/* iobitmap.c
 *   Trival test program for checking the functioning of the x86 ioport bitmap.
 *
 *   Copyright 2002 Red Hat, Inc.  Written by Benjamin LaHaise.
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License along
 *   with this program; if not, write to the Free Software Foundation, Inc.,
 *   59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/io.h>
#include <errno.h>
#include <stdio.h>

int main (void)
{
	pid_t pid;
	int val, status = 0;
	if (ioperm(0x80, 0x80, 1)) {
		perror("ioperm(0x80, 0x80, 1) failed");
		return 1;
	}
	val = inb(0x80);
	printf("read 0x%02x from io port.  okay.\n", val);

	pid = fork();
	if (-1 == pid) {
		perror("fork failed");
		return 1;
	}

	if (0 == pid) {
		val = inb(0x80);
		printf("child read 0x%02x from io port.  okay.\n", val);
		return 0;
	}

	if (-1 == waitpid(pid, &status, 0)) {
		perror("waitpid failed");
		return 1;
	}

	if (WIFEXITED(status)) {
		printf("child exited with status %d\n", WEXITSTATUS(status));
		return WEXITSTATUS(status) == 0 ? 0 : 1;
	}

	printf("unknown exit status 0x%04x\n", status);
	
	return 1;
}