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-rw-r--r--lib/dtas/buffer.rb4
-rw-r--r--lib/dtas/buffer/fiddle_splice.rb3
-rw-r--r--lib/dtas/buffer/read_write.rb3
-rw-r--r--lib/dtas/buffer/splice.rb3
-rw-r--r--lib/dtas/compat_onenine.rb17
-rw-r--r--lib/dtas/edit_client.rb5
-rw-r--r--lib/dtas/fadefx.rb4
-rw-r--r--lib/dtas/mcache.rb17
-rw-r--r--lib/dtas/mlib.rb12
-rw-r--r--lib/dtas/nonblock.rb24
-rw-r--r--lib/dtas/partstats.rb5
-rw-r--r--lib/dtas/pipe.rb5
-rw-r--r--lib/dtas/pipeline.rb5
-rw-r--r--lib/dtas/player.rb25
-rw-r--r--lib/dtas/player/client_handler.rb8
-rw-r--r--lib/dtas/process.rb8
-rw-r--r--lib/dtas/rg_state.rb4
-rw-r--r--lib/dtas/sigevent/fiddle_efd.rb7
-rw-r--r--lib/dtas/sigevent/pipe.rb5
-rw-r--r--lib/dtas/sink.rb3
-rw-r--r--lib/dtas/source/av.rb7
-rw-r--r--lib/dtas/source/av_ff_common.rb45
-rw-r--r--lib/dtas/source/ff.rb8
-rw-r--r--lib/dtas/source/sox.rb11
-rw-r--r--lib/dtas/source/splitfx.rb5
-rw-r--r--lib/dtas/spawn_fix.rb10
-rw-r--r--lib/dtas/splitfx.rb44
-rw-r--r--lib/dtas/state_file.rb4
-rw-r--r--lib/dtas/track.rb2
-rw-r--r--lib/dtas/unix_accepted.rb49
-rw-r--r--lib/dtas/unix_client.rb6
-rw-r--r--lib/dtas/unix_server.rb16
-rw-r--r--lib/dtas/watchable.rb3
-rw-r--r--lib/dtas/watchable/fiddle_ino.rb6
34 files changed, 171 insertions, 212 deletions
diff --git a/lib/dtas/buffer.rb b/lib/dtas/buffer.rb
index 54487c5..0688af9 100644
--- a/lib/dtas/buffer.rb
+++ b/lib/dtas/buffer.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'io/wait'
@@ -45,7 +45,7 @@ class DTAS::Buffer # :nodoc:
 
   def __dst_error(dst, e)
     warn "dropping #{dst.inspect} due to error: #{e.message} (#{e.class})"
-    dst.close unless dst.closed?
+    dst.close
   end
 
   # This will modify targets
diff --git a/lib/dtas/buffer/fiddle_splice.rb b/lib/dtas/buffer/fiddle_splice.rb
index ad007eb..d9232cd 100644
--- a/lib/dtas/buffer/fiddle_splice.rb
+++ b/lib/dtas/buffer/fiddle_splice.rb
@@ -84,7 +84,8 @@ module DTAS::Buffer::FiddleSplice # :nodoc:
       targets # our one and only target blocked on write
     else
       @bytes_xfer += s
-      :wait_readable # we want to read more from @to_io soon
+      # s < limit means targets[0] is full
+      s < limit ? targets : :wait_readable
     end
   rescue Errno::EPIPE, IOError => e
     __dst_error(targets[0], e)
diff --git a/lib/dtas/buffer/read_write.rb b/lib/dtas/buffer/read_write.rb
index fdf820c..8fdb25d 100644
--- a/lib/dtas/buffer/read_write.rb
+++ b/lib/dtas/buffer/read_write.rb
@@ -1,10 +1,9 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'io/nonblock'
 require_relative '../../dtas'
 require_relative '../pipe'
-require_relative '../nonblock'
 
 # compatibility code for non-Linux systems lacking "splice" support.
 # Used only by -player
diff --git a/lib/dtas/buffer/splice.rb b/lib/dtas/buffer/splice.rb
index e5d17ab..b9957ce 100644
--- a/lib/dtas/buffer/splice.rb
+++ b/lib/dtas/buffer/splice.rb
@@ -39,7 +39,8 @@ module DTAS::Buffer::Splice # :nodoc:
       targets # our one and only target blocked on write
     else
       @bytes_xfer += s
-      :wait_readable # we want to read more from @to_io soon
+      # s < limit means targets[0] is full
+      s < limit ? targets : :wait_readable
     end
   rescue Errno::EPIPE, IOError => e
     __dst_error(targets[0], e)
diff --git a/lib/dtas/compat_onenine.rb b/lib/dtas/compat_onenine.rb
deleted file mode 100644
index b65ea50..0000000
--- a/lib/dtas/compat_onenine.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
-# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
-
-# Make Ruby 1.9.3 look like Ruby 2.0.0 to us
-# This exists for Debian wheezy users using the stock Ruby 1.9.3 install.
-# We'll drop this interface when Debian wheezy (7.0) becomes unsupported.
-class String # :nodoc:
-  def b # :nodoc:
-    dup.force_encoding(Encoding::BINARY)
-  end
-end unless String.method_defined?(:b)
-
-def IO # :nodoc:
-  def self.pipe # :nodoc:
-    super.each { |io| io.close_on_exec = true }
-  end
-end if RUBY_VERSION.to_f <= 1.9
diff --git a/lib/dtas/edit_client.rb b/lib/dtas/edit_client.rb
index a885060..2bdc4d8 100644
--- a/lib/dtas/edit_client.rb
+++ b/lib/dtas/edit_client.rb
@@ -1,8 +1,7 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'tempfile'
-require 'yaml'
 require_relative 'unix_client'
 require_relative 'disclaimer'
 
