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System Services Descriptions

BEA eLink for Mainframe TCP for IMS (hereafter referenced as eLink TCP for IMS) uses the following system services:

IMS

The eLink TCP for IMS BMP 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

TCP/IP for OS/390

The eLink TCP for IMS product makes use of the following TCP/IP for OS/390 services by issuing the appropriate API calls.


TCP/IP for OS/390 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
gethostbyname	Resolve a hostname 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

LE/370

The eLink TCP for IMS product makes use of the following LE/370 services by issuing the appropriate API calls.


LE/370 Service	Description
CEE3ABD	Issue an abend

OS/390

The eLink TCP for IMS product makes use of the following OS/390 services by issuing the appropriate API calls.


OS/390 Service	Description
WTO	Issue a write-to-operator (WTO) message
WTOR	Issue a write-to-operator-with-reply (WTOR) message
XCF	Uses cross-system coupling facility to communicate to OTMA
Latch Manager Services	Locks storage resources to prevent simultaneous updates of shared memory

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