El Fri, Apr 22, 2011 at 07:57:17AM -0700 ImperatorRj ha dit:
> On Apr 20, 8:15 pm, Shanth Murthy <[email protected]> wrote:
>
> > I have a question related to Android System Service.
> >
> > I have added system service into Android framework..
> >
> > During the run-time of the system service, it has to modify certain sysfs
> > parameter exposed by underlying device driver to achieve the required
> > functionality.
> > Native method is used to modify the sysfs parameter.
> >
> > Given the fact that, usually sysfs interface parameters are modified by root
> > user only, and system services don't have root permission. how do we tackle
> > this problem?
> >
> > Any pointer or suggestions would be highly appreciated.
>
> You could modify the permissions either in init.rc if they are already
> created or in the driver that creates them by callying a user process
> with chown.
calling a user process from a driver doesn't sound like a good idea
(and is impossible afaik). sysfs attributes of builtin drivers should
already exist when init is running. attributes of dynamically loaded
modules can be modified by a script/program which is executed from
init after having loaded the module(s)
--
Matthias Kaehlcke
Embedded Linux Developer
Amsterdam
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respects and enhances the freedom of others
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