From: Robert Klemme <shortcutter@...>
Date: 2009-12-30T05:19:16+09:00
Subject: Re: IO.popen('-') === fork ?

2009/12/29 Nilez Parker <dcparker@gmail.com>:
> I just want to know if the following two are technically equivalent
> (calling fork(2) in UNIX environments):
>
> ##########
>
> IO.popen('-') {|io|
>  ...
> }
>
> #---------
>
> fork do
>  ...
> end
>
> ##########
>
> As much explanation you want to give will be appreciated, I will soak it
> all up. Thanks ahead. :)

fork does nothing to redirect stdin, stdout and stderr while popen in
the form you used will send the sub process's stdout to a pipe.  So
the answer is: no, they are not equivalent.  Rather popen uses some
form of fork under the hood.

Kind regards

robert


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