Detect that a child is waiting for input

[Shachar Shemesh via Digitalmars-d]

You can detect whether another process received a signal by ptracing it. 
If you are only ptracing for signals, then the performance penalty 
shouldn't be too severe.

Shachar

On 24/11/16 12:35, unDEFER wrote:
> On Wednesday, 23 November 2016 at 07:18:27 UTC, Shachar Shemesh wrote:
>
>> The shell does that for background processes. I think it takes away
>> the TTY from its children, and this way, when they try to read from
>> stdin, they get SIGSTOP from the system.
>>
>> I'm not sure what the precise mechanism is.
>>
>> There are flags passed to wait which will cause it to report when a
>> child gets SIGSTOP.
>>
>> Hope this helps,
>> Shachar
>
> So, I have found with strace, this signal is SIGTTIN is special signal
> which sends to _background_ task when it tries to read from terminal.
>
> So it is possible such detect when I will write not simple pipeProcess,
> but will write terminal emulator.
> Thank you.