From: Robert Klemme <shortcutter@...>
Date: 2007-04-19T22:30:06+09:00
Subject: Re: Executing program from ruby

On 19.04.2007 15:21, Marcin Raczkowski wrote:
> Hello i know there are several ways to execute from within ruby
> but each one have their own problems:
> 
> `` doesn't check if command /programm runs at all!, also it blocks untill 
> command returns, no bi-directional comunication
> popen2,3,4 doesn't check if command exists at all ... it's not rising any 
> errors ... and happilly continues to run untill you try to write something to 
> pipe that leads to program that never even started
> 
> only system() checks if command runs but it also returns false when programs 
> starts but returns anything other then 0
> 
> does anyone know good way to check if command exists then run it, return pid 
> for monitoring purposes and allow bidirectional comunication, then check exit 
> status ?
> 
> open4 comes close to fulfilling all that but it doesn't rise (sample program 
> that tells you it'll doesn't eaither), not to mention compleate lack of 
> documentation.
> 
> any expirience with open4? help? pointers?
> mayby i'm simply missing some obvious way?

popen and its derivatives?

	robert