fig1_pipe.c fig3_socketpair.c fig5a_unix_socket_read.c fig5b_unix_socket_write.c fig6a_inet_datagram_read.c fig6b_inet_datagram_write.c fig7a_inet_stream_client.c fig7b_inet_stream_server.c fig7c_inet_stream_server.c fig9a_unix_stream_write.c fig9b_unix_stream_read.c