add most files

sys_select.h

@@ -0,0 +1,20 @@
+#ifndef SYS_SELECT_H_
+#define SYS_SELECT_H_
+
+#include <sys/time.h>
+
+int sys_select_or_key(fd_set *mask, int msecTmo, int *key);
+/*
+   wait for read event on sockets included in mask or from keyboard or a timeout
+   result is negative for timeout,
+   STDIN_FILENO for a key pressed,
+   else socket number
+   switches the terminal to no-echo no-canonical 
+*/
+
+void sys_keys_off(void);
+/*
+   switch back terminal to normal state
+*/
+
+#endif /* SYS_SELECT_H_ */