docs: def _handle_sigusr1(sig, stack):
      '''
      Signal handler for SIGUSR1, only available on Unix-like systems
      '''
      # When running in the foreground, do the right  thing
      # and spit out the debug info straight to the console
      if sys.stderr.isatty():
          output = sys.stderr
          _makepretty(output, stack)
      else:
          filename = 'salt-debug-{0}.log'.format(int(time.time()))
          destfile = os.path.join(tempfile.gettempdir(), filename)
          with salt.utils.files.fopen(destfile, 'w') as output:
              _makepretty(output, stack)