@@ -14,7 +13,7 @@ module DTAS::EditClient # :nodoc:
       v.empty? and next
       return v
     end
-    'vi'.freeze
+    'vi'
   end
 
   def client_socket
diff --git a/lib/dtas/fadefx.rb b/lib/dtas/fadefx.rb
index 7bccff8..0ec108c 100644
--- a/lib/dtas/fadefx.rb
+++ b/lib/dtas/fadefx.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../dtas'
@@ -95,7 +95,7 @@ class DTAS::FadeFX # :nodoc:
   def parse!(str)
     return nil if str.empty?
     type = "t"
-    str.sub!(/\A([a-z])/, "") and type = DTAS.dedupe_str($1)
+    str.sub!(/\A([a-z])/, "") and type = -$1
     F.new(type, parse_time(str))
   end
 end
diff --git a/lib/dtas/mcache.rb b/lib/dtas/mcache.rb
index 817bfb8..e0a39af 100644
--- a/lib/dtas/mcache.rb
+++ b/lib/dtas/mcache.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2016-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 # encoding: binary
@@ -13,16 +13,27 @@ class DTAS::Mcache
 
   def lookup(infile)
     bucket = infile.hash & @mask
+    st = nil
     if cur = @tbl[bucket]
       if cur[:infile] == infile && (DTAS.now - cur[:btime]) < @ttl
-        return cur
+        begin
+          st = File.stat(infile)
+          return cur if cur[:ctime] == st.ctime
+        rescue
+        end
       end
     end
     return unless block_given?
     @tbl[bucket] = begin
       cur = cur ? cur.clear : {}
+      begin
+        st ||= File.stat(infile)
+        cur[:ctime] = st.ctime
+      rescue
+        return
+      end
       if ret = yield(infile, cur)
-        ret[:infile] = infile.frozen? ? infile : infile.dup.freeze
+        ret[:infile] = infile.frozen? ? infile : -(infile.dup)
         ret[:btime] = DTAS.now
       end
       ret
diff --git a/lib/dtas/mlib.rb b/lib/dtas/mlib.rb
index eb7554a..f99ed6a 100644
--- a/lib/dtas/mlib.rb
+++ b/lib/dtas/mlib.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-# Copyright (C) 2015-2021 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 #
@@ -201,9 +201,7 @@ class DTAS::Mlib # :nodoc:
       tag_id = tag_map[x] and tag_map["#{x}number"] = tag_id
     end
     @tag_rmap = tag_map.invert.freeze
-    tag_map.merge!(Hash[*(tag_map.map { |k,v|
-      [DTAS.dedupe_str(k.upcase), v]
-    }.flatten!)])
+    tag_map.merge!(Hash[*(tag_map.map { |k,v| [-(k.upcase), v] }.flatten!)])
     @tag_map = tag_map.freeze
   end
 
@@ -421,7 +419,7 @@ class DTAS::Mlib # :nodoc:
     return '/' if base == '' # root_node
     parent_id = node[:parent_id]
     base += '/' unless node[:tlen] >= 0
-    ppath = cache[parent_id] and return DTAS.dedupe_str("#{ppath}/#{base}")
+    ppath = cache[parent_id] and return -"#{ppath}/#{base}"
     parts = []
     begin
       node = @db[:nodes][id: node[:parent_id]]
@@ -429,9 +427,9 @@ class DTAS::Mlib # :nodoc:
       parts.unshift node[:name]
     end while true
     parts.unshift('')
-    cache[parent_id] = DTAS.dedupe_str(parts.join('/'))
+    cache[parent_id] = -(parts.join('/'))
     parts << base
-    DTAS.dedupe_str(parts.join('/'))
+    -(parts.join('/'))
   end
 
   def emit_recurse(node, cache, cb)
diff --git a/lib/dtas/nonblock.rb b/lib/dtas/nonblock.rb
deleted file mode 100644
index 2cf086c..0000000
--- a/lib/dtas/nonblock.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# Copyright (C) 2015-2020 all contributors <dtas-all@nongnu.org>
-# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
-
-class DTAS::Nonblock < IO # :nodoc:
-  if RUBY_VERSION.to_f <= 2.0
-    EX = {}.freeze
-    def read_nonblock(len, buf = nil, opts = EX)
-      super(len, buf)
-    rescue IO::WaitReadable
-      raise if opts[:exception]
-      :wait_readable
-    rescue EOFError
-      raise if opts[:exception]
-      nil
-    end
-
-    def write_nonblock(buf, opts = EX)
-      super(buf)
-    rescue IO::WaitWritable
-      raise if opts[:exception]
-      :wait_writable
-    end
-  end
-end
diff --git a/lib/dtas/partstats.rb b/lib/dtas/partstats.rb
index 45eff34..061ff50 100644
--- a/lib/dtas/partstats.rb
+++ b/lib/dtas/partstats.rb
@@ -1,5 +1,5 @@
 # -*- encoding: binary -*-
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../dtas'
@@ -11,7 +11,6 @@ require_relative 'sigevent'
 class DTAS::PartStats # :nodoc:
   CMD = 'sox "$INFILE" -n $TRIMFX $SOXFX stats $STATSOPTS'
   include DTAS::Process
-  include DTAS::SpawnFix
   attr_reader :key_idx
   attr_reader :key_width
 
