Thread: compiling c prog with outb function

Hi there,

i'm trying to write an extremely simple program that writes to the parallel port:

Code:

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/parport.h>
#include <linux/ppdev.h>


#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
  int addr = 0x378;
  int result = ioperm(addr,5,1);

  outb(0xff, addr);

  return EXIT_SUCCESS;
}

The problem is when i compile it it tells me i have a undefined reference to the outb function. The man pages tell me that i need to include option -O# to compile my program. I use:

Code:

gcc -O2 ./main.c -o main.o -lm

which spits out:

Code:

/tmp/ccW9TX56.o: In function `main':
main.c:(.text+0x31): undefined reference to `outb'
collect2: ld returned 1 exit status

what am i doing wrong, am i missing an include file or something?

thanks

You are at linux right? Googling I found this http://ou800doc.caldera.com/en/man/html.D3/outb.D3.html which have some header files to include

i've allready been to that site, adding the includes adds some new errors:

Code:

./main.c:11:21: error: sys/ddi.h: No such file or directory
./main.c:12:23: error: sys/f_ddi.h: No such file or directory

once again i was compiling with:

Code:

gcc -O2 ./main.c -o main.o -lm

doing a search on my computer for these 2 files returns nothing, as far as i know i have all the development libraries installed, are there any specific ones i should know about. Also running outb() from my terminal works.

what should i be using then?

thanks.