diff --git a/src/unix.h b/src/unix.h
new file mode 100644
index 0000000..0cc61a6
--- /dev/null
+++ b/src/unix.h
@@ -0,0 +1,46 @@
+#ifndef _UNIX_H
+#define _UNIX_H
+
+#include "config.h"
+
+#ifndef NUMLINKS
+#define NUMLINKS 4
+#endif
+
+extern int  availbyte(int fd);
+extern char inbyte(int fd);
+extern int  outbyte(int fd,char x);
+/*
+  Under UNIX we use named FS FIFOs for node-node communication.
+  The FIFOs are connected to links. 
+  All port fifo file deescriptors
+  
+    
+    [N0} P0   --- P0 [N1]
+    P1
+    |
+    |
+    P2
+    [N2] 
+*/
+extern char *portfilerd[NUMPORTS];
+extern char *portfilewr[NUMPORTS];
+
+
+int   ioinit();
+int   iowait(context_t *C, int nonblock);
+
+char* readFile(char *path);
+
+// FIFO communication 
+int   port_open();
+void  port_close();
+
+// Timer support
+int   timer_init();
+int   timer_start(int index, int millis);
+int   timer_stop(int index);
+
+void vLog(const char* fmtStr, ...);
+
+#endif