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Re: Retrieving process information without using ps

Terry Lambert writes:
> On Aug 2, 2006, at 1:01 PM, Greg Parker wrote:
>> Terry Lambert wrote:
>>> (1) fork
>>>
>>> (2) obtain the task port in the child, prior to execve (the child has
>>> self rights)
>>>
>>> (3) send the port from the child to the parent process (the parent  
>>> can
>>> then use the port)
>>
>> How does this part work? I can't figure out how to get a communication
>> channel from the child to the parent that can transfer a port right.
> 
> You have to send it in a Mach message; specifically, access rights to  
> a port are granted to a task by sending a "send right" or "receive  
> right" message to the task you want to be able to use the port; 

Yes, I understand that. But how does the child send a Mach message 
to the parent? How does it get a send right for a port for which the parent 
owns the receive right? As far as I can tell, the child doesn't have the 
parent's task port, nor any other port the parent had before fork().


-- 
Greg Parker     email@hidden
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 >Re: Retrieving process information without using ps (From: Terry Lambert <email@hidden>)



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