The example code I pasted earlier didn't compile, and I made a few changes.
/*
* iopl.c: very simple example of port I/O
*
* This code does nothing useful, just a port write, a pause,
* and a port read. Compile with `gcc -O2 iopl.c -o iopl.o',
* and run as root with `./iopl.o'.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/io.h>
#include <stdlib.h>
#define BASEPORT 0x378 /* lp1 */
int main()
{
/* Get access to the ports */
if (iopl(3)) {perror("iopl"); exit(1);}
/* Set the data signals (D0-7) of the port to all low (0) */
outb(0, BASEPORT);
/* Sleep for a while (100 ms) */
usleep(100000);
/* Read from the status port (BASE+1) and display the result */
printf("status: %d\n", inb(BASEPORT + 1));
/* We don't need the ports anymore */
if (iopl(3)) {perror("iopl"); exit(1);}
exit(0);
}
/* end of iopl.c */
I get this error:
iopl: Function not implemented
So I switch to ioperm() using this code:
/*
* ioperm.c: very simple example of port I/O
*
* This code does nothing useful, just a port write, a pause,
* and a port read. Compile with `gcc -O2 ioperm.c -o ioperm.o',
* and run as root with `./ioperm.o'.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/io.h>
#include <stdlib.h>
#define BASEPORT 0x378 /* lp1 */
int main()
{
/* Get access to the ports */
if (ioperm(BASEPORT, 3, 1)) {perror("ioperm"); exit(1);}
/* Set the data signals (D0-7) of the port to all low (0) */
outb(0, BASEPORT);
/* Sleep for a while (100 ms) */
usleep(100000);
/* Read from the status port (BASE+1) and display the result */
printf("status: %d\n", inb(BASEPORT + 1));
/* We don't need the ports anymore */
if (ioperm(BASEPORT, 3, 0)) {perror("ioperm"); exit(1);}
exit(0);
}
/* end of ioperm.c */
Then same thing except for ioperm:
ioperm: Function not implemented
Posting code here because I'm going to test this code on a Debian system.. Feel
free to try this out on your end.. I'll post my results in a second.
I don't mean to flood the mailing list btw!
Alec
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