docs: def getFcpDevices(rh):
      """
      Lists the FCP device channels that are active, free, or offline.
  
      Input:
         Request Handle with the following properties:
            function    - 'GETHOST'
            subfunction - 'FCPDEVICES'
  
      Output:
         Request Handle updated with the results.
         Return code - 0: ok, non-zero: error
      """
  
      rh.printSysLog("Enter getHost.getFcpDevices")
  
      parms = ["-T", "dummy"]
      results = invokeSMCLI(rh, "System_WWPN_Query", parms)
      if results['overallRC'] == 0:
          rh.printLn("N", results['response'])
      else:
          # SMAPI API failed.
          rh.printLn("ES", results['response'])
          rh.updateResults(results)    # Use results from invokeSMCLI
  
      rh.printSysLog("Exit getHost.getFcpDevices, rc: " +
          str(rh.results['overallRC']))
      return rh.results['overallRC']