@@ -172,7 +171,7 @@ becomes:
       else
         next
       end
-      key = DTAS.dedupe_str($1)
+      key = -$1
       key_idx = @key_idx[key]
       parts = line.split(/\s+/)
       nshift.times { parts.shift } # remove stuff we don't need
diff --git a/lib/dtas/pipe.rb b/lib/dtas/pipe.rb
index 34d50bd..a7b02b0 100644
--- a/lib/dtas/pipe.rb
+++ b/lib/dtas/pipe.rb
@@ -1,12 +1,11 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../dtas'
 require_relative 'writable_iter'
-require_relative 'nonblock'
 
 # pipe wrapper for -player sinks
-class DTAS::Pipe < DTAS::Nonblock # :nodoc:
+class DTAS::Pipe < IO # :nodoc:
   include DTAS::WritableIter
   attr_accessor :sink
 
diff --git a/lib/dtas/pipeline.rb b/lib/dtas/pipeline.rb
index eb2af89..1bebe87 100644
--- a/lib/dtas/pipeline.rb
+++ b/lib/dtas/pipeline.rb
@@ -1,12 +1,9 @@
-# Copyright (C) 2017-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../dtas'
-require_relative 'spawn_fix'
 
 module DTAS::Pipeline # :nodoc:
-  include DTAS::SpawnFix
-
   # Process.spawn wrapper which supports running Proc-like objects in
   # a separate process, not just external commands.
   # Returns the pid of the spawned process
diff --git a/lib/dtas/player.rb b/lib/dtas/player.rb
index b39a2e7..6ea3aba 100644
--- a/lib/dtas/player.rb
+++ b/lib/dtas/player.rb
@@ -1,8 +1,8 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
-require 'yaml'
 require 'shellwords'
+require 'yaml'
 require_relative '../dtas'
 require_relative 'xs'
 require_relative 'source'
@@ -37,6 +37,7 @@ class DTAS::Player # :nodoc:
     @paused = false
     @format = DTAS::Format.new
     @bypass = [] # %w(rate bits channels) (not worth Hash overhead)
+    @bypass_next = nil # source_spec
 
     @sinks = {} # { user-defined name => sink }
     @targets = [] # order matters
@@ -123,10 +124,6 @@ class DTAS::Player # :nodoc:
     rv
   end
 
-  def to_omap(hash)
-    YAML::Omap === hash ? hash : YAML::Omap.new.merge!(hash)
-  end
-
   def self.load(hash)
     rv = new
     rv.instance_eval do
@@ -157,7 +154,6 @@ class DTAS::Player # :nodoc:
         @source_map.each do |name, src|
           src_hsh = v[name] or next
           src.load!(src_hsh)
-          src.env = to_omap(src.env)
         end
         source_map_reload
       end
@@ -168,9 +164,8 @@ class DTAS::Player # :nodoc:
 
       if sinks = hash["sinks"]
         sinks.each do |sink_hsh|
-          sink_hsh['name'] = DTAS.dedupe_str(sink_hsh['name'])
+          sink_hsh['name'] = -sink_hsh['name']
           sink = DTAS::Sink.load(sink_hsh)
-          sink.env = to_omap(sink.env)
           @sinks[sink.name] = sink
         end
       end
@@ -208,13 +203,13 @@ class DTAS::Player # :nodoc:
     command = msg.shift
     case command
     when "enq"
-      enq_handler(io, msg[0])
+      enq_handler(io, -msg[0])
     when "enq-cmd"
-      enq_handler(io, { "command" => msg[0]})
+      enq_handler(io, { "command" => -msg[0]})
     when "pause", "play", "play_pause"
       play_pause_handler(io, command)
     when "pwd"
-      io.emit(Dir.pwd)
+      io.emit(-Dir.pwd)
     else
       m = "dpc_#{command.tr('-', '_')}"
       __send__(m, io, msg) if respond_to?(m)
@@ -337,6 +332,7 @@ class DTAS::Player # :nodoc:
 
   # called when the player is leaving idle state
   def spawn_sinks(source_spec)
+    @bypass_next = nil
     return true if @targets[0]
     @sinks.each_value do |sink|
       sink.active or next
@@ -398,6 +394,8 @@ class DTAS::Player # :nodoc:
       if ! @bypass.empty? && pending.respond_to?(:format)
         new_fmt = bypass_match!(@format.dup, pending.format)
         if new_fmt != @format
+          @bypass_next = source_spec
+          return if @sink_buf.inflight > 0
           stop_sinks # we may fail to start below
           format_update!(new_fmt)
         end
@@ -440,6 +438,7 @@ class DTAS::Player # :nodoc:
   end
 
   def stop_sinks
+    @bypass_next = nil
     @targets.each { |t| drop_target(t) }.clear
   end
 
@@ -464,7 +463,9 @@ class DTAS::Player # :nodoc:
     end
 
     # nothing left inflight, stop the sinks until we have a source
+    bn = @bypass_next
     stop_sinks
+    next_source(bn) if bn # are we restarting for bypass?
     :ignore
   end
 
diff --git a/lib/dtas/player/client_handler.rb b/lib/dtas/player/client_handler.rb
index cf5442d..3c5fe5d 100644
--- a/lib/dtas/player/client_handler.rb
+++ b/lib/dtas/player/client_handler.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../xs'
@@ -135,7 +135,7 @@ module DTAS::Player::ClientHandler # :nodoc:
       # or variable names.
       sink.valid_name?(name) or return io.emit("ERR sink name invalid")
 
-      sink.name = DTAS.dedupe_str(name)
+      sink.name = -name
       active_before = sink.active
       before = __sink_snapshot(sink)
 
