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Re: Retrieving process information without using ps


On Aug 2, 2006, at 3:46 PM, Greg Parker wrote:

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().

That's correct. At the Mach level, tasks don't *have* parent-child relationships (in the traditional Unix sense). So you have to advertise a port by registering a name for it. (It need not be a well- known name... You can pass it [the name] as a command-line argument to the "child" process.)

-- Kaelin

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



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