Archipelago » blktap-utils

/*

 * Copyright (c) 2008, XenSource Inc.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * 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.

 *     * Neither the name of XenSource Inc. nor the names of its contributors

 *       may be used to endorse or promote products derived from this software

 *       without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "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 COPYRIGHT OWNER

 * OR CONTRIBUTORS 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdio.h>

#include <errno.h>

#include <unistd.h>

#include <string.h>

#include "tap-ctl.h"

#include "blktap2.h"

int

tap_ctl_check_blktap(const char **msg)

{

        FILE *f;

        int err = 0, minor;

        char name[32];

        memset(name, 0, sizeof(name));

        f = fopen("/proc/misc", "r");

        if (!f) {

                *msg = "failed to open /proc/misc";

                return -errno;

        }

        while (fscanf(f, "%d %32s", &minor, name) == 2) {

                if (!strcmp(name, BLKTAP2_CONTROL_NAME))

                        goto out;

        }

        err = -ENOSYS;

        *msg = "blktap kernel module not installed";

out:

        fclose(f);

        return err;

}

int

tap_ctl_check(const char **msg)

{

        int err;

        err = tap_ctl_check_blktap(msg);

        if (err)

                goto out;

        err  = 0;

        *msg = "ok";

out:

        return err;

}