@@ -144,7 +144,7 @@ module DTAS::Player::ClientHandler # :nodoc:
         k, v = kv.split('=', 2)
         case k
         when %r{\Aenv\.([^=]+)\z}
-          sink.env[DTAS.dedupe_str($1)] = v
+          sink.env[$1] = v
         when %r{\Aenv#([^=]+)\z}
           v == nil or return io.emit("ERR unset env has no value")
           sink.env.delete($1)
@@ -564,7 +564,7 @@ module DTAS::Player::ClientHandler # :nodoc:
         rescue => e
           res = "ERR dumping to #{xs(sf.path)} #{e.message}"
         end
-        io.to_io.send(res, Socket::MSG_EOR)
+        io.to_io.send(res, 0)
       ensure
         exit!(0)
       end
diff --git a/lib/dtas/process.rb b/lib/dtas/process.rb
index f93a8c4..02bf77e 100644
--- a/lib/dtas/process.rb
+++ b/lib/dtas/process.rb
@@ -1,17 +1,15 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'io/wait'
 require 'shellwords'
 require_relative '../dtas'
 require_relative 'xs'
-require_relative 'nonblock'
 
 # process management helpers
 module DTAS::Process # :nodoc:
   PIDS = {}
   include DTAS::XS
-  include DTAS::SpawnFix
 
   def self.reaper
     begin
@@ -89,12 +87,12 @@ module DTAS::Process # :nodoc:
       env = {}
     end
     buf = ''.b
-    r, w = DTAS::Nonblock.pipe
+    r, w = IO.pipe
     opts = opts.merge(out: w)
     r.binmode
     no_raise = opts.delete(:no_raise)
     if err_str = opts.delete(:err_str)
-      re, we = DTAS::Nonblock.pipe
+      re, we = IO.pipe
       re.binmode
       opts[:err] = we
     end
diff --git a/lib/dtas/rg_state.rb b/lib/dtas/rg_state.rb
index d463bd8..9a44835 100644
--- a/lib/dtas/rg_state.rb
+++ b/lib/dtas/rg_state.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 #
@@ -72,7 +72,7 @@ class DTAS::RGState # :nodoc:
     when 1 then return 'gain 192'
     else
       val.abs <= 0.00000001 and return
-      DTAS.dedupe_str(sprintf('gain %0.8f', val))
+      -sprintf('gain %0.8f', val)
     end
   end
 
diff --git a/lib/dtas/sigevent/fiddle_efd.rb b/lib/dtas/sigevent/fiddle_efd.rb
index 40cec77..8bfa332 100644
--- a/lib/dtas/sigevent/fiddle_efd.rb
+++ b/lib/dtas/sigevent/fiddle_efd.rb
@@ -1,10 +1,9 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 
 # used in various places for safe wakeups from IO.select via signals
 # This requires a modern GNU/Linux system with eventfd(2) support
-require_relative '../nonblock'
 require 'fiddle'
 class DTAS::Sigevent # :nodoc:
 
@@ -13,12 +12,12 @@ class DTAS::Sigevent # :nodoc:
     Fiddle::TYPE_INT) # fd
 
   attr_reader :to_io
-  ONE = [ 1 ].pack('Q').freeze
+  ONE = -([ 1 ].pack('Q'))
 
   def initialize
     fd = EventFD.call(0, 02000000|00004000) # EFD_CLOEXEC|EFD_NONBLOCK
     raise "eventfd failed: #{Fiddle.last_error}" if fd < 0
-    @to_io = DTAS::Nonblock.for_fd(fd)
+    @to_io = IO.for_fd(fd)
     @buf = ''.b
   end
 
diff --git a/lib/dtas/sigevent/pipe.rb b/lib/dtas/sigevent/pipe.rb
index e6fbbf2..6c3b83c 100644
--- a/lib/dtas/sigevent/pipe.rb
+++ b/lib/dtas/sigevent/pipe.rb
@@ -1,15 +1,14 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 
 # used in various places for safe wakeups from IO.select via signals
 # A fallback for non-Linux systems lacking the "splice" syscall
-require_relative '../nonblock'
 class DTAS::Sigevent # :nodoc:
   attr_reader :to_io
 
   def initialize
-    @to_io, @wr = DTAS::Nonblock.pipe
+    @to_io, @wr = IO.pipe
     @rbuf = ''.b
   end
 
diff --git a/lib/dtas/sink.rb b/lib/dtas/sink.rb
index 735cdef..966bab4 100644
--- a/lib/dtas/sink.rb
+++ b/lib/dtas/sink.rb
@@ -1,7 +1,6 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
-require 'yaml'
 require_relative '../dtas'
 require_relative 'pipe'
 require_relative 'process'
diff --git a/lib/dtas/source/av.rb b/lib/dtas/source/av.rb
index 39cad6c..dcebcfd 100644
--- a/lib/dtas/source/av.rb
+++ b/lib/dtas/source/av.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../../dtas'
@@ -13,13 +13,12 @@ class DTAS::Source::Av # :nodoc:
       'avconv -v error $SSPOS $PROBE -i "$INFILE" $AMAP -f sox - |' \
       'sox -p $SOXFMT - $TRIMFX $RGFX',
 
-    # this is above ffmpeg because this av is the Debian default and
-    # it's easier for me to test av than ff
-    "tryorder" => 1,
+    "tryorder" => 2,
   )
 
   def initialize
     command_init(AV_DEFAULTS)
+    @mcache = nil
     @av_ff_probe = "avprobe"
   end
 
diff --git a/lib/dtas/source/av_ff_common.rb b/lib/dtas/source/av_ff_common.rb
index 6f92762..7f197e0 100644
--- a/lib/dtas/source/av_ff_common.rb
+++ b/lib/dtas/source/av_ff_common.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../../dtas'
@@ -7,10 +7,10 @@ require_relative '../replaygain'
 require_relative '../xs'
 require_relative 'file'
 
