Re: why does NSTask setpgrp on sub processes?

[Richard Frith-Macdonald]

On 20 Jan 2010, at 06:14, Derek Zhou wrote:

> 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 don't know.

Can you provide a test program which will check the behavior of NSTask on OSX?

>> 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.

We should try to do whatever OSX does (for compatibility).