api c programming computer networking java network linux programming network network programming network security networking socket socket programming theory of computation unix unix network programming computing computer programming system software x window system application programming interfaces open transport transport layer interface w. richard stevens advanced operating system computing platforms man page single unix specification posix ieee standards make (software) the open group internet tcp tcp/ip internet protocol suite transmission control protocol internet protocol ipv6 network architecture internet protocols user datagram protocol ip (struct) ipv4 raw socket computer science inter-process communication concurrent computing semaphore (programming) message queue unix system v shared memory fifo (computing)