Change socket prefix/suffix to session name

lib/debug/config.rb

@@ -44,10 +44,9 @@ module DEBUGGER__
     open:           ['RUBY_DEBUG_OPEN',         "REMOTE: Open remote port (same as `rdbg --open` option)"],
     port:           ['RUBY_DEBUG_PORT',         "REMOTE: TCP/IP remote debugging: port"],
     host:           ['RUBY_DEBUG_HOST',         "REMOTE: TCP/IP remote debugging: host", :string, "127.0.0.1"],
+    session_name:   ['RUBY_DEBUG_SESSION_NAME'  "REMOTE: Session name for differentiating multiple sessions"],
     sock_path:      ['RUBY_DEBUG_SOCK_PATH',    "REMOTE: UNIX Domain Socket remote debugging: socket path"],
     sock_dir:       ['RUBY_DEBUG_SOCK_DIR',     "REMOTE: UNIX Domain Socket remote debugging: socket directory"],
-    sock_suffix:    ['RUBY_DEBUG_SOCK_SUFFIX',  "REMOTE: UNIX Domain Socket remote debugging: socket suffix"],
-    sock_prefix:    ['RUBY_DEBUG_SOCK_PREFIX',  "REMOTE: UNIX Domain Socket remote debugging: socket prefix"],
     local_fs_map:   ['RUBY_DEBUG_LOCAL_FS_MAP', "REMOTE: Specify local fs map", :path_map],
     skip_bp:        ['RUBY_DEBUG_SKIP_BP',      "REMOTE: Skip breakpoints if no clients are attached", :bool, 'false'],
     cookie:         ['RUBY_DEBUG_COOKIE',       "REMOTE: Cookie for negotiation"],
@@ -499,12 +498,6 @@ def self.unix_domain_socket_dir
   def self.create_unix_domain_socket_name_prefix(base_dir = unix_domain_socket_dir)
     user = ENV['USER'] || 'UnknownUser'
     filename = "ruby-debug-#{user}"
-    if !CONFIG[:sock_prefix].nil?
-      filename = "#{CONFIG[:sock_prefix]}-#{filename}"
-    end
-    if !CONFIG[:sock_suffix].nil?
-      filename += "-#{CONFIG[:sock_suffix]}"
-    end
     File.join(base_dir, filename)
   end