Date: Wed, 22 Sep 2004 15:51:45 +0300 (EEST) From: Jari Kirma <kirma@cs.hut.fi> To: freebsd-hackers@freebsd.org Subject: Re: execute a user process in the kernel Message-ID: <Pine.GSO.4.61.0409221542280.29838@hutcs.cs.hut.fi>
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Gordon David wrote:
> Hello,
> I have a question. Anyone would like to tell me how to execute a user
> process or shell script in the kernel?
> As we know, the kernel forks a process named initproc and executes
> /sbin/init, etc. If I want to execute a user level process, such as a
> simple printf("Hello world") in a driver, what shall I do?
Proper way to do this is to have userland daemon handling this stuff,
waiting for device driver using device-specific method (most likely
a file under /dev). I'm pretty skeptic processes that don't have init
process as their first ancestor can be created easily at all.
There's also another question to consider: where the output should go?
These kind of things are better to be handled in the userland.
-kirma
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