-# Common code for libav (avconv/avprobe) and ffmpeg (and ffprobe)
-# TODO: newer versions of both *probes support JSON, which will be easier to
-# parse.  However, the packaged libav version in Debian 7.0 does not
-# support JSON, so we have an ugly parser...
+# Common code for ffmpeg/ffprobe and the abandoned libav (avconv/avprobe).
+# TODO: newer versions of both *probes support JSON, which will be easier
+# to parse.  libav is abandoned, nowadays, and Debian only packages
+# ffmpeg+ffprobe nowadays.
 module DTAS::Source::AvFfCommon # :nodoc:
   include DTAS::Source::File
   include DTAS::XS
@@ -21,10 +21,23 @@ module DTAS::Source::AvFfCommon # :nodoc:
   attr_reader :format
   attr_reader :duration
 
+  CACHE_KEYS = [ :@duration, :@probe_harder, :@comments, :@astreams,
+                 :@format ].freeze
+
+  def mcache_lookup(infile)
+    (@mcache ||= DTAS::Mcache.new).lookup(infile) do |input, dst|
+      tmp = source_file_dup(infile, nil, nil)
+      tmp.av_ff_ok? or return nil
+      CACHE_KEYS.each { |k| dst[k] = tmp.instance_variable_get(k) }
+      dst
+    end
+  end
+
   def try(infile, offset = nil, trim = nil)
-    rv = source_file_dup(infile, offset, trim)
-    rv.av_ff_ok? or return
-    rv
+    ent = mcache_lookup(infile) or return
+    ret = source_file_dup(infile, offset, trim)
+    CACHE_KEYS.each { |k| ret.instance_variable_set(k, ent[k]) }
+    ret
   end
 
   def __parse_astream(cmd, stream)
@@ -79,7 +92,7 @@ module DTAS::Source::AvFfCommon # :nodoc:
 
       err = "".b
       begin
-        s = qx(@env, cmd, err_str: err, no_raise: true)
+        s = qx(@env, cmd, err_str: err, no_raise: true, rlimit_cpu: [ 1, 2 ])
       rescue Errno::ENOENT # avprobe/ffprobe not installed
         return false
       end
@@ -104,13 +117,14 @@ module DTAS::Source::AvFfCommon # :nodoc:
       prev_cmd = cmd
     end while incomplete.compact[0]
 
+    enc = Encoding.default_external # typically Encoding::UTF_8
     # old avprobe
     s.scan(%r{^\[FORMAT\]\n(.*?)\n\[/FORMAT\]\n}m) do |_|
       f = $1.dup
       f =~ /^duration=([\d\.]+)\s*$/nm and @duration = $1.to_f
       # TODO: multi-line/multi-value/repeated tags
       f.gsub!(/^TAG:([^=]+)=(.*)$/ni) { |_|
-        @comments[DTAS.dedupe_str($1.upcase)] = DTAS.dedupe_str($2)
+        @comments[-DTAS.try_enc($1.upcase, enc)] = $2
       }
     end
 
@@ -118,13 +132,22 @@ module DTAS::Source::AvFfCommon # :nodoc:
     s.scan(%r{^\[format\.tags\]\n(.*?)\n\n}m) do |_|
       f = $1.dup
       f.gsub!(/^([^=]+)=(.*)$/ni) { |_|
-        @comments[DTAS.dedupe_str($1.upcase)] = DTAS.dedupe_str($2)
+        @comments[-DTAS.try_enc($1.upcase, enc)] = $2
       }
     end
     s.scan(%r{^\[format\]\n(.*?)\n\n}m) do |_|
       f = $1.dup
       f =~ /^duration=([\d\.]+)\s*$/nm and @duration = $1.to_f
     end
+    comments.each do |k,v|
+      v.chomp!
+      comments[k] = -DTAS.try_enc(v, enc)
+    end
+
+    # ffprobe always uses "track", favor FLAC convention "TRACKNUMBER":
+    if @comments['TRACK'] && !@comments['TRACKNUMBER']
+      @comments['TRACKNUMBER'] = @comments.delete('TRACK')
+    end
 
     ! @astreams.compact.empty?
   end
diff --git a/lib/dtas/source/ff.rb b/lib/dtas/source/ff.rb
index 687cd18..c337b42 100644
--- a/lib/dtas/source/ff.rb
+++ b/lib/dtas/source/ff.rb
@@ -1,12 +1,10 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../../dtas'
 require_relative 'av_ff_common'
 
 # ffmpeg support
-# note: only tested with the compatibility wrapper in the Debian 7.0 package
-# (so still using avconv/avprobe)
 class DTAS::Source::Ff  # :nodoc:
   include DTAS::Source::AvFfCommon
 
@@ -15,12 +13,12 @@ class DTAS::Source::Ff  # :nodoc:
       'ffmpeg -v error $SSPOS $PROBE -i "$INFILE" $AMAP -f sox - |' \
       'sox -p $SOXFMT - $TRIMFX $RGFX',
 
