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/* Copyright (c) 2017 Daniel Widdis, All Rights Reserved
*
* The contents of this file is dual-licensed under 2
* alternative Open Source/Free licenses: LGPL 2.1 or later and
* Apache License 2.0. (starting with JNA version 4.0.0).
*
* You can freely decide which license you want to apply to
* the project.
*
* You may obtain a copy of the LGPL License at:
*
* http://www.gnu.org/licenses/licenses.html
*
* A copy is also included in the downloadable source code package
* containing JNA, in file "LGPL2.1".
*
* You may obtain a copy of the Apache License at:
*
* http://www.apache.org/licenses/
*
* A copy is also included in the downloadable source code package
* containing JNA, in file "AL2.0".
*/
package com.sun.jna.platform.linux;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.NativeLong;
import com.sun.jna.Structure;
import com.sun.jna.Structure.FieldOrder;
import com.sun.jna.platform.unix.LibCAPI;
/**
* LibC structures and functions unique to Linux
*/
public interface LibC extends LibCAPI, Library {
String NAME = "c";
LibC INSTANCE = Native.load(NAME, LibC.class);
@FieldOrder({ "uptime", "loads", "totalram", "freeram", "sharedram", "bufferram", "totalswap", "freeswap", "procs",
"totalhigh", "freehigh", "mem_unit", "_f" })
class Sysinfo extends Structure {
private static final int PADDING_SIZE = 20 - 2 * NativeLong.SIZE - 4;
public NativeLong uptime; // Seconds since boot
// 1, 5, and 15 minute load averages, divide by 2^16
public NativeLong[] loads = new NativeLong[3];
public NativeLong totalram; // Total usable main memory size
public NativeLong freeram; // Available memory size
public NativeLong sharedram; // Amount of shared memory
public NativeLong bufferram; // Memory used by buffers
public NativeLong totalswap; // Total swap space size
public NativeLong freeswap; // swap space still available
public short procs; // Number of current processes
public NativeLong totalhigh; // Total high memory size
public NativeLong freehigh; // Available high memory size
public int mem_unit; // Memory unit size in bytes
// Padding to 64 bytes
public byte[] _f = new byte[PADDING_SIZE];
/*
* getFieldList and getFieldOrder are overridden because PADDING_SIZE
* might be 0 - that is a GCC only extension and not supported by JNA
*
* The dummy field at the end of the structure is just padding and so if
* the field is the zero length array, it is stripped from the fields
* and field order.
*/
@Override
protected List getFieldList() {
List fields = new ArrayList(super.getFieldList());
if (PADDING_SIZE == 0) {
Iterator fieldIterator = fields.iterator();
while (fieldIterator.hasNext()) {
Field field = fieldIterator.next();
if ("_f".equals(field.getName())) {
fieldIterator.remove();
}
}
}
return fields;
}
@Override
protected List getFieldOrder() {
List fieldOrder = new ArrayList(super.getFieldOrder());
if (PADDING_SIZE == 0) {
fieldOrder.remove("_f");
}
return fieldOrder;
}
}
@FieldOrder({ "f_bsize", "f_frsize", "f_blocks", "f_bfree", "f_bavail",
"f_files", "f_ffree", "f_favail", "f_fsid", "_f_unused", "f_flag",
"f_namemax", "_f_spare" })
class Statvfs extends Structure {
public NativeLong f_bsize;
public NativeLong f_frsize;
public NativeLong f_blocks;
public NativeLong f_bfree;
public NativeLong f_bavail;
public NativeLong f_files;
public NativeLong f_ffree;
public NativeLong f_favail;
public NativeLong f_fsid;
public int _f_unused; // Only in 32-bit
public NativeLong f_flag;
public NativeLong f_namemax;
public int[] _f_spare = new int[6];
/*
* getFieldList and getFieldOrder are overridden because _f_unused is
* only present in 32-bit wordsize. The dummy field in the structure is
* just padding and so if the field is the zero length array, it is
* stripped from the fields and field order.
*/
@Override
protected List getFieldList() {
List fields = new ArrayList(super.getFieldList());
if (NativeLong.SIZE > 4) {
Iterator fieldIterator = fields.iterator();
while (fieldIterator.hasNext()) {
Field field = fieldIterator.next();
if ("_f_unused".equals(field.getName())) {
fieldIterator.remove();
}
}
}
return fields;
}
@Override
protected List getFieldOrder() {
List fieldOrder = new ArrayList(super.getFieldOrder());
if (NativeLong.SIZE > 4) {
fieldOrder.remove("_f_unused");
}
return fieldOrder;
}
}
/**
* sysinfo() provides a simple way of getting overall system statistics.
* This is more portable than reading /dev/kmem.
*
* @param info
* A Sysinfo structure which will be populated
* @return On success, zero is returned. On error, -1 is returned, and errno
* is set appropriately.
*/
int sysinfo(Sysinfo info);
/**
* The function statvfs() returns information about a mounted filesystem.
*
* @param path
* the pathname of any file within the mounted filesystem.
* @param buf
* a pointer to a statvfs structure
* @return On success, zero is returned. On error, -1 is returned, and errno
* is set appropriately.
*/
int statvfs(String path, Statvfs buf);
}