config root man

/* 08 Nov 1998*/
/*
 * testmisc.c
 *
 * Test program to call the sample loaded kld device driver.
 *
 * 05 Jun 93	Rajesh Vaidheeswarran		Original
 *
 *
 * Copyright (c) 1993 Rajesh Vaidheeswarran.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Rajesh Vaidheeswarran.
 * 4. The name Rajesh Vaidheeswarran may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY RAJESH VAIDHEESWARRAN ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE RAJESH VAIDHEESWARRAN BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Copyright (c) 1993 Terrence R. Lambert.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Terrence R. Lambert.
 * 4. The name Terrence R. Lambert may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *
 * $FreeBSD: release/9.1.0/share/examples/kld/cdev/test/testcdev.c 202603 2010-01-18 23:13:22Z wkoszek $
 */
#include <sys/types.h>
#include <sys/ioccom.h>

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <paths.h>
#include <string.h>
#include <unistd.h>

#define CDEV_IOCTL1     _IOR('C', 1, u_int)
#define CDEV_DEVICE	"cdev"

static char writestr[] = "Hello kernel!";
static char buf[512+1];

int
main(int argc __unused, char *argv[] __unused)
{
    int kernel_fd;
    int one;
    int len;

    if ((kernel_fd = open("/dev/" CDEV_DEVICE, O_RDWR)) == -1) {
	perror("/dev/" CDEV_DEVICE);
	exit(1);
    }

    /* Send ioctl */
    if (ioctl(kernel_fd, CDEV_IOCTL1, &one) == -1) {
	perror("CDEV_IOCTL1");
    } else {
	printf( "Sent ioctl CDEV_IOCTL1 to device %s%s\n", _PATH_DEV, CDEV_DEVICE);
    }

    len = strlen(writestr) + 1;

    /* Write operation */
    if (write(kernel_fd, writestr, len) == -1) {
	perror("write()");
    } else {
	printf("Written \"%s\" string to device /dev/" CDEV_DEVICE "\n", writestr);
    }

    /* Read operation */
    if (read(kernel_fd, buf, len) == -1) {
	perror("read()");
    } else {
	printf("Read \"%s\" string from device /dev/" CDEV_DEVICE "\n", buf);
    }

    exit(0);
}