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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:

- TCP/IP for OS/390

- LE/370

- OS/390

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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