public String getWorkingDirectory() {
      return workingDirectory != null ? workingDirectory : DEFAULT_WORKING_DIRECTORY;
    }
Gets the directory in which the GemFire service is running. This is also the location where
all GemFire service files (log files, the PID file, and so on) are written.

@return a String value indicating the GemFire service's working (running) directory.
geode-core/src/main/java/org/apache/geode/distributed/AbstractLauncher.java