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Re: Question about writing and reading from a PTY

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On Saturday, January 14, 2017 at 12:33:04 PM UTC-7, Chad Woolley wrote:
> Hello,
> 
> I'm trying to understand PTY behavior (I'm using Ruby 2.3.3).  
> 
> Specifically, in line 86 of this example (which should be executable if downloaded), why does the command not behave the same way via PTY as it does from a real terminal (which is to echo '>a<' or '>z<' to STDOUT)?
> 
> https://gist.github.com/thewoolleyman/6a060574f22eafd42955812a1a2a7842/37491a2c756aa066444626294d65ab9208c95c7c#file-pty_check_test-rb-L86  
> 

Figured this out myself.  I wasn't reading the CR+LF chars appended by the 'puts' in the cmd.  Fixed by adding a loop to ensure I read all chars (with the help of IO::ready? in 'io/wait' module).

Here's the working version and output:

https://gist.github.com/thewoolleyman/6a060574f22eafd42955812a1a2a7842/c76e0c62253c85033e73892319404eb9a40ab3e6#file-pty_check_test-rb-L42

https://gist.github.com/thewoolleyman/6a060574f22eafd42955812a1a2a7842/c76e0c62253c85033e73892319404eb9a40ab3e6#file-output-txt

-- Chad

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Question about writing and reading from a PTY Chad Woolley <thewoolleyman@gmail.com> - 2017-01-14 11:32 -0800
  Re: Question about writing and reading from a PTY Chad Woolley <thewoolleyman@gmail.com> - 2017-01-15 20:06 -0800

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