On Fri, 18 Jan 2002 18:20:18 Rahul Saxena wrote: >hi everyone, > >I was tryign to read/write bits to 0x378 I/O port, >using the ioperm() system call. >But this allows only the root to access.
I think you should explore better ways than directly allowing the users to access the port, like writing a device driver module. Not that I've ever done that, but I have this wariness for allowing users to access the hardware directly. That was the DOS way of doing it, right? > >HOw do normal users access the port? >i did read about SETUID(), but i dont really >understand how it works for me ?? # chown root:root <filename> # chmod a+sx <filename> > >does anyone have any pointers on this ?? > >Also i am trying to uderstand how ot access using read >and write. for that i would need to add the user as >part of the group, which can access /dev/port. > >How do i add myself to the group? i guess.. in that >case i wont be in my original group. > I really think it would be best if you do it the accepted way (I consiously avoided the word "right" :-). Normal users aren't supposed to be accessing I/O ports directly. Try going thru _Linux Device Drivers_ by O'Rilley Publications for enlightenment. > >Thanks for reading > >-rahul > -- Tahir Hashmi (VSE, NCST) http://tahirhashmi.scriptmania.com [EMAIL PROTECTED] We, the rest of humanity, wish GNU luck and Godspeed _______________________________________________ Meeting on 6th 4pm at IIT Mumbai. See http://www.ilug-bom.org.in/meet/ http://mm.ilug-bom.org.in/mailman/listinfo/linuxers
