[Gambas-user] Writing to sysfs

[Rolf Schmidt]

Am Mittwoch, 9. April 2008 schrieb Andrew Barr:

Are you allowed to do that? I.e. does the programm run with admin rights? 
Usually writing to sysfs entries is only allowed for the admin (root).

> I am writing a control panel for Thinkpad laptops that basically acts as a
> graphical front end to the tp_smapi driver. It allows the user to display
> information about installed batteries and set some vendor-specific
> settings, such as threshold percentages to start/stop charging at. To do
> this, the program must read and write to nodes in sysfs. I have had no
> problem reading from sysfs using the OPEN and LINE INPUT statements, but I
> am encountering an invalid argument error when using OPEN and WRITE or
> PRINT to write the user's preferences to sysfs. Normally, this sort of
> thing is done by way of the 'echo' command, for example:
>
> # echo 0 > /sys/devices/platform/smapi/BAT0/force_discharge
>
> would disable forced discharging of the battery. Permissions are correct
> for the user that the GUI program is running under, and I can confirm by
> use of the '-n' switch to echo that the carriage return being there or not
> makes no difference to either Gambas or the sysfs interface.
>
> Ideas, anyone?


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