unix: show zero-value stats for idle listeners

When unix_listener_stats is called without arguments, it should
still match the behavior of tcp_listener_stats and return
ListenerStats object with zero values.

This allows callers to iterate through the results to find the
pathnames of all the Unix domain sockets in in listen mode.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/test_linux.rb b/test/test_linux.rb
index a84eecf..0e79a86 100644
--- a/test/test_linux.rb
+++ b/test/test_linux.rb
@@ -67,6 +67,17 @@ class TestLinux < Test::Unit::TestCase
     assert_equal 1, stats[tmp.path].queued
   end
 
+  def test_unix_all_unused
+    tmp = Tempfile.new("\xde\xad\xbe\xef") # valid path, really :)
+    File.unlink(tmp.path)
+    us = UNIXServer.new(tmp.path)
+    stats = unix_listener_stats
+    assert stats.keys.include?(tmp.path), stats.inspect
+
+    assert_equal 0, stats[tmp.path].active
+    assert_equal 0, stats[tmp.path].queued
+  end
+
   def test_unix_resolves_symlinks
     tmp = Tempfile.new("\xde\xad\xbe\xef") # valid path, really :)
     File.unlink(tmp.path)