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Re: How do I Use call_usermodehelper/exec_usermodehelper ?

On Tue, Dec 02, 2003 at 07:25:33PM +0000, Peter Smith wrote:
> Hi,
> 
> I have a working kernel module which I would like to
> execute a Bash script under certain conditions. I`ve
> spent hours and hours and hours looking for a simple
> way to do this. Eventually I came across the commands
> "exec_usermodehelper" and "call_usermodehelper".
> However I cannot find any tutorials covering these
> commands and the only source code I have is "kmod.c"
> from the kernel (not detailed or simple enough for a
> newbie like me). Could someone please provide a
> _simple_ worked example of how to use these commands
> e.g. show me how to execute a Bash script from a
> kernel module. Any help will be much appreciated.

In 2.4 see:
	drivers/usb/usb.c::call_policy_interface()

In 2.6 see:
	lib/kobject.c::kset_hotplug()

Hope this helps.

greg k-h
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