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Re: question about mach ports and fork

On Jan 21, 2004, at 3:37 PM, Nathan T. Hjelm wrote:
about IOService, however. You can't just open a new IOKit service
connection in the child? This is sometimes impossible because the
parent was privileged and the child not (so I feel your pain).

I have tried to open a new connection to iokit with the child process by
calling IOCreateMasterPort again but I get the same result as when I
didn't.

What do you mean by this?

In your forked child, you have to obtain the new master port, then re-lookup
the device(s) you're interested in. You can't just get "a new master port".

As a general rule, you shouldn't expect to be able to do anything much
useful after forking unlesss you're sticking to the basic BSD/POSIX APIs;
as Jim's pointed out, most of the other frameworks depend on at-exec
initialisation that can't be successfully reproduced later.

If you know you haven't changed working directory, re-execing argv[0]
with a 'magic' argument is simple enough.

= Mike
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References: 
 >question about mach ports and fork (From: "Nathan T. Hjelm" <email@hidden>)
 >Re: question about mach ports and fork (From: Jim Magee <email@hidden>)
 >Re: question about mach ports and fork (From: "Nathan T. Hjelm" <email@hidden>)



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