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/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.util.platform.mac;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.ptr.IntByReference;
import oshi.jna.platform.mac.SystemB;
/**
* Provides access to sysctl calls on OS X
*
* @author widdis[at]gmail[dot]com
*/
public class SysctlUtil {
private static final Logger LOG = LoggerFactory.getLogger(SysctlUtil.class);
/**
* Executes a sysctl call with an int result
*
* @param name
* name of the sysctl
* @param def
* default int value
* @return The int result of the call if successful; the default otherwise
*/
public static int sysctl(String name, int def) {
IntByReference size = new IntByReference(SystemB.INT_SIZE);
Pointer p = new Memory(size.getValue());
if (0 != SystemB.INSTANCE.sysctlbyname(name, p, size, null, 0)) {
LOG.error("Failed sysctl call: {}, Error code: {}", name, Native.getLastError());
return def;
}
return p.getInt(0);
}
/**
* Executes a sysctl call with a long result
*
* @param name
* name of the sysctl
* @param def
* default long value
* @return The long result of the call if successful; the default otherwise
*/
public static long sysctl(String name, long def) {
IntByReference size = new IntByReference(SystemB.UINT64_SIZE);
Pointer p = new Memory(size.getValue());
if (0 != SystemB.INSTANCE.sysctlbyname(name, p, size, null, 0)) {
LOG.error("Failed syctl call: {}, Error code: {}", name, Native.getLastError());
return def;
}
return p.getLong(0);
}
/**
* Executes a sysctl call with a String result
*
* @param name
* name of the sysctl
* @param def
* default String value
* @return The String result of the call if successful; the default
* otherwise
*/
public static String sysctl(String name, String def) {
// Call first time with null pointer to get value of size
IntByReference size = new IntByReference();
if (0 != SystemB.INSTANCE.sysctlbyname(name, null, size, null, 0)) {
LOG.error("Failed syctl call: {}, Error code: {}", name, Native.getLastError());
return def;
}
// Add 1 to size for null terminated string
Pointer p = new Memory(size.getValue() + 1);
if (0 != SystemB.INSTANCE.sysctlbyname(name, p, size, null, 0)) {
LOG.error("Failed syctl call: {}, Error code: {}", name, Native.getLastError());
return def;
}
return p.getString(0);
}
/**
* Executes a sysctl call with a Structure result
*
* @param name
* name of the sysctl
* @param struct
* structure for the result
* @return True if structure is successfuly populated, false otherwise
*/
public static boolean sysctl(String name, Structure struct) {
if (0 != SystemB.INSTANCE.sysctlbyname(name, struct.getPointer(), new IntByReference(struct.size()), null, 0)) {
LOG.error("Failed syctl call: {}, Error code: {}", name, Native.getLastError());
return false;
}
struct.read();
return true;
}
}
