/*
    * Copyright 2021-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.util.platform.unix.openbsd;
   
   import java.util.List;
   
   import oshi.annotation.concurrent.ThreadSafe;
  import oshi.util.ExecutingCommand;
  import oshi.util.ParseUtil;
  
  /**
   * Reads from fstat.
   */
  @ThreadSafe
  public final class FstatUtil {
      private FstatUtil() {
      }
  
      /**
       * Gets current working directory info (using {@code ps} actually).
       *
       * @param pid a process ID
       * @return the current working directory for that process.
       */
      public static String getCwd(int pid) {
          List<String> ps = ExecutingCommand.runNative("ps -axwwo cwd -p " + pid);
          if (ps.size() > 1) {
              return ps.get(1);
          }
          return "";
      }
  
      /**
       * Gets open number of files.
       *
       * @param pid The process ID
       * @return the number of open files.
       */
      public static long getOpenFiles(int pid) {
          long fd = 0L;
          List<String> fstat = ExecutingCommand.runNative("fstat -sp " + pid);
          for (String line : fstat) {
              String[] split = ParseUtil.whitespaces.split(line.trim(), 11);
              if (split.length == 11 && !"pipe".contains(split[4]) && !"unix".contains(split[4])) {
                  fd++;
              }
          }
          // subtract 1 for header row
          return fd - 1;
      }
  }