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Introduction

SAS/C Software provides a number of C macros and functions that allow you to issue common OS/390 and CMS system macros without having to code any assembler language. Interfaces are provided supporting low-level memory allocation, terminal I/O, and multitasking (OS/390 only). Most of these macros and functions can be used with either the standard SAS/C Library or with the Systems Programming Environment (SPE). In a few cases, macros can be used only with SPE, due to the existence of conflicting functionality in the standard SAS/C Library. (For instance, the STIMER macro conflicts with the standard alarm function.) Declarations for the SPE-only functions are collected in the header file <spetask.h> .

These interfaces provide little functionality beyond that available using standard system assembler macros like ATTACH and DETACH. Their purpose is the convenience of avoiding assembler interface routines rather than functional enhancements. The syntactic form of the SAS/C low-level macros and functions has been defined to be as similar as possible to the assembler macros, which facilitates the use of the assembler documentation. (See IBM's MVS/ESA Application Development Reference: Services for Assembler Language Programs and VM/ESA CMS Application Development Reference for Assembler.)

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