testcases/kernel/device-drivers/include/userBlockInclude.c

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/kd.h>
#include <linux/errno.h>

#include "includeTest.h"

int open_block_device(void);

int block_dev_handle = 0;      /* handle to INC test block device */

int main(int argc, char **argv)
{

    incdev_cmd_t  cmd = {0,0};
    int rc;

    rc = open_block_device();

    if (!rc) {

        block_dev_handle = open(DEVICE_NAME, O_RDWR);

        if (block_dev_handle < 0) {
            printf("ERROR: Open of device %s failed %d errno = %d\n",
		DEVICE_NAME,block_dev_handle, errno);
        }
        else {
            rc = ioctl (block_dev_handle, INCDEV_CMD, &cmd);

            printf("return from ioctl %d \n", rc);
        }

    } else {
        printf("ERROR: Create/open block device failed\n");
    }

  return 0;

    printf("Block Include Test complete.\n");
}

int open_block_device()
{
    dev_t devt;
    struct stat statbuf;
    int rc;

    if (block_dev_handle == 0) {

        /* check for the /dev/ subdir, and create if it does not exist.
         *
         * If devfs is running and mounted on /dev, these checks will all pass,
         * so a new node will not be created.
         */

        devt = makedev(INCLUDEMAJOR, 0);

        rc = stat(INCLUDE_DEVICE_PATH, &statbuf);

	if (rc) {
            if (errno == ENOENT) {
                /* dev node does not exist. */
                rc = mkdir(INCLUDE_DEVICE_PATH, (S_IFDIR | S_IRWXU |
                                                    S_IRGRP | S_IXGRP |
                                                    S_IROTH | S_IXOTH));

            } else {
                printf("ERROR: Problem with INC dev directory.  Error code from stat(
			) is %d\n\n", errno);
            }
        } else {
	    if (!(statbuf.st_mode & S_IFDIR)) {
                rc = unlink(INCLUDE_DEVICE_PATH);
	        if (!rc) {
	             rc = mkdir(INCLUDE_DEVICE_PATH, (S_IFDIR | S_IRWXU |
                                                    S_IRGRP | S_IXGRP |
                                                    S_IROTH | S_IXOTH));
                }
            }
        }

	/*
         * Check for the block_device node, and create if it does not
         * exist.
         */

        rc = stat(DEVICE_NAME, &statbuf);
        if (rc) {
	    if (errno == ENOENT) {
                /* dev node does not exist */
                rc = mknod(DEVICE_NAME, (S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP), devt);
            } else {
                printf("ERROR:Problem with block device node directory.  Error code form stat() is %d\n\n", errno);
            }

         } else {
	    /*
             * Device exists. Check to make sure it is for a
             * block device and that it has the right major and minor.
             */

            if ((!(statbuf.st_mode & S_IFBLK)) ||
                 (statbuf.st_rdev != devt)) {
                /* Recreate the dev node. */
                rc = unlink(DEVICE_NAME);
                if (!rc) {
                    rc = mknod(DEVICE_NAME, (S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP), devt);
                }
            }
        }

    }
    return rc;
}