Technical Reference: Base Operating System and Extensions, Volume 2

swapqry Subroutine

Purpose

Returns paging device status.

Library

Standard C Library (libc.a)

Syntax

#include <sys/vminfo.h> int swapqry (PathName, Buffer) char *PathName; struct pginfo *Buffer;

Description

The swapqry subroutine returns information to a user-designated buffer about active paging and swap devices.

Parameters

PathName	Specifies the full path name of the block device.
Buffer	Points to the buffer into which the status is stored.

Return Values

The swapqry subroutine returns 0 if the PathName value is an active paging device. If the Buffer value is not null, it also returns status information.

Error Codes

If an error occurs, the subroutine returns -1 and the errno global variable is set to indicate the error, as follows:

EFAULT	Buffer pointer is invalid.
EINVAL	Invalid argument.
EINTR	Signal was received while processing request.
ENODEV	Device is not an active paging device.
ENOENT	The PathName file does not exist.
ENOTBLK	Block device required.
ENOTDIR	A component of the PathName prefix is not a directory.
ENXIO	No such device address.

Related Information

The swapoff subroutine, swapon subroutine.

The swapoff command, swapon command.

Paging Space Overview in AIX 5L Version 5.2 System Management Concepts: Operating System and Devices.

Subroutines Overview and Understanding Paging Space Programming Requirements in AIX 5L Version 5.2 General Programming Concepts: Writing and Debugging Programs.