Files Reference

param.h File

Purpose

Describes system parameters.

Description

Certain parameters vary for different hardware that uses the operating system. These parameters are defined in the /usr/include/sys/param.h file. The most significant parameters are:

NCARGS	Indicates the default number of characters, including terminating null characters, that can be passed using the exec subroutine.
UBSIZE	The unit used by the statistics subroutines for returning block sizes of files.

This file also contains macros for manipulating machine-dependent fields.

Programs that are intended to comply with the POSIX standard should include the /usr/include/sys/limits.h file rather than the param.h file.

Implementation Specifics

This file is part of Base Operating System (BOS) Runtime.

Related Information

The exec subroutine.

The Header Files Overview defines header files, describes how they are used, and lists several of the header files for which information is provided in this documentation.

The Kernel Tunable Parameters in AIX 5L Version 5.1 Performance Management Guidefor information on tuning the System Configuration value of the argument list.