Open System Services Management and Operations Guide (G06.30+, H06.08+, J06.03+)

your system. AF_INET sockets provide access through Internet Protocol (IP) version 4 addresses;
AF_INET6 sockets provide access through IP version 6 addresses.
• For Internet domain sockets using NonStop TCP/IP, the socket application communicates with
the $ZTAnn process. The $ZTAnn process in turn provides Internet access through the
transport-provider process of TCP/IP.
• The AF_INET or AF_INET6 transport-provider process is named $ZTCn, $ZSAMn, or another
name chosen by your site. The OSS sockets software assumes that the default name is $ZTC0
when no other process name is specified by an appropriate method. This guide uses $ZTC0
for discussions that involve the Internet domain transport-provider process.
NOTE: A copy of the transport-provider process is not necessarily given the default name
of $ZTC0. However, as long as either the DEFINE =TCPIP^PROCESS^NAME matches the
running transport-provider process or the OSS application selects the transport-provider process
name by calling socket_transport_name_set(), OSS sockets function properly.
See the:
◦ TCP/IP Configuration and Management Manual
◦ TCP/IP (Parallel Library) Configuration and Management Manual
◦ TCP/IPv6 Configuration and Management Manual
for information on the configuration and management of the corresponding transport-provider
process.
• Figure 5 (page 42) shows the processes related to providing OSS AF_INET sockets for
NonStop TCP/IP. The diagram shows two systems, referred to as Node A and Node B, each
with two processors. In Node A, only one of the processors has a transport-provider process
($ZTC0), whereas in Node B, each processor has its own transport-provider process ($ZTC0
and $ZTC1). Each processor has its own transport-agent process ($ZTAnn).
Components to Be Managed 41