diff --git a/lib/fluent/plugin/in_exec.rb b/lib/fluent/plugin/in_exec.rb
index f7728ab..b62025c 100644
--- a/lib/fluent/plugin/in_exec.rb
+++ b/lib/fluent/plugin/in_exec.rb
@@ -1,24 +1,122 @@
 #
-# Copyright 2024- Daijiro Fukuda
+# Fluentd
 #
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
 #
-#     http://www.apache.org/licenses/LICENSE-2.0
+#        http://www.apache.org/licenses/LICENSE-2.0
 #
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-require "fluent/plugin/input"
-
-module Fluent
-  module Plugin
-    class ExecInput < Fluent::Plugin::Input
-      Fluent::Plugin.register_input("exec", self)
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+#
+
+require 'fluent/plugin/input'
+require 'yajl'
+
+module Fluent::Plugin
+  class ExecInput < Fluent::Plugin::Input
+    Fluent::Plugin.register_input('exec', self)
+
+    helpers :compat_parameters, :extract, :parser, :child_process
+
+    desc 'The command (program) to execute.'
+    config_param :command, :string
+    desc 'Specify connect mode to executed process'
+    config_param :connect_mode, :enum, list: [:read, :read_with_stderr], default: :read
+
+    config_section :parse do
+      config_set_default :@type, 'tsv'
+      config_set_default :time_type, :float
+      config_set_default :time_key, nil
+      config_set_default :estimate_current_event, false
+    end
+
+    config_section :extract do
+      config_set_default :time_type, :float
+    end
+
+    desc 'Tag of the output events.'
+    config_param :tag, :string, default: nil
+    desc 'The interval time between periodic program runs.'
+    config_param :run_interval, :time, default: nil
+    desc 'The default block size to read if parser requires partial read.'
+    config_param :read_block_size, :size, default: 10240 # 10k
+    desc 'The encoding to receive the result of the command, especially for non-ascii characters.'
+    config_param :encoding, :string, default: nil
+
+    attr_reader :parser
+
+    def configure(conf)
+      compat_parameters_convert(conf, :extract, :parser)
+      ['parse', 'extract'].each do |subsection_name|
+        if subsection = conf.elements(subsection_name).first
+          if subsection.has_key?('time_format')
+            subsection['time_type'] ||= 'string'
+          end
+        end
+      end
+
+      super
+
+      if !@tag && (!@extract_config || !@extract_config.tag_key)
+        raise Fluent::ConfigError, "'tag' or 'tag_key' option is required on exec input"
+      end
+      validate_encoding(@encoding) if @encoding
+      @parser = parser_create
+    end
+
+    def validate_encoding(encoding)
+      Encoding.find(encoding)
+    rescue ArgumentError => e
+      raise Fluent::ConfigError, e.message
+    end
+
+    def multi_workers_ready?
+      true
+    end
+
+    def start
+      super
+
+      options = { mode: [@connect_mode] }
+      options[:external_encoding] = @encoding if @encoding
+
+      if @run_interval
+        child_process_execute(:exec_input, @command, interval: @run_interval, **options, &method(:run))
+      else
+        child_process_execute(:exec_input, @command, immediate: true, **options, &method(:run))
+      end
+    end
+
+    def run(io)
+      case
+      when @parser.implement?(:parse_io)
+        @parser.parse_io(io, &method(:on_record))
+      when @parser.implement?(:parse_partial_data)
+        until io.eof?
+          @parser.parse_partial_data(io.readpartial(@read_block_size), &method(:on_record))
+        end
+      when @parser.parser_type == :text_per_line
+        io.each_line do |line|
+          @parser.parse(line.chomp, &method(:on_record))
+        end
+      else
+        @parser.parse(io.read, &method(:on_record))
+      end
+    end
+
+    def on_record(time, record)
+      tag = extract_tag_from_record(record)
+      tag ||= @tag
+      time ||= extract_time_from_record(record) || Fluent::EventTime.now
+      router.emit(tag, time, record)
+    rescue => e
+      log.error "exec failed to emit", tag: tag, record: Yajl.dump(record), error: e
+      router.emit_error_event(tag, time, record, e) if tag && time && record
     end
   end
 end
diff --git a/test/plugin/test_in_exec.rb b/test/plugin/test_in_exec.rb
index 33638af..9cd378f 100644
--- a/test/plugin/test_in_exec.rb
+++ b/test/plugin/test_in_exec.rb
@@ -6,8 +6,39 @@ class ExecInputTest < Test::Unit::TestCase
     Fluent::Test.setup
   end
 
-  test "failure" do
-    flunk
+  data(immediate: "")
+  data(run_interval: "run_interval 1")
+  test 'can handle non-ascii characters' do |additional_setting|
+    content = 'ひらがな漢字'
+
+    d = create_driver %[
+      command ruby -e "puts '#{content}'"
+      tag test
+      encoding utf-8
+      <parse>
+        @type none
+      </parse>
+      #{additional_setting}
+    ]
+
+    d.run(expect_records: 1, timeout: 10)
+
+    assert_equal 1, d.events.length
+    tag, time, record = d.events.first
+    assert_equal({"message" => content}, record)
+  end
+
+  test 'raise ConfigError for invalid encoding' do
+    assert_raise Fluent::ConfigError do
+      d = create_driver %[
+        command ruby -e "puts foo"
+        tag test
+        encoding invalid-encode
+        <parse>
+          @type none
+        </parse>
+      ]
+    end
   end
 
   private