-    # I haven't tested this much since av is in Debian stable and ff is not
-    "tryorder" => 2,
+    "tryorder" => 1,
   )
 
   def initialize
     command_init(FF_DEFAULTS)
+    @mcache = nil
     @av_ff_probe = "ffprobe"
   end
 
diff --git a/lib/dtas/source/sox.rb b/lib/dtas/source/sox.rb
index 3a7fe7d..365c7b6 100644
--- a/lib/dtas/source/sox.rb
+++ b/lib/dtas/source/sox.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 # encoding: binary
@@ -24,7 +24,7 @@ class DTAS::Source::Sox # :nodoc:
     return if @last_failed == infile
     @last_failed = infile
     case msg
-    when Process::Status then msg = "failed with #{msg.exitstatus}"
+    when Process::Status then msg = "failed with #{msg.inspect}"
     when 0 then msg = 'detected zero samples'
     end
     warn("soxi #{infile}: #{msg}\n")
@@ -39,7 +39,8 @@ class DTAS::Source::Sox # :nodoc:
   def mcache_lookup(infile)
     (@mcache ||= DTAS::Mcache.new).lookup(infile) do |input, dst|
       err = ''.b
-      out = qx(@env.dup, %W(soxi #{input}), err_str: err, no_raise: true)
+      out = qx(@env.dup, %W(soxi #{input}), err_str: err, no_raise: true,
+                rlimit_cpu: [ 1, 2 ])
       return soxi_failed(infile, out) if Process::Status === out
       return soxi_failed(infile, err) if err =~ /soxi FAIL formats:/
       out =~ /^Duration\s*:[^=]*= (\d+) samples /n
@@ -56,14 +57,14 @@ class DTAS::Source::Sox # :nodoc:
         key = nil
         $1.split(/\n/n).each do |line|
           if line.sub!(/^([^=]+)=/ni, '')
-            key = DTAS.dedupe_str(DTAS.try_enc($1.upcase, enc))
+            key = DTAS.try_enc($1.upcase, enc)
           end
           (comments[key] ||= ''.b) << "#{line}\n" unless line.empty?
         end
         comments.each do |k,v|
           v.chomp!
           DTAS.try_enc(v, enc)
-          comments[k] = DTAS.dedupe_str(v)
+          comments[k] = -v
         end
       end
       dst
diff --git a/lib/dtas/source/splitfx.rb b/lib/dtas/source/splitfx.rb
index 11e4190..2268404 100644
--- a/lib/dtas/source/splitfx.rb
+++ b/lib/dtas/source/splitfx.rb
@@ -1,7 +1,6 @@
-# Copyright (C) 2014-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
-require 'yaml'
 require_relative 'sox'
 require_relative '../splitfx'
 require_relative '../watchable'
@@ -36,7 +35,7 @@ class DTAS::Source::SplitFX < DTAS::Source::Sox # :nodoc:
 
     sfx = DTAS::SplitFX.new
     Dir.chdir(File.dirname(ymlfile)) do # ugh
-      @ymlhash = YAML.load(buf)
+      @ymlhash = DTAS.yaml_load(buf)
       @ymlhash['tracks'] ||= [ "t 0 default" ]
       sfx.import(@ymlhash)
       sfx.infile.replace(File.expand_path(sfx.infile))
diff --git a/lib/dtas/spawn_fix.rb b/lib/dtas/spawn_fix.rb
deleted file mode 100644
index b586130..0000000
--- a/lib/dtas/spawn_fix.rb
+++ /dev/null
@@ -1,10 +0,0 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
-# License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
-# workaround for older Rubies: https://bugs.ruby-lang.org/issues/8770
-module DTAS::SpawnFix # :nodoc:
-  def spawn(*args)
-    super(*args)
-  rescue Errno::EINTR
-    retry
-  end if RUBY_VERSION.to_f <= 2.1
-end
diff --git a/lib/dtas/splitfx.rb b/lib/dtas/splitfx.rb
index 9e1cfd0..b94f54b 100644
--- a/lib/dtas/splitfx.rb
+++ b/lib/dtas/splitfx.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../dtas'
@@ -10,7 +10,8 @@ require 'tempfile'
 # Unlike the stuff for dtas-player, dtas-splitfx is fairly tied to sox
 # (but we may still pipe to ecasound or anything else)
 class DTAS::SplitFX # :nodoc:
-  CMD = 'sox "$INFILE" $COMMENTS $OUTFMT $OUTDST $TRIMFX $FX $RATEFX $DITHERFX'
+  CMD = 'sox "$INFILE" $COMMENTS $OUTFMT $OUTDST $TRIMFX $FX' \
+        ' $RATEFX $DITHERFX $STATS'
   include DTAS::Process
   attr_reader :infile, :env, :command
 
@@ -65,6 +66,7 @@ class DTAS::SplitFX # :nodoc:
   # $CHANNELS (input)
   # $BITS_PER_SAMPLE (input)
   def initialize
+    @tshift = 0
     @env = {}
     @comments = {}
     @track_start = 1
@@ -113,7 +115,7 @@ class DTAS::SplitFX # :nodoc:
     end
 
     case v = hash["track_zpad"]
-    when Integer then @track_zpad = val
+    when Integer then @track_zpad = v
     else
       _bool(hash, "track_zpad") { |val| @track_zpad = val }
     end
@@ -204,6 +206,7 @@ class DTAS::SplitFX # :nodoc:
     elsif outfmt.bits && outfmt.bits <= 16
       env["DITHERFX"] = "dither -s"
     end
+    env['STATS'] = 'stats' if opts[:stats]
     comments = Tempfile.new(%W(dtas-splitfx-#{t.comments["TRACKNUMBER"]} .txt))
     t.comments.each do |k,v|
       env[k] = v.to_s
@@ -288,8 +291,9 @@ class DTAS::SplitFX # :nodoc:
       start_time = argv.shift
       title = argv.shift
       t = T.new
-      t.tbeg = @t2s.call(start_time)
+      t.tbeg = @t2s.call(start_time) + @tshift
       t.comments = @comments.dup
+      title.valid_encoding? or warn "#{title.inspect} encoding invalid"
       t.comments["TITLE"] = title
       t.env = @env.dup
 
