From: Jan Koprowski <Jan.Koprowski@...>
Date: 2007-12-06T17:41:07+09:00
Subject: Re: Using popen with 0,1,2,3,4 streams

On 4 Gru, 17:58, Tim Pease <tim.pe...@gmail.com> wrote:
> On Dec 3, 2007 5:32 PM, Judson Lester <nya...@gmail.com> wrote:
>
>
>
> > Jan,
>
> > You might look at popen3 in the standard library.  I don't think it quite
> > does what you need (since it returns an array if three pipes: stdin, stdout
> > and stderr for the subprocess) but the code is short if a little arcane, and
> > might point you in the right direction to figure this out.
>
> > Judson
>
> > On Dec 2, 2007 3:10 AM, Jan Koprowski <Jan.Koprow...@gmail.com> wrote:
>
> > > Hi !
>
> > >   I try to run command system and get streams handlers to 0 (stdin),
> > > 1(stdout), 2(stderr), 3(myOwnStdIn1), 4(myOwnStdIn2). I do something
> > > like that in PHP by proc_open and table of pipes, but here I don't
> > > know how I can get handlers to process streams. I know that this code
> > > is bad but I think something like this:
>
> > > process =popen('command', 'w+');
> > > stdin = process.new(0, "w");
> > > stdout = process.new(1, "r");
>
> > > etc...
>
> > > But new is a static method. What i should to do ?
>
> Also take a look at open4 and systemu. You can find both at the
> codeforpeople project on RubyForge. They, too, will offer some good
> insight on what you want to do, though neither does precisely what you
> need.
>
> <http://rubyforge.org/projects/codeforpeople>
>
> Blessings,
> TwP

U try to write something like this:

#
# To change this template, choose Tools | Templates
# and open the template in the editor.
require 'fcntl'
require 'timeout'
require 'thread'

class Broker_process3

  READ = 0  # Consts to explicite mark read
  WRITE = 1 # and write pipes
  @stdin
  @stdout
  @stderr

  def initialize

  end

  def self.run (command, params)
    pw, pr, pe, pl, pp = IO.pipe, IO.pipe, IO.pipe, IO.pipe, IO.pipe
    pl.last.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
    pp.last.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)

    pid = fork {
      pw.last.close
      STDIN.reopen pw.first
      pw.first.close

      pr.first.close
      STDOUT.reopen pr.last
      pr.last.close

      pe.first.close
      STDERR.reopen pe.last
      pe.last.close

      pl.last.close
      pp.last.close

      STDOUT.sync = STDERR.sync = true

      exec(*command)
    }

    [pw.first, pr.last, pe.last, pl.first, pp.first].each{|fd|
fd.close}

    pl.last.write("login"); // ERROR HERE
    pl.last.close
    pp.last.write("hasło");
    pp.last.close

    pw.last.close
    out = pr.first.readlines
    pr.first.close
    pe.first.close
    puts out;
  end
end

but in // ERROR HERE I get:

./broker_process3.rb:48:in `write': Broken pipe (Errno::EPIPE)
        from ./broker_process3.rb:48:in `run'
        from /home/johny/NetBeansProjects/zhradmin/lib/main.rb:12