Sep 2009 Port Check Program (in C) Part 4 In part 1 an examination of creating an ultra simple single port single host port check program was done. Part two of the series the code was broken out between a header file and source file, input validation added, a usage message defined and a Makefile was setup for simple recompiling. The most recent installment added a timed host pre-check component to ensure that a connect() would not potentially "sit and spin" when a host is not available.