@@ -299,6 +303,7 @@ class DTAS::SplitFX # :nodoc:
           t.fade_in = $1.split(/\s+/)
         when %r{\Afade_out=(.+)\z} # $1 = "t 4" or just "4"
           t.fade_out = $1.split(/\s+/)
+        when %r{\Aenv\.([^=]+)=(.+)\z} then t.env[$1] = -$2
         when %r{\A\.(\w+)=(.+)\z} then t.comments[$1] = $2
         else
           raise ArgumentError, "unrecognized arg(s): #{xs(argv)}"
@@ -307,11 +312,24 @@ class DTAS::SplitFX # :nodoc:
 
       prev = @tracks.last and prev.commit(t.tbeg)
       @tracks << t
+    when 'tshift'
+      tshift = argv.shift
+      argv.empty? or raise ArgumentError, 'tshift does not take extra args'
+      if tshift.sub!(/\A-=/, '')
+        @tshift = @tshift - @t2s.call(tshift)
+      elsif tshift.sub!(/\A\+=/, '')
+        @tshift = @tshift + @t2s.call(tshift)
+      elsif tshift.sub!(/\A-/, '')
+        @tshift = -@t2s.call(tshift)
+      else
+        tshift.sub!(/\A\+/, '')
+        @tshift = @t2s.call(tshift)
+      end
     when "skip"
       stop_time = argv.shift
       argv.empty? or raise ArgumentError, "skip does not take extra args"
       s = Skip.new
-      s.tbeg = @t2s.call(stop_time)
+      s.tbeg = @t2s.call(stop_time) + @tshift
       # s.comments = {}
       # s.env = {}
       prev = @tracks.last or raise ArgumentError, "no tracks to skip"
@@ -320,7 +338,7 @@ class DTAS::SplitFX # :nodoc:
     when "stop"
       stop_time = argv.shift
       argv.empty? or raise ArgumentError, "stop does not take extra args"
-      samples = @t2s.call(stop_time)
+      samples = @t2s.call(stop_time) + @tshift
       prev = @tracks.last and prev.commit(samples)
     else
       raise ArgumentError, "unknown command: #{xs(cmd)}"
@@ -356,9 +374,19 @@ class DTAS::SplitFX # :nodoc:
     @rate = opts[:rate]
     @bits = opts[:bits]
     trim = opts[:trim] and @tracks = [ UTrim.new(trim, @env, @comments) ]
-
+    if trim && opts[:filter]
+      raise ArgumentError, 'trim and filter are mutually exclusive'
+    end
     fails = []
     tracks = @tracks.dup
+    (opts[:filter] || []).each do |re|
+      field, val = re.split(/=/, 2)
+      if val
+        tracks.delete_if { |t| (t.comments[field] || '') !~ /#{val}/ }
+      else
+        tracks.delete_if { |t| t.comments.values.grep(/#{re}/).empty? }
+      end
+    end
     pids = {}
     jobs = opts[:jobs] || tracks.size # jobs == nil => everything at once
     if opts[:sox_pipe]
@@ -384,7 +412,7 @@ class DTAS::SplitFX # :nodoc:
         @out.puts "DONE #{done[0].inspect}" if $DEBUG
         done[1].close!
       else
-        fails << [ t, status ]
+        fails << [ done[0], status ]
       end
     end
 
diff --git a/lib/dtas/state_file.rb b/lib/dtas/state_file.rb
index eac3e2f..f16a866 100644
--- a/lib/dtas/state_file.rb
+++ b/lib/dtas/state_file.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'yaml'
@@ -14,7 +14,7 @@ class DTAS::StateFile # :nodoc:
   end
 
   def tryload
-    YAML.load(IO.binread(@path)) if File.readable?(@path)
+    DTAS.yaml_load(IO.binread(@path)) if File.readable?(@path)
   end
 
   def dump(obj, force_fsync = false)
diff --git a/lib/dtas/track.rb b/lib/dtas/track.rb
index 85b667a..3f4b813 100644
--- a/lib/dtas/track.rb
+++ b/lib/dtas/track.rb
@@ -9,6 +9,6 @@ class DTAS::Track # :nodoc:
 
   def initialize(track_id, path)
     @track_id = track_id
-    @to_path = path
+    @to_path = -path
   end
 end
diff --git a/lib/dtas/unix_accepted.rb b/lib/dtas/unix_accepted.rb
index ec7f3ef..63d3ce0 100644
--- a/lib/dtas/unix_accepted.rb
+++ b/lib/dtas/unix_accepted.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'socket'
@@ -10,23 +10,22 @@ class DTAS::UNIXAccepted # :nodoc:
 
   def initialize(sock)
     @to_io = sock
-    @send_buf = []
+    @sbuf = []
   end
 
   # public API (for DTAS::Player)
   # returns :wait_readable on success
   def emit(msg)
-    buffered = @send_buf.size
-    if buffered == 0
-      case rv = sendmsg_nonblock(msg)
+    if @sbuf.empty?
+      case rv = @to_io.sendmsg_nonblock(msg, 0, exception: false)
       when :wait_writable
-        @send_buf << msg
+        @sbuf << msg
         rv
       else
         :wait_readable
       end
-    else # buffered > 0
-      @send_buf << msg
+    else
+      @sbuf << msg
       :wait_writable
     end
   rescue => e
@@ -35,11 +34,11 @@ class DTAS::UNIXAccepted # :nodoc:
 
   # flushes pending data if it got buffered
   def writable_iter
-    case sendmsg_nonblock(@send_buf[0])
+    case @to_io.sendmsg_nonblock(@sbuf[0], 0, exception: false)
     when :wait_writable then return :wait_writable
     else
-      @send_buf.shift
-      @send_buf.empty? ? :wait_readable : :wait_writable
+      @sbuf.shift
+      @sbuf.empty? ? :wait_readable : :wait_writable
     end
   rescue => e
     e
@@ -51,13 +50,13 @@ class DTAS::UNIXAccepted # :nodoc:
     # EOF, assume no spurious wakeups for SOCK_SEQPACKET
     return nil if nread == 0
 
