Add original unix v6

source/s2/sleep.c

@@ -0,0 +1,21 @@
+main(argc, argv)
+char **argv;
+{
+	int c, n;
+	char *s;
+
+	n = 0;
+	if(argc < 2) {
+		printf("arg count\n");
+		exit();
+	}
+	s = argv[1];
+	while(c = *s++) {
+		if(c<'0' || c>'9') {
+			printf("bad character\n");
+			exit();
+		}
+		n = n*10 + c - '0';
+	}
+	sleep(n);
+}