kill off remaining kgio uses

kgio is an extra download and shared object which costs users
bandwidth, disk space, startup time and memory.  Ruby 2.3+
provides `Socket#accept_nonblock(exception: false)' support
in addition to `exception: false' support in IO#*_nonblock
methods from Ruby 2.1.

We no longer distinguish between TCPServer and UNIXServer as
separate classes internally; instead favoring the `Socket' class
of Ruby for both.  This allows us to use `Socket#accept_nonblock'
and get a populated `Addrinfo' object off accept4(2)/accept(2)
without resorting to a getpeername(2) syscall (kgio avoided
getpeername(2) in the same way).

The downside is there's more Ruby-level argument passing and
stack usage on our end with HttpRequest#read_headers (formerly
HttpRequest#read).  I chose this tradeoff since advancements in
Ruby itself can theoretically mitigate the cost of argument
passing, while syscalls are a high fixed cost given modern CPU
vulnerability mitigations.

Note: no benchmarks have been run since I don't have a suitable
system.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/unicorn/oob_gc.rb b/lib/unicorn/oob_gc.rb
index 91a8e51..db9f2cb 100644
--- a/lib/unicorn/oob_gc.rb
+++ b/lib/unicorn/oob_gc.rb
@@ -65,8 +65,8 @@ module Unicorn::OobGC
   end
 
   #:stopdoc:
-  def process_client(client)
-    super(client) # Unicorn::HttpServer#process_client
+  def process_client(*args)
+    super(*args) # Unicorn::HttpServer#process_client
     env = instance_variable_get(:@request).env
     if OOBGC_PATH =~ env['PATH_INFO'] && ((@@nr -= 1) <= 0)
       @@nr = OOBGC_INTERVAL