-    case msg = recv_nonblock(nread)
+    case msg = @to_io.recv_nonblock(nread, exception: false)
     when :wait_readable then return msg
     when '', nil then return nil # EOF
     else
       yield(self, msg) # DTAS::Player deals with this
     end
-    @send_buf.empty? ? :wait_readable : :wait_writable
+    @sbuf.empty? ? :wait_readable : :wait_writable
   rescue SystemCallError
     nil
   end
@@ -69,28 +68,4 @@ class DTAS::UNIXAccepted # :nodoc:
   def closed?
     @to_io.closed?
   end
-
-  if RUBY_VERSION.to_f >= 2.3
-    def sendmsg_nonblock(msg)
-      @to_io.sendmsg_nonblock(msg, Socket::MSG_EOR, exception: false)
-    end
-
-    def recv_nonblock(len)
-      @to_io.recv_nonblock(len, exception: false)
-    end
-  else
-    def sendmsg_nonblock(msg)
-      @to_io.sendmsg_nonblock(msg, Socket::MSG_EOR)
-    rescue IO::WaitWritable
-      :wait_writable
-    end
-
-    def recv_nonblock(len)
-      @to_io.recv_nonblock(len)
-    rescue IO::WaitReadable
-      :wait_readable
-    rescue EOFError
-      nil
-    end
-  end
 end
diff --git a/lib/dtas/unix_client.rb b/lib/dtas/unix_client.rb
index 8aa953c..8c73b7d 100644
--- a/lib/dtas/unix_client.rb
+++ b/lib/dtas/unix_client.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../dtas'
@@ -24,7 +24,7 @@ class DTAS::UNIXClient # :nodoc:
 
   def req_start(args)
     args = xs(args) if Array === args
-    @to_io.send(args, Socket::MSG_EOR)
+    @to_io.send(args, 0)
   end
 
   def req_ok(args, timeout = nil)
@@ -39,7 +39,7 @@ class DTAS::UNIXClient # :nodoc:
   end
 
   def res_wait(timeout = nil)
-    IO.select([@to_io], nil, nil, timeout)
+    @to_io.wait_readable(timeout)
     nr = @to_io.nread
     nr > 0 or raise EOFError, "unexpected EOF from server"
     @to_io.recv(nr)
diff --git a/lib/dtas/unix_server.rb b/lib/dtas/unix_server.rb
index cad3fc4..60ab86c 100644
--- a/lib/dtas/unix_server.rb
+++ b/lib/dtas/unix_server.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'socket'
@@ -59,7 +59,7 @@ class DTAS::UNIXServer # :nodoc:
 
   def readable_iter
     # we do not do anything with the block passed to us
-    case rv = accept_nonblock
+    case rv = @to_io.accept_nonblock(exception: false)
     when :wait_readable then return rv
     else
       @readers[DTAS::UNIXAccepted.new(rv[0])] = true
@@ -114,16 +114,4 @@ class DTAS::UNIXServer # :nodoc:
       wait_ctl(io, io.readable_iter { |_io, msg| yield(_io, msg) })
     end
   end
-
-  if RUBY_VERSION.to_f >= 2.3
-    def accept_nonblock
-      @to_io.accept_nonblock(exception: false)
-    end
-  else
-    def accept_nonblock
-      @to_io.accept_nonblock
-    rescue Errno::EAGAIN, Errno::ECONNABORTED, Errno::EPROTO
-      :wait_readable
-    end
-  end
 end
diff --git a/lib/dtas/watchable.rb b/lib/dtas/watchable.rb
index 6168bf3..445bf98 100644
--- a/lib/dtas/watchable.rb
+++ b/lib/dtas/watchable.rb
@@ -1,8 +1,7 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require_relative '../dtas'
-require_relative 'nonblock'
 begin
   module DTAS::Watchable # :nodoc:
     module InotifyCommon # :nodoc:
diff --git a/lib/dtas/watchable/fiddle_ino.rb b/lib/dtas/watchable/fiddle_ino.rb
index e85fea1..3ec72a1 100644
--- a/lib/dtas/watchable/fiddle_ino.rb
+++ b/lib/dtas/watchable/fiddle_ino.rb
@@ -1,4 +1,4 @@
-# Copyright (C) 2013-2020 all contributors <dtas-all@nongnu.org>
+# Copyright (C) all contributors <dtas-all@nongnu.org>
 # License: GPL-3.0+ <https://www.gnu.org/licenses/gpl-3.0.txt>
 # frozen_string_literal: true
 require 'fiddle'
@@ -22,7 +22,7 @@ class DTAS::Watchable::InotifyReadableIter # :nodoc:
   def initialize # :nodoc:
     fd = Inotify_init.call(02000000 | 04000) # CLOEXEC | NONBLOCK
     raise "inotify_init failed: #{Fiddle.last_error}" if fd < 0
-    @to_io = DTAS::Nonblock.for_fd(fd)
+    @to_io = IO.for_fd(fd)
     @buf = ''.b
     @q = []
   end
@@ -53,7 +53,7 @@ class DTAS::Watchable::InotifyReadableIter # :nodoc:
           name.size == len or raise "short name #{name.inspect} != #{len}"
           name.sub!(/\0+\z/, '') or
             raise "missing: `\\0', inotify_event.name=#{name.inspect}"
-          name = DTAS.dedupe_str(name)
+          name = -name
         end
         ie = InotifyEvent.new(wd, mask, cookie, len, name)
         if event