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Appendix A . System Services Used by BEA Connect TCP for IMS

BEA Connect TCP for IMS uses system services provided by:

IMS
TCP/IP for MVS
LE/370
MVS

Description of IMS Services

BEA Connect TCP for IMS uses the following IMS services by issuing the appropriate API calls.


IMS Service	Description
CHKP (Checkpoint)	Retrieve the first (or only) segment of a message from the IMS Message Queue and commit processing against recoverable IMS resources
CHNG (Change)	Set the destination of a modifiable, Alternate PCB
GN (Get Next)	Retrieve subsequent segments (other than the first) of a message from the IMS Message Queue
GU (Get Unique)	Retrieve the first (or only) segment of a message from the IMS Message Queue
ISRT (Insert)	Insert a message segment into the IMS Message Queue
PURG (Purge)	Inform IMS that all segments related to a particular message have been inserted and that the message is complete

Description of TCP/IP for MVS Services

BEA Connect TCP for IMS makes use of the following TCP/IP for MVS services by issuing the appropriate API calls.


TCP/IP for MVS Service	Description
accept	Accept a TCP/IP connection request
bind	Bind a socket to an IP address and port
close	Close a socket and free associated resources
connect	Initiate a TCP/IP connection with a specified IP address and port
fcntl	Set the operational characteristics of a socket
gethostbyaddr	Resolve an IP address into a domain name
htonl	Convert a long integer from host to network byte order
htons	Convert a short integer from host to network byte order
inet_network	Convert an IP address from character format to internal format
inet_ntoa	Convert an IP address from internal format to character format
listen	Initiate listening on a socket bound to an IP address and port
read	Read data on a TCP/IP connection
selectex	Wait on one or more socket FDs to be posted, a timeout to occur, or an ECB to be posted
setsockopt	Set socket-related processing options
socket	Obtain (allocate) a socket descriptor for a TCP/IP connection
shutdown	Shut down a TCP/IP connection
write	Write data to a TCP/IP connection

Description of LE/370 Services

BEA Connect TCP for IMS makes use of the following LE/370 services by issuing the appropriate API calls.


LE/370 Service	Description
CEE3ABD	Issue an abend

Description of MVS Services

BEA Connect TCP for IMS makes use of the following MVS services by issuing the appropriate API calls.


MVS Service	Description
WTO	Issue a write-to-operator (WTO) message
WTOR	Issue a write-to-operator-with-reply (WTOR) message

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