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Date:	Sun, 11 May 2014 17:50:32 -0400
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Subject:	Re: detecting child processes?
From:	Matthew Petricone <strstream AT gmail DOT com>
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I would consider using a temp file with some data regarding the situation,
almost like a semaphore. You would have to be careful about error
situations with file io.

Matthew Petricone
Strstream AT gmail DOT com
Matt AT petricone DOT org
On May 11, 2014 3:30 PM, "Hans-Bernhard Br=C3=B6ker" <HBBroeker AT t-online DOT de=
>
wrote:

> On 11.05.2014 19:59, Rod Pemberton wrote:
>
>  I have a process which spawns a child of itself via system().
>>
>> Although the parent and child are the same application, I'd now
>> like the child to function slightly differently from the parent.
>>
>
> I'll assume you're referring only to the case where the parent process is
> this same program, rather than your program being invoked as any arbitrar=
y
> other program's child process.
>
>  To do that, I need to be able to detect that the child is not
>> the parent.
>>
>
> So make the parent _tell_ the child: set an environment variable like
> "PAPA_ALREADY_THERE", pass a command line argument to the child, or
> whatever you like.
>

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<p dir=3D"ltr">I would consider using a temp file with some data regarding =
the situation, almost like a semaphore. You would have to be careful about =
error situations with file io.</p>
<p dir=3D"ltr">Matthew Petricone<br>
<a href=3D"mailto:Strstream AT gmail DOT com">Strstream AT gmail DOT com</a><br>
<a href=3D"mailto:Matt AT petricone DOT org">Matt AT petricone DOT org</a></p>
<div class=3D"gmail_quote">On May 11, 2014 3:30 PM, &quot;Hans-Bernhard Br=
=C3=B6ker&quot; &lt;<a href=3D"mailto:HBBroeker AT t-online DOT de">HBBroeker AT t-on=
line.de</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x">
On 11.05.2014 19:59, Rod Pemberton wrote:<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
I have a process which spawns a child of itself via system().<br>
<br>
Although the parent and child are the same application, I&#39;d now<br>
like the child to function slightly differently from the parent.<br>
</blockquote>
<br>
I&#39;ll assume you&#39;re referring only to the case where the parent proc=
ess is this same program, rather than your program being invoked as any arb=
itrary other program&#39;s child process.<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
To do that, I need to be able to detect that the child is not<br>
the parent.<br>
</blockquote>
<br>
So make the parent _tell_ the child: set an environment variable like &quot=
;PAPA_ALREADY_THERE&quot;, pass a command line argument to the child, or wh=
atever you like.<br>
</blockquote></div>

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