From: Tim Pease <tim.pease@...>
Date: 2007-08-12T09:38:35+09:00
Subject: Re: pipelining

On 8/11/07, Fara Nasr <faranak_code000@yahoo.com> wrote:
> Hello everyone
>
> I urgently some help with this code. I am trying to implement the
> following pipeline and i keep getting this error Erro:ENOENT
> can anybody please help me to get this code working
>

The error is most likely coming from the "exec" command in the forked
child process. It's telling you that one of your commands does not
exist.

Can you post the full error message? That might give some more insight
and a better answer (this is just my best guess).

Blessings,
TwP

PS  In your child, call exit! instead of just plain exit. exit! will
prevent the at_exit routines from running and killing file descriptors
in the parent. See the documentation on fork for more details.


>
>  #input is the command line
> def handleCommandLine(input)
>       # it splits the pipeline into an array
>       command = input.split('|').map{|c|word_list(c)}
>        i = 0
>        while i< command.length
>     commands = command.at(i)
>           execute(commands)
>     i +=1
>      end
>      end
>
>    def execute(commands)
>     rd, wr = IO.pipe
>     if fork.nil?
>     # child
>     rd.close
>     $stdout.reopen(wr)
>     wr.close
>     exec(*commands)
>     exit
>     else
>     # parent
>      wr.close
>     $stdin.reopen(rd)
>      rd.close
>                  end
>   end
> --
> Posted via http://www.ruby-forum.com/.
>
>