TCP/IP (Parallel Library) Migration Guide

HP NonStop TCP/IP (Parallel Library) Migration Guide—522272-003
2-1
2 The New Socket Provider
This section describes the new socket provider, TCP Socket Access
Method (TCPSAM). To migrate conventional TCP/IP socket applications to Parallel
Library TCP/IP, read this section to familiarize yourself with how to access and
manage TCPSAM. This section also describes fault-tolerant behavioral differences
between TCPSAM and the conventional TCP/IP process that you should be aware of
when using Parallel Library TCP/IP for socket applications.
TCPSAM is a process pair provided for backward compatibility with conventional
TCP/IP socket applications. TCPSAM is not in the data path but provides applications
with a name for a socket-transport service provider. By specifying the TCPSAM
process as the name of the socket-transport service provider, the application
programmer can access Parallel Library TCP/IP without reconfiguring the application.
There is no restriction on the number of instances of TCPSAM running in a system.
You can name TCPSAMs using the standard process-naming convention including
$ZTCn.
Determining the Name of the Socket Access
Method
In conventional TCP/IP, the transport-service provider was the name of the TCP/IP
process (usually $ZTC0). In Parallel Library TCP/IP, the transport-service provider is
the name of the TCPSAM process. To use Parallel Library TCP/IP for the socket
applications, you need to know the name of the TCPSAM process and set that name to
be the name of the transport-service provider.
To determine the name of a TCPSAM process for use as a transport-service provider,
issue the following command:
This SCF LISTDEV command lists all the TCP/IP processes. In the Program column,
conventional TCP/IP processes have the suffix .TCP/IP; Parallel Library TCP/IP
processes have the suffix .TCPSAM. The following display shows a sample result of
the SCF LISTDEV TCPIP command.
Note. The Expand application expects a TCP/IP process name to start with Z.
-> LISTDEV TCPIP
1 SCF - T9082G02 - (05AUT99) (26JUL99) - 12/22/1999 14:52:00 System \TIGGER
2 Copyright Hewlett-Packard Company
3
4 LDev Name PPID BPID Type RSize Pri Program
5 107 $ZTCP0 0,285 1,287 (48,0) 32000 200 \TIGGER.$SYSTEM.SYS03.TCPIP
6 141 $ZTC03 3,269 0,0 (48,0) 57344 201 \TIGGER.$SYSTEM.SYS03.TCPSAM
7 154 $ZTC0 0,299 1,286 (48,0) 32000 200 \TIGGER.$SYSTEM.SYS03.TCPIP
8 158 $ZTCP1 1,293 0,302 (48,0) 32000 200 \TIGGER.$SYSTEM.SYS03.TCPIP
9 190 $ZTC02 1,310 0.0 (48,0) 57344 201 \TIGGER.$SYSTEM.SYS03.TCPSAM