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 <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <getopt.h>

#include "tap-ctl.h"

int

tap_ctl_open(const int id, const int minor, const char *params, int flags,

                const int prt_minor, const char *secondary)

{

        int err;

        tapdisk_message_t message;

        memset(&message, 0, sizeof(message));

        message.type = TAPDISK_MESSAGE_OPEN;

        message.cookie = minor;

        message.u.params.devnum = minor;

        message.u.params.prt_devnum = prt_minor;

        message.u.params.flags = flags;

        err = snprintf(message.u.params.path,

                       sizeof(message.u.params.path) - 1, "%s", params);

        if (err >= sizeof(message.u.params.path)) {

                EPRINTF("name too long\n");

                return ENAMETOOLONG;

        }

        if (secondary) {

                err = snprintf(message.u.params.secondary,

                               sizeof(message.u.params.secondary) - 1, "%s",

                               secondary);

                if (err >= sizeof(message.u.params.secondary)) {

                        EPRINTF("secondary image name too long\n");

                        return ENAMETOOLONG;

                }

        }

        err = tap_ctl_connect_send_and_receive(id, &message, NULL);

        if (err)

                return err;

        switch (message.type) {

        case TAPDISK_MESSAGE_OPEN_RSP:

                break;

        case TAPDISK_MESSAGE_ERROR:

                err = -message.u.response.error;

                EPRINTF("open failed, err %d\n", err);

                break;

        default:

                EPRINTF("got unexpected result '%s' from %d\n",

                        tapdisk_message_name(message.type), id);

                err = EINVAL;

        }

        return err;

}