Add bin and edit workflow

bin/gems/ffi-1.17.1-x86_64-linux-gnu/samples/gettimeofday.rb

@@ -0,0 +1,18 @@
+require 'ffi'
+require 'rbconfig'
+
+class Timeval < FFI::Struct
+  layout tv_sec: :ulong, tv_usec: :ulong
+end
+module LibC
+  extend FFI::Library
+  if FFI::Platform.windows?
+    ffi_lib RbConfig::CONFIG["LIBRUBY_SO"]
+  else
+    ffi_lib FFI::Library::LIBC
+  end
+  attach_function :gettimeofday, [ :pointer, :pointer ], :int
+end
+t = Timeval.new
+LibC.gettimeofday(t.pointer, nil)
+puts "t.tv_sec=#{t[:tv_sec]} t.tv_usec=#{t[:tv_usec]}"