fixes #12 - exit program with code from cpu.exit_code

riscemu/__main__.py

@@ -121,9 +121,10 @@ if __name__ == '__main__':
 
         # launch the last loaded program
         cpu.launch(cpu.mmu.programs[-1], verbose=cfg.verbosity > 1)
+        sys.exit(cpu.exit_code)
 
     except RiscemuBaseException as e:
         print("Error: {}".format(e.message()))
         e.print_stacktrace()
 
-        sys.exit(1)
+        sys.exit(-1)

riscemu/interactive.py

@@ -1,3 +1,5 @@
+import sys
+
 from riscemu import RunConfig
 from riscemu.types import InstructionMemorySection, SimpleInstruction, Program
 
@@ -22,3 +24,5 @@ if __name__ == '__main__':
     cpu.setup_stack()
 
     cpu.launch(program)
+
+    sys.exit(cpu.exit_code)