Programming services

TSO/E provides many services that you can use in system or application programs to perform various tasks. These services consist of programs, macros, and CLISTs.

TSO/E services support a wide range of functions that are useful in writing system programs as well as application programs that exploit the full-screen capabilities of TSO/E.

The following table describes the tasks you can perform and the service(s) that support the task. For complete information about how to use these services, see z/OS TSO/E Programming Services.

Task	Service
Check the syntax of subcommand names	Command scan service routine
Check the syntax of command and subcommand operands	Parse service routine
Control terminal functions and attributes, such as full-screen mode and terminal line size	Terminal control macro instructions
Process terminal I/O and issue messages	BSAM and QSAM macro instructions TSO/E I/O service routines TGET/TPUT/TPG TSO/E message handling routine
Retrieve system messages that are issued during a console session	GETMSG service
Cause the system to recognize and schedule an attention exit that receives control when an attention interruption occurs	STAX service routine
Process a CLIST's attention routine when an attention interruption occurs	CLIST attention facility
Obtain a list of data set names that match specified criteria	ICQGCL00
Ensure that a specified data set has adequate free space for additional data	Space management CLIST
Create or delete alternative library environments and modify alternative library definitions for CLIST and REXX libraries	Alternative library interface routine
Allocate, free, concatenate, and deconcatenate data sets during program execution	Dynamic allocation interface routine
Retrieve information from the system catalog, such as data set name, index name, control volume address or volume ID	Catalog information routine
Construct a fully-qualified data set name when a partially-qualified name is entered by a terminal user	Default service routine
Analyze return codes from dynamic allocation or DAIR and issue appropriate error messages	DAIRFAIL routine
Analyze VSAM macro instruction failures, subsystem request failures, parse service routine or PUTLINE failures, and ABEND codes, and issue an appropriate error message	GNRLFAIL/VSAMFAIL routine
Determine if a command or program is authorized; determine if a command is not supported in the background	Table look-up service
Invoke commands, CLISTs, REXX execs and other programs Note: Unauthorized programs can use the TSO/E service facility to invoke APF-authorized functions.	TSO/E service facility
Establish a TSO/E environment outside of the TSO/E TMP	TSO/E environment service
Create, update, and return the values of CLIST and REXX variables	Variable access routine
Retrieve information from the Information Center Facility's names directory, such as phone numbers, user IDs, and addresses for specified names	ICQCAL00 program
Display lists of printers for users to select and to print data sets on selected printers	Printer support CLISTs
Invoke Information Center Facility applications	Application invocation function (ICQAMLIO)