Messages in this thread |  | | Date | Sun, 30 Sep 2001 12:29:17 -0700 | From | Ben Greear <> | Subject | Re: inb() and outb() |
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Belinda wrote: > > Hi, all > > I wrote a simple program with inb() and outb(). > However, it reports the segmentation error when > running it. > > The code follows as: > --------------------------------- > #include <asm/io.h> > > #define LPT 0x378 >
You need to add something like this in your main method before calling write_LPT.
See 'man ioperm' for more info..
if (ioperm(LPT, 3, 1)) { printf("Sorry, you were not able to gain access to the ports\n"); printf("You must be root to run this program\n"); exit(1); }
> void write_LPT(unsigned char byte) > { > outb(byte, LPT); > } > > int main() > { > write_LPT(LPT); > printf("Value:%c", inb(LPT)); > > } > ------------------------------------------------------ > > Thanks, > > Belinda > > __________________________________________________ > Do You Yahoo!? > Listen to your Yahoo! Mail messages from any phone. > http://phone.yahoo.com > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Ben Greear <greearb@candelatech.com> <Ben_Greear@excite.com> President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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