source: mainline/kernel/generic/src/ipc/ops/conctmeto.c

/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * Copyright (c) 2012 Jakub Jermar
 * 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup kernel_generic_ipc
 * @{
 */
/** @file
 */

#include <ipc/sysipc_ops.h>
#include <ipc/ipc.h>
#include <ipc/ipcrsc.h>
#include <abi/errno.h>
#include <arch.h>

static errno_t request_preprocess(call_t *call, phone_t *phone)
{
        /*
         * Create the new phone and capability, but don't publish them yet.
         * That will be done once the phone is connected.
         */
        cap_phone_handle_t phandle;
        kobject_t *pobj;
        errno_t rc = phone_alloc(TASK, false, &phandle, &pobj);
        if (rc != EOK) {
                call->priv = 0;
                return rc;
        }

        /* Move pobj's reference to call->priv */
        call->priv = (sysarg_t) pobj;
        pobj = NULL;

        /* Remember the handle */
        ipc_set_arg5(&call->data, (sysarg_t) phandle);

        return EOK;
}

static errno_t request_forget(call_t *call)
{
        cap_phone_handle_t phandle = (cap_handle_t) ipc_get_arg5(&call->data);

        if (cap_handle_raw(phandle) < 0)
                return EOK;

        /* Move reference from call->priv to pobj */
        kobject_t *pobj = (kobject_t *) call->priv;
        call->priv = 0;
        /* Drop pobj's reference */
        kobject_put(pobj);
        cap_free(TASK, phandle);

        return EOK;
}

static errno_t answer_preprocess(call_t *answer, ipc_data_t *olddata)
{
        /* Get an extra reference for phone */
        kobject_t *pobj = (kobject_t *) answer->priv;
        kobject_add_ref(pobj);

        /* Set the recipient-assigned label */
        pobj->phone->label = ipc_get_arg5(&answer->data);

        /* Restore phone handle in answer's ARG5 */
        ipc_set_arg5(&answer->data, ipc_get_arg5(olddata));

        /* If the user accepted the call, connect */
        if (ipc_get_retval(&answer->data) == EOK) {
                /* Hand over reference from pobj to the answerbox */
                (void) ipc_phone_connect(pobj->phone, &TASK->answerbox);
        } else {
                /* Drop the extra reference */
                kobject_put(pobj);
        }

        return EOK;
}

static errno_t answer_process(call_t *answer)
{
        cap_phone_handle_t phandle = (cap_handle_t) ipc_get_arg5(&answer->data);
        /* Move the reference from answer->priv to pobj */
        kobject_t *pobj = (kobject_t *) answer->priv;
        answer->priv = 0;

        if (ipc_get_retval(&answer->data)) {
                if (cap_handle_raw(phandle) >= 0) {
                        /*
                         * Cleanup the unpublished capability and drop
                         * phone->kobject's reference.
                         */
                        kobject_put(pobj);
                        cap_free(TASK, phandle);
                }
        } else {
                /*
                 * Publish the capability. Publishing the capability this late
                 * is important for ipc_cleanup() where we want to have a
                 * capability for each phone that wasn't hung up by the user.
                 */
                cap_publish(TASK, phandle, pobj);
        }

        return EOK;
}

sysipc_ops_t ipc_m_connect_me_to_ops = {
        .request_preprocess = request_preprocess,
        .request_forget = request_forget,
        .request_process = null_request_process,
        .answer_cleanup = null_answer_cleanup,
        .answer_preprocess = answer_preprocess,
        .answer_process = answer_process,
};

/** @}
 */