From: "Meng, Ted" <mengx@...>
Date: 2002-10-18T22:55:42+09:00
Subject: Re: fork and exec

Thanks Nobu, this makes sense.

-----Original Message-----
From: nobu.nokada@softhome.net [mailto:nobu.nokada@softhome.net]
Sent: Wednesday, October 16, 2002 10:22 PM
To: ruby-talk@ruby-lang.org
Subject: Re: fork and exec


Hi,

At Thu, 17 Oct 2002 08:26:09 +0900,
Meng, Ted <mengx@tvratings.com> wrote:
> system "mkfifo ttt"
> pid = fork
> exec ("cat < ttt") if pid.nil?

exec ("exec cat < ttt") if pid.nil?

> I would expect only one process the real "cat process", but apparently,
ruby
> spawned 
> a process and then a child process, which is the real one.

When you use redirection, ruby invokes /bin/sh and /bin/sh
forks to execute the command.

-- 
Nobu Nakada