Implementato correttamente la select

test/test3.c

@@ -0,0 +1,18 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+
+int main (int index, char** in_data){
+     
+fprintf(stdout, "%d\n",fileno(stdout));
+fprintf(stdout, "%d\n",fileno(stdin));
+fprintf(stdout, "%d\n",fileno(stderr));
+     
+     
+     return 0;
+}