From: Takaaki Tateishi <ttate@...>
Date: 2000-10-23T16:15:35+09:00
Subject: [ruby-list:25581] Re: open3.rb

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立石です．

At Sun, 22 Oct 2000 01:47:47 +0900,
nobu.nakada@nifty.ne.jp wrote:
> > ついでに，ブロック付きで呼ばれたときには抜けるときにclose
> > もやって欲しいなと思うのですがどうでしょうか?
> 
>   ついでに引数を exec と揃えたりってのはどうでしょう。
> Index: open3.rb
> ===================================================================
> RCS file: /home/cvs/ruby/lib/open3.rb,v
> retrieving revision 1.4
> diff -u -2 -p -r1.4 open3.rb

'_exit'と'waitpidの引数'がちょっと変でしたのでそこだけ修正
してmod_ruby使用時にゾンビが残らないことを確認しました．
--
Takaaki Tateishi <ttate@jaist.ac.jp>




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# Usage:
#	require "open3"
#
#	in, out, err = Open3.popen3('nroff -man')
#  or
#	include Open3
#	in, out, err = popen3('nroff -man')
#

module Open3
  #[stdin, stdout, stderr] = popen3(command);
  def popen3(*cmd)
    pw = IO::pipe   # pipe[0] for read, pipe[1] for write
    pr = IO::pipe
    pe = IO::pipe

    pid = fork{
      # child
      fork and exit!

      pw[1].close
      STDIN.reopen(pw[0])
      pw[0].close

      pr[0].close
      STDOUT.reopen(pr[1])
      pr[1].close

      pe[0].close
      STDERR.reopen(pe[1])
      pe[1].close

      exec(*cmd)
      exit! 127
    }

    pw[0].close
    pr[1].close
    pe[1].close
    Process.waitpid(pid,0)
    pi = [ pw[1], pr[0], pe[0] ]
    if defined? yield
      begin
	return yield *pi
      ensure
	pi.each {|p| p.closed? or p.close}
      end
    end
    pi
  end
  module_function :popen3
end

if $0 == __FILE__
  a = Open3.popen3("nroff -man")
  Thread.start do
    while line = gets
      a[0].print line
    end
    a[0].close
  end
  while line = a[1].gets
    print ":", line
  end
end

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