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1   /*
2    * Copyright 2020-2023 The OSHI Project Contributors
3    * SPDX-License-Identifier: MIT
4    */
5   package oshi.driver.mac;
6   
7   import static oshi.jna.platform.unix.CLibrary.LOGIN_PROCESS;
8   import static oshi.jna.platform.unix.CLibrary.USER_PROCESS;
9   import static oshi.util.Util.isSessionValid;
10  
11  import java.nio.charset.StandardCharsets;
12  import java.util.ArrayList;
13  import java.util.List;
14  
15  import com.sun.jna.Native;
16  
17  import oshi.annotation.concurrent.ThreadSafe;
18  import oshi.jna.platform.mac.SystemB;
19  import oshi.jna.platform.mac.SystemB.MacUtmpx;
20  import oshi.software.os.OSSession;
21  
22  /**
23   * Utility to query logged in users.
24   */
25  @ThreadSafe
26  public final class Who {
27  
28      private static final SystemB SYS = SystemB.INSTANCE;
29  
30      private Who() {
31      }
32  
33      /**
34       * Query {@code getutxent} to get logged in users.
35       *
36       * @return A list of logged in user sessions
37       */
38      public static synchronized List<OSSession> queryUtxent() {
39          List<OSSession> whoList = new ArrayList<>();
40          MacUtmpx ut;
41          // Rewind
42          SYS.setutxent();
43          try { // Iterate
44              while ((ut = SYS.getutxent()) != null) {
45                  if (ut.ut_type == USER_PROCESS || ut.ut_type == LOGIN_PROCESS) {
46                      String user = Native.toString(ut.ut_user, StandardCharsets.US_ASCII);
47                      String device = Native.toString(ut.ut_line, StandardCharsets.US_ASCII);
48                      String host = Native.toString(ut.ut_host, StandardCharsets.US_ASCII);
49                      long loginTime = ut.ut_tv.tv_sec.longValue() * 1000L + ut.ut_tv.tv_usec / 1000L;
50                      // Sanity check. If errors, default to who command line
51                      if (!isSessionValid(user, device, loginTime)) {
52                          return oshi.driver.unix.Who.queryWho();
53                      }
54                      whoList.add(new OSSession(user, device, loginTime, host));
55                  }
56              }
57          } finally {
58              // Close
59              SYS.endutxent();
60          }
61          return whoList;
62      }
63  }