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Raspberry Pi
Forum Anyone know how to access RasPi GPIO without sudo?
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  • raspberry_pi
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Anyone know how to access RasPi GPIO without sudo?

johnbeetem
johnbeetem over 9 years ago

I've finally gotten around to playing with RasPi GPIOs, using Gert van Loo and Dom's C code at the RasPi Wiki.  It works fine, except that you have to run the executable as root or use sudo to access /dev/mem.

 

Does anyone here know how to access /dev/mem as a normal user?

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  • johnbeetem
    johnbeetem over 7 years ago in reply to Former Member +2

    Roger Wolff wrote:

     

    Now back to your problem...
    If you make a little program that allows you to manipulate just the GPIO outputs, that won't allow you to cause all the other mischief you'd be able to…

  • rew
    rew over 9 years ago in reply to Arjan +1 verified

    Unix has a "security model". As a normal users you can do stuff, but you should not be able to access other people's files on the same computer. And as a user you should not be able to cause the computer…

  • Former Member
    Former Member over 9 years ago in reply to Former Member +1 suggested

    Keith Chiem wrote:

     

    $ sudo chown pi /dev/mem

    That will not work.  As well as any access controls imposed by the filesystem, you also need to have capability CAP_SYS_RAWIO to open the /dev/mem device.  So you…

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  • Former Member
    0 Former Member over 9 years ago

    Not sure what you have against running as root--either via su, sudo $SHELL, or setuid--but you could try:

     

    $ sudo chown pi /dev/mem

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  • johnbeetem
    0 johnbeetem over 9 years ago in reply to Former Member

    Keith Chiem wrote:

     

    Not sure what you have against running as root--either via su, sudo $SHELL, or setuid--but you could try:

     

    $ sudo chown pi /dev/mem

    I like to run as a normal user most of the time so that I don't accidentally destroy system files.  I'll try your suggestion with /dev/mem, and if it doesn't work I'll take a closer look at permissions for /dev/mem.

     

    One think that's a bit different in my case is that I'm editing and running programs within the XXICC programming environment (xxicc.org).  I'm not generating a stand-alone GPIO program which I can then run using sudo.  I currently have to run XXICC using sudo, so I'm not protected form destroying system files.

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  • johnbeetem
    0 johnbeetem over 9 years ago in reply to Former Member

    Keith Chiem wrote:

     

    Not sure what you have against running as root--either via su, sudo $SHELL, or setuid--but you could try:

     

    $ sudo chown pi /dev/mem

    I like to run as a normal user most of the time so that I don't accidentally destroy system files.  I'll try your suggestion with /dev/mem, and if it doesn't work I'll take a closer look at permissions for /dev/mem.

     

    One think that's a bit different in my case is that I'm editing and running programs within the XXICC programming environment (xxicc.org).  I'm not generating a stand-alone GPIO program which I can then run using sudo.  I currently have to run XXICC using sudo, so I'm not protected form destroying system files.

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