HP Rp3440-4 - 9000 - 0 MB RAM Programmer's Manual page 19

socket address For the internet address family (AF_INET), the
socket address consists of the internet address, port
address and address family of a socket. The internet
and port address combination allows the network to
locate a socket. For UNIX Domain (AF_UNIX), the
socket address is the directory pathname bound to
the socket.
socket A socket descriptor is an HP-UX file descriptor that
descriptor references a socket instead of an ordinary file.
Therefore, it can be used for reading, writing, or
most standard file system calls after a BSD Sockets
connection is established. System calls that use file
descriptors (e.g. read, write, select) can be used
with socket descriptors. All BSD Sockets functions
use socket descriptors as arguments.
TCP Provides the underlying communication support for
stream sockets. The Transmission Control Protocol
(TCP) is used to implement reliable, sequenced,
flow-controlled two-way communication based on
byte streams similar to pipes. Refer to the tcp(7p)
man page for more information on TCP.
UDP Provides the underlying communication support for
datagram sockets. The User Datagram Protocol
(UDP) is an unreliable protocol. A process receiving
messages on a datagram socket could find messages
are duplicated, out-of-sequence, or missing.
Messages retain their record boundaries and are
sent as individually addressed packets. There is no
concept of a connection between the communicating
sockets. Refer to the udp(7p) man page for more
information on UDP.
UNIX Domain In addition, the UNIX Domain protocol may be used
Protocol with AF_UNIX sockets for interprocess
communication on the same node. Refer to the
unix(7p) man page for more information on the
UNIX Domain protocol.
Chapter 1
BSD Sockets Concepts
Introduction
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