Detect that a child is waiting for input

[John Colvin via Digitalmars-d]

On Sunday, 20 November 2016 at 12:21:19 UTC, unDEFER wrote:
> Hello!
> I'm using pipeProcess() to create a process:
>
> pipes = pipeProcess(["bash", "-c", BASH_COMMAND], 
> Redirect.stdin | Redirect.stdout | Redirect.stderr);
>
> Is it possible detect that the child is waiting for input on 
> stdin?
> I can't find decision even for C. I think it is impossible if 
> the child uses unblocking reading. But I want to detect 
> blocking reading.

If blocking is an error, you could close stdin and assuming the 
process checks the error codes correctly....