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Glossary
Exec
The kernel of the OS 2200 system that controls the operating environment. The Exec
process user runs, controls files, manages the system resources, and performs input and
output operations. The active Exec is the Exec that is currently booted. The default
Exec is the Exec to be booted the next time the device is manually selected as the boot
device without explicitly selecting, through the SCF interface, an Exec to boot.
Executive request (ER)
A machine instruction that allows a user to request services from the kernel, or
F
A system call to the OS 2200 Exec that asks the Exec to perform a task (such as I/O) that
is normally privileged and outside the control of the user. The ER is the standard
interface between programs and the operating system, providing programs with access
to system resources under Exec control. Selected ERs affect system security and their
ability to be executed is controlled, or
A program instruction that interrupts the Exec and has it perform a function for the
program. An ER can be used to read or print data, request system information, and
terminate a program. Executive request also refers to the service resulting from the
request.
Fault Location by Interpretive Testing (FLIT)
A tool for development, checkout, installation, and maintenance of software, and for
solving complex debugging problems. FLIT provides a simulated operating environment
where you can run and debug any OS 2200 compatible executable program. Working in
this simulated environment, a programmer can load and execute object code, trace
execution of the code, and change it dynamically without recompiling. Debugging is
controlled by a high-level language (HLL) or low-level language (LLL). Typically, Meta-
Assembler (MASM) programs are debugged using LLL, and PLUS programs are
debugged using HLL. In system mode, you can customize the hardware environment
and boot, run, and debug your own operating system or control program.
FURPUR
The operating system Executive file utility routine. Abbreviation for File Utility
Routines/Program Utility Routines.
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