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# # shell/system-command.rb - # $Release Version: 0.7 $ # $Revision: 46969 $ # by Keiju ISHITSUKA(keiju@ruby-lang.org) # # -- # # # require "shell/filter" class Shell class SystemCommand < Filter def initialize(sh, command, *opts) if t = opts.find{|opt| !opt.kind_of?(String) && opt.class} Shell.Fail Error::TypeError, t.class, "String" end super(sh) @command = command @opts = opts @input_queue = Queue.new @pid = nil sh.process_controller.add_schedule(self) end attr_reader :command alias name command def wait? @shell.process_controller.waiting_job?(self) end def active? @shell.process_controller.active_job?(self) end def input=(inp) super if active? start_export end end def start notify([@command, *@opts].join(" ")) @pid, @pipe_in, @pipe_out = @shell.process_controller.sfork(self) { Dir.chdir @shell.pwd $0 = @command exec(@command, *@opts) } if @input start_export end start_import end def flush @pipe_out.flush if @pipe_out and !@pipe_out.closed? end def terminate begin @pipe_in.close rescue IOError end begin @pipe_out.close rescue IOError end end def kill(sig) if @pid Process.kill(sig, @pid) end end def start_import notify "Job(%id) start imp-pipe.", @shell.debug? _eop = true Thread.start { begin while l = @pipe_in.gets @input_queue.push l end _eop = false rescue Errno::EPIPE _eop = false ensure if !ProcessController::USING_AT_EXIT_WHEN_PROCESS_EXIT and _eop notify("warn: Process finishing...", "wait for Job[%id] to finish pipe importing.", "You can use Shell#transact or Shell#check_point for more safe execution.") redo end notify "job(%id}) close imp-pipe.", @shell.debug? @input_queue.push :EOF @pipe_in.close end } end def start_export notify "job(%id) start exp-pipe.", @shell.debug? _eop = true Thread.start{ begin @input.each do |l| ProcessController::block_output_synchronize do @pipe_out.print l end end _eop = false rescue Errno::EPIPE, Errno::EIO _eop = false ensure if !ProcessController::USING_AT_EXIT_WHEN_PROCESS_EXIT and _eop notify("shell: warn: Process finishing...", "wait for Job(%id) to finish pipe exporting.", "You can use Shell#transact or Shell#check_point for more safe execution.") redo end notify "job(%id) close exp-pipe.", @shell.debug? @pipe_out.close end } end alias super_each each def each(rs = nil) while (l = @input_queue.pop) != :EOF yield l end end # ex) # if you wish to output: # "shell: job(#{@command}:#{@pid}) close pipe-out." # then # mes: "job(%id) close pipe-out." # yorn: Boolean(@shell.debug? or @shell.verbose?) def notify(*opts) @shell.notify(*opts) do |mes| yield mes if iterator? mes.gsub!("%id", "#{@command}:##{@pid}") mes.gsub!("%name", "#{@command}") mes.gsub!("%pid", "#{@pid}") mes end end end end
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