clarify errors when listeners fail to bind

When using multiple listeners, the log messages can be
potentially misleading as to which listener fails to bind:

Before:

  INFO -- : unlinking existing socket=/tmp/unicorn.sock
  INFO -- : listening on addr=/tmp/unicorn.sock fd=3
  unicorn/socket_helper.rb:110:in `initialize': Permission denied - bind(2) (Errno::EACCES)

After:

  INFO -- : unlinking existing socket=/tmp/openxdms.sock
  INFO -- : listening on addr=/tmp/openxdms.sock fd=3
  FATAL -- : error adding listener addr=0.0.0.0:84
  unicorn/socket_helper.rb:110:in `initialize': Permission denied - bind(2) (Errno::EACCES)

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/unicorn.rb b/lib/unicorn.rb
index 114ef9d..69ecf33 100644
--- a/lib/unicorn.rb
+++ b/lib/unicorn.rb
@@ -307,6 +307,9 @@ module Unicorn
                      "(#{tries < 0 ? 'infinite' : tries} tries left)"
         sleep(delay)
         retry
+      rescue => err
+        logger.fatal "error adding listener addr=#{address}"
+        raise err
       end
     end