oshi.driver.unix.solaris.Who Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of oshi-core-java11 Show documentation
The newest version!
/*
 * Copyright 2020-2023 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.driver.unix.solaris;

import static oshi.jna.platform.unix.CLibrary.LOGIN_PROCESS;
import static oshi.jna.platform.unix.CLibrary.USER_PROCESS;
import static oshi.util.Util.isSessionValid;

import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

import com.sun.jna.Native;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.jna.platform.unix.SolarisLibc;
import oshi.jna.platform.unix.SolarisLibc.SolarisUtmpx;
import oshi.software.os.OSSession;

/**
 * Utility to query logged in users.
 */
@ThreadSafe
public final class Who {

    private static final SolarisLibc LIBC = SolarisLibc.INSTANCE;

    private Who() {
    }

    /**
     * Query {@code getutxent} to get logged in users.
     *
     * @return A list of logged in user sessions
     */
    public static synchronized List queryUtxent() {
        List whoList = new ArrayList<>();
        SolarisUtmpx ut;
        // Rewind
        LIBC.setutxent();
        try {
            // Iterate
            while ((ut = LIBC.getutxent()) != null) {
                if (ut.ut_type == USER_PROCESS || ut.ut_type == LOGIN_PROCESS) {
                    String user = Native.toString(ut.ut_user, StandardCharsets.US_ASCII);
                    String device = Native.toString(ut.ut_line, StandardCharsets.US_ASCII);
                    String host = Native.toString(ut.ut_host, StandardCharsets.US_ASCII);
                    long loginTime = ut.ut_tv.tv_sec.longValue() * 1000L + ut.ut_tv.tv_usec.longValue() / 1000L;
                    // Sanity check. If errors, default to who command line
                    if (!isSessionValid(user, device, loginTime)) {
                        return oshi.driver.unix.Who.queryWho();
                    }
                    whoList.add(new OSSession(user, device, loginTime, host));
                }
            }
        } finally {
            // Close
            LIBC.endutxent();
        }
        return whoList;
    }
}