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Re: why does NSTask setpgrp on sub processes?


From: Derek Zhou
Subject: Re: why does NSTask setpgrp on sub processes?
Date: Tue, 19 Jan 2010 22:14:15 -0800
User-agent: KMail/1.12.4 (Linux/2.6.31; KDE/4.3.4; i686; ; )

On Tuesday 19 January 2010 12:59:28 am Derek Zhou wrote:
> hi all,
> it seems NSTask setpgrp after the fork:
> ...
>       /*                                                                      
>   
>        * Make sure task is run in it's own process group.                     
>   
>        */
> #ifdef     HAVE_SETPGRP
> #ifdef  SETPGRP_VOID
>       setpgrp();
> #else
>       setpgrp(getpid(), getpid());
> #endif
> 
> Why is it doing that? Is it simply what Apple is doing?
> I am trying to call $EDITOR (normally a TTY process) in my program which has 
> no gui either. 
> However I suspect the setpgrp mess up the terminal setting so the EDITOR does 
> not have the tty. I can tcsetpgrp from my process but then my process is 
> stopped. Can we do this:
> 0, just don't setpgrp, or
> 1, don't setpgrp if the parent's stdin is a tty and not setting the child's 
> stdin, or
> 2, add an option not to setpgrp. (it is an additional API though)
> I think 1 is the safest route and I can easily make a patch. I can do either 
> 0 or 1 if that's what people want.
> 
Moving to the dev list. 
Derek




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