats);
+        run_client(None, mgr, 0)